diff --git a/src/Test/NodeTestCase.php b/src/Test/NodeTestCase.php
index 61080bd8e..e6a954948 100644
--- a/src/Test/NodeTestCase.php
+++ b/src/Test/NodeTestCase.php
@@ -53,7 +53,7 @@ abstract class NodeTestCase extends TestCase
 
     protected function getEnvironment()
     {
-        return $this->currentEnv = new Environment(new ArrayLoader([]));
+        return $this->currentEnv = new Environment(new ArrayLoader());
     }
 
     protected function getVariableGetter($name, $line = false)
diff --git a/tests/CompilerTest.php b/tests/CompilerTest.php
index a71ee093a..051edfeb2 100644
--- a/tests/CompilerTest.php
+++ b/tests/CompilerTest.php
@@ -14,13 +14,13 @@ namespace Twig\Tests;
 use PHPUnit\Framework\TestCase;
 use Twig\Compiler;
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 
 class CompilerTest extends TestCase
 {
     public function testReprNumericValueWithLocale()
     {
-        $compiler = new Compiler(new Environment($this->createMock(LoaderInterface::class)));
+        $compiler = new Compiler(new Environment(new ArrayLoader()));
 
         $locale = setlocale(\LC_NUMERIC, '0');
         if (false === $locale) {
diff --git a/tests/CustomExtensionTest.php b/tests/CustomExtensionTest.php
index 0a7ba12d2..a2ac0dbed 100644
--- a/tests/CustomExtensionTest.php
+++ b/tests/CustomExtensionTest.php
@@ -14,7 +14,7 @@ namespace Twig\Tests;
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Extension\ExtensionInterface;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 
 class CustomExtensionTest extends TestCase
 {
@@ -26,7 +26,7 @@ class CustomExtensionTest extends TestCase
         $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionMessage($expectedExceptionMessage);
 
-        $env = new Environment($this->createMock(LoaderInterface::class));
+        $env = new Environment(new ArrayLoader());
         $env->addExtension($extension);
         $env->getUnaryOperators();
     }
diff --git a/tests/EnvironmentTest.php b/tests/EnvironmentTest.php
index 4eb22036e..d2547e7b2 100644
--- a/tests/EnvironmentTest.php
+++ b/tests/EnvironmentTest.php
@@ -269,7 +269,7 @@ class EnvironmentTest extends TestCase
 
     public function testHasGetExtensionByClassName()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->addExtension($ext = new EnvironmentTest_Extension());
         $this->assertSame($ext, $twig->getExtension(EnvironmentTest_Extension::class));
         $this->assertSame($ext, $twig->getExtension(EnvironmentTest_Extension::class));
@@ -277,7 +277,7 @@ class EnvironmentTest extends TestCase
 
     public function testAddExtension()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->addExtension(new EnvironmentTest_Extension());
 
         $this->assertArrayHasKey('test', $twig->getTokenParsers());
@@ -314,7 +314,7 @@ class EnvironmentTest extends TestCase
         $this->expectException(\LogicException::class);
         $this->expectExceptionMessage('Unable to register extension "Twig\Tests\EnvironmentTest_Extension" as it is already registered.');
 
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
 
         $twig->addExtension(new EnvironmentTest_Extension());
         $twig->addExtension(new EnvironmentTest_Extension());
@@ -358,7 +358,7 @@ class EnvironmentTest extends TestCase
 
     public function testUndefinedFunctionCallback()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->registerUndefinedFunctionCallback(function (string $name) {
             if ('dynamic' === $name) {
                 return new TwigFunction('dynamic', function () { return 'dynamic'; });
@@ -374,7 +374,7 @@ class EnvironmentTest extends TestCase
 
     public function testUndefinedFilterCallback()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->registerUndefinedFilterCallback(function (string $name) {
             if ('dynamic' === $name) {
                 return new TwigFilter('dynamic', function () { return 'dynamic'; });
@@ -390,7 +390,7 @@ class EnvironmentTest extends TestCase
 
     public function testUndefinedTokenParserCallback()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->registerUndefinedTokenParserCallback(function (string $name) {
             if ('dynamic' === $name) {
                 $parser = $this->createMock(TokenParserInterface::class);
diff --git a/tests/ExpressionParserTest.php b/tests/ExpressionParserTest.php
index abf5ae3a8..8dd91ba67 100644
--- a/tests/ExpressionParserTest.php
+++ b/tests/ExpressionParserTest.php
@@ -14,7 +14,7 @@ namespace Twig\Tests;
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Error\SyntaxError;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\Expression\ArrayExpression;
 use Twig\Node\Expression\Binary\ConcatBinary;
 use Twig\Node\Expression\ConstantExpression;
@@ -31,7 +31,7 @@ class ExpressionParserTest extends TestCase
     {
         $this->expectException(SyntaxError::class);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
         $parser->parse($env->tokenize(new Source($template, 'index')));
     }
@@ -59,7 +59,7 @@ class ExpressionParserTest extends TestCase
      */
     public function testSequenceExpression($template, $expected)
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $stream = $env->tokenize($source = new Source($template, ''));
         $parser = new Parser($env);
         $expected->setSourceContext($source);
@@ -74,7 +74,7 @@ class ExpressionParserTest extends TestCase
     {
         $this->expectException(SyntaxError::class);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
         $parser->parse($env->tokenize(new Source($template, 'index')));
     }
@@ -200,7 +200,7 @@ class ExpressionParserTest extends TestCase
     {
         $this->expectException(SyntaxError::class);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false, 'optimizations' => 0]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false, 'optimizations' => 0]);
         $stream = $env->tokenize(new Source('{{ "a" "b" }}', 'index'));
         $parser = new Parser($env);
 
@@ -212,7 +212,7 @@ class ExpressionParserTest extends TestCase
      */
     public function testStringExpression($template, $expected)
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false, 'optimizations' => 0]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false, 'optimizations' => 0]);
         $stream = $env->tokenize($source = new Source($template, ''));
         $parser = new Parser($env);
         $expected->setSourceContext($source);
@@ -268,7 +268,7 @@ class ExpressionParserTest extends TestCase
     {
         $this->expectException(SyntaxError::class);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ foo.bar(name="Foo") }}', 'index')));
@@ -278,7 +278,7 @@ class ExpressionParserTest extends TestCase
     {
         $this->expectException(SyntaxError::class);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{% from _self import foo %}{% macro foo() %}{% endmacro %}{{ foo(name="Foo") }}', 'index')));
@@ -289,7 +289,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('An argument must be a name. Unexpected token "string" of value "a" ("name" expected) in "index" at line 1.');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{% macro foo("a") %}{% endmacro %}', 'index')));
@@ -303,7 +303,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('A default value for an argument must be a constant (a boolean, a string, a number, a sequence, or a mapping) in "index" at line 1');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source($template, 'index')));
@@ -322,7 +322,7 @@ class ExpressionParserTest extends TestCase
      */
     public function testMacroDefinitionSupportsConstantDefaultValues($template)
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source($template, 'index')));
@@ -350,7 +350,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "cycl" function. Did you mean "cycle" in "index" at line 1?');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ cycl() }}', 'index')));
@@ -361,7 +361,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "foobar" function in "index" at line 1.');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ foobar() }}', 'index')));
@@ -372,7 +372,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "lowe" filter. Did you mean "lower" in "index" at line 1?');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ 1|lowe }}', 'index')));
@@ -383,7 +383,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "foobar" filter in "index" at line 1.');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ 1|foobar }}', 'index')));
@@ -394,7 +394,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "nul" test. Did you mean "null" in "index" at line 1');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
         $stream = $env->tokenize(new Source('{{ 1 is nul }}', 'index'));
         $parser->parse($stream);
@@ -405,7 +405,7 @@ class ExpressionParserTest extends TestCase
         $this->expectException(SyntaxError::class);
         $this->expectExceptionMessage('Unknown "foobar" test in "index" at line 1.');
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
         $parser = new Parser($env);
 
         $parser->parse($env->tokenize(new Source('{{ 1 is foobar }}', 'index')));
diff --git a/tests/Extension/EscaperTest.php b/tests/Extension/EscaperTest.php
index e211677bf..4f7071840 100644
--- a/tests/Extension/EscaperTest.php
+++ b/tests/Extension/EscaperTest.php
@@ -14,7 +14,7 @@ namespace Twig\Tests;
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Extension\EscaperExtension;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Runtime\EscaperRuntime;
 
 class EscaperTest extends TestCase
@@ -26,7 +26,7 @@ class EscaperTest extends TestCase
      */
     public function testCustomEscaper($expected, $string, $strategy)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $escaperExt = $twig->getExtension(EscaperExtension::class);
         $escaperExt->setEscaper('foo', 'Twig\Tests\legacy_escaper');
         $this->assertSame($expected, $twig->getRuntime(EscaperRuntime::class)->escape($string, $strategy, 'ISO-8859-1'));
@@ -48,7 +48,7 @@ class EscaperTest extends TestCase
      */
     public function testCustomEscaperWithoutCallingSetEscaperRuntime($expected, $string, $strategy)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $escaperExt = $twig->getExtension(EscaperExtension::class);
         $escaperExt->setEscaper('foo', 'Twig\Tests\legacy_escaper');
         $this->assertSame($expected, $twig->getRuntime(EscaperRuntime::class)->escape($string, $strategy, 'ISO-8859-1'));
@@ -59,11 +59,11 @@ class EscaperTest extends TestCase
      */
     public function testCustomEscapersOnMultipleEnvs()
     {
-        $env1 = new Environment($this->createMock(LoaderInterface::class));
+        $env1 = new Environment(new ArrayLoader());
         $escaperExt1 = $env1->getExtension(EscaperExtension::class);
         $escaperExt1->setEscaper('foo', 'Twig\Tests\legacy_escaper');
 
-        $env2 = new Environment($this->createMock(LoaderInterface::class));
+        $env2 = new Environment(new ArrayLoader());
         $escaperExt2 = $env2->getExtension(EscaperExtension::class);
         $escaperExt2->setEscaper('foo', 'Twig\Tests\legacy_escaper_again');
 
diff --git a/tests/Extension/StringLoaderExtensionTest.php b/tests/Extension/StringLoaderExtensionTest.php
index 4c67e12c7..d37b8f263 100644
--- a/tests/Extension/StringLoaderExtensionTest.php
+++ b/tests/Extension/StringLoaderExtensionTest.php
@@ -15,12 +15,13 @@ use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Extension\CoreExtension;
 use Twig\Extension\StringLoaderExtension;
+use Twig\Loader\ArrayLoader;
 
 class StringLoaderExtensionTest extends TestCase
 {
     public function testIncludeWithTemplateStringAndNoSandbox()
     {
-        $twig = new Environment($this->createMock('\Twig\Loader\LoaderInterface'));
+        $twig = new Environment(new ArrayLoader());
         $twig->addExtension(new StringLoaderExtension());
         $this->assertSame('something', CoreExtension::include($twig, [], StringLoaderExtension::templateFromString($twig, 'something')));
     }
diff --git a/tests/LexerTest.php b/tests/LexerTest.php
index 2aad47ac9..7926034ff 100644
--- a/tests/LexerTest.php
+++ b/tests/LexerTest.php
@@ -15,7 +15,7 @@ use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Error\SyntaxError;
 use Twig\Lexer;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Source;
 use Twig\Token;
 
@@ -25,7 +25,7 @@ class LexerTest extends TestCase
     {
         $template = '{% § %}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
 
         $stream->expect(Token::BLOCK_START_TYPE);
@@ -36,7 +36,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ §() }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
 
         $stream->expect(Token::VAR_START_TYPE);
@@ -63,7 +63,7 @@ class LexerTest extends TestCase
 
     protected function countToken($template, $type, $value = null)
     {
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
 
         $count = 0;
@@ -88,7 +88,7 @@ class LexerTest extends TestCase
             ."baz\n"
             ."}}\n";
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
 
         // foo\nbar\n
@@ -108,7 +108,7 @@ class LexerTest extends TestCase
             ."baz\n"
             ."}}\n";
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
 
         // foo\nbar
@@ -123,7 +123,7 @@ class LexerTest extends TestCase
     {
         $template = '{# '.str_repeat('*', 100000).' #}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
 
         // add a dummy assertion here to satisfy PHPUnit, the only thing we want to test is that the code above
@@ -135,7 +135,7 @@ class LexerTest extends TestCase
     {
         $template = '{% verbatim %}'.str_repeat('*', 100000).'{% endverbatim %}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
 
         // add a dummy assertion here to satisfy PHPUnit, the only thing we want to test is that the code above
@@ -147,7 +147,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ '.str_repeat('x', 100000).' }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
 
         // add a dummy assertion here to satisfy PHPUnit, the only thing we want to test is that the code above
@@ -159,7 +159,7 @@ class LexerTest extends TestCase
     {
         $template = '{% '.str_repeat('x', 100000).' %}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
 
         // add a dummy assertion here to satisfy PHPUnit, the only thing we want to test is that the code above
@@ -171,7 +171,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ 922337203685477580700 }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->next();
         $node = $stream->next();
@@ -185,7 +185,7 @@ class LexerTest extends TestCase
             '{{ "foo \" bar" }}' => 'foo " bar',
         ];
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         foreach ($tests as $template => $expected) {
             $stream = $lexer->tokenize(new Source($template, 'index'));
             $stream->expect(Token::VAR_START_TYPE);
@@ -201,7 +201,7 @@ class LexerTest extends TestCase
     {
         $template = 'foo {{ "bar #{ baz + 1 }" }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::TEXT_TYPE, 'foo ');
         $stream->expect(Token::VAR_START_TYPE);
@@ -222,7 +222,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ "bar \#{baz+1}" }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::VAR_START_TYPE);
         $stream->expect(Token::STRING_TYPE, 'bar #{baz+1}');
@@ -237,7 +237,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ "bar # baz" }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::VAR_START_TYPE);
         $stream->expect(Token::STRING_TYPE, 'bar # baz');
@@ -255,7 +255,7 @@ class LexerTest extends TestCase
 
         $template = '{{ "bar #{x" }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
     }
 
@@ -263,7 +263,7 @@ class LexerTest extends TestCase
     {
         $template = '{{ "bar #{ "foo#{bar}" }" }}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::VAR_START_TYPE);
         $stream->expect(Token::STRING_TYPE, 'bar ');
@@ -284,7 +284,7 @@ class LexerTest extends TestCase
     {
         $template = '{% foo "bar #{ "foo#{bar}" }" %}';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::BLOCK_START_TYPE);
         $stream->expect(Token::NAME_TYPE, 'foo');
@@ -306,7 +306,7 @@ class LexerTest extends TestCase
     {
         $template = "{{ 1 and\n0}}";
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $stream = $lexer->tokenize(new Source($template, 'index'));
         $stream->expect(Token::VAR_START_TYPE);
         $stream->expect(Token::NUMBER_TYPE, 1);
@@ -331,7 +331,7 @@ bar
 
 ';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
     }
 
@@ -349,14 +349,14 @@ bar
 
 ';
 
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         $lexer->tokenize(new Source($template, 'index'));
     }
 
     public function testOverridingSyntax()
     {
         $template = '[# comment #]{# variable #}/# if true #/true/# endif #/';
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)), [
+        $lexer = new Lexer(new Environment(new ArrayLoader()), [
             'tag_comment' => ['[#', '#]'],
             'tag_block' => ['/#', '#/'],
             'tag_variable' => ['{#', '#}'],
@@ -384,7 +384,7 @@ bar
      */
     public function testErrorsAtTheEndOfTheStream(string $template)
     {
-        $lexer = new Lexer(new Environment($this->createMock(LoaderInterface::class)));
+        $lexer = new Lexer(new Environment(new ArrayLoader()));
         set_error_handler(function () {
             $this->fail('Lexer should not emit warnings.');
         });
diff --git a/tests/Loader/ArrayTest.php b/tests/Loader/ArrayTest.php
index 76714bb08..543fe9ff6 100644
--- a/tests/Loader/ArrayTest.php
+++ b/tests/Loader/ArrayTest.php
@@ -21,7 +21,7 @@ class ArrayTest extends TestCase
     {
         $this->expectException(LoaderError::class);
 
-        $loader = new ArrayLoader([]);
+        $loader = new ArrayLoader();
 
         $loader->getSourceContext('foo');
     }
@@ -59,14 +59,14 @@ class ArrayTest extends TestCase
     {
         $this->expectException(LoaderError::class);
 
-        $loader = new ArrayLoader([]);
+        $loader = new ArrayLoader();
 
         $loader->getCacheKey('foo');
     }
 
     public function testSetTemplate()
     {
-        $loader = new ArrayLoader([]);
+        $loader = new ArrayLoader();
         $loader->setTemplate('foo', 'bar');
 
         $this->assertEquals('bar', $loader->getSourceContext('foo')->getCode());
@@ -82,7 +82,7 @@ class ArrayTest extends TestCase
     {
         $this->expectException(LoaderError::class);
 
-        $loader = new ArrayLoader([]);
+        $loader = new ArrayLoader();
 
         $loader->isFresh('foo', time());
     }
diff --git a/tests/Node/DeprecatedTest.php b/tests/Node/DeprecatedTest.php
index 24185f4b5..63259eda3 100644
--- a/tests/Node/DeprecatedTest.php
+++ b/tests/Node/DeprecatedTest.php
@@ -12,7 +12,7 @@ namespace Twig\Tests\Node;
  */
 
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\DeprecatedNode;
 use Twig\Node\Expression\ConstantExpression;
 use Twig\Node\Expression\FunctionExpression;
@@ -62,7 +62,7 @@ if (true) {
 EOF
         ];
 
-        $environment = new Environment($this->createMock(LoaderInterface::class));
+        $environment = new Environment(new ArrayLoader());
         $environment->addFunction(new TwigFunction('foo', 'foo', []));
 
         $expr = new FunctionExpression('foo', new Node(), 1);
diff --git a/tests/Node/Expression/FilterTest.php b/tests/Node/Expression/FilterTest.php
index 7234ac318..9af493069 100644
--- a/tests/Node/Expression/FilterTest.php
+++ b/tests/Node/Expression/FilterTest.php
@@ -15,7 +15,6 @@ use Twig\Environment;
 use Twig\Error\SyntaxError;
 use Twig\Extension\AbstractExtension;
 use Twig\Loader\ArrayLoader;
-use Twig\Loader\LoaderInterface;
 use Twig\Node\Expression\ConstantExpression;
 use Twig\Node\Expression\FilterExpression;
 use Twig\Node\Node;
@@ -38,7 +37,7 @@ class FilterTest extends NodeTestCase
 
     public function getTests()
     {
-        $environment = new Environment($this->createMock(LoaderInterface::class));
+        $environment = new Environment(new ArrayLoader());
         $environment->addFilter(new TwigFilter('bar', 'twig_tests_filter_dummy', ['needs_environment' => true]));
         $environment->addFilter(new TwigFilter('bar_closure', \Closure::fromCallable(twig_tests_filter_dummy::class), ['needs_environment' => true]));
         $environment->addFilter(new TwigFilter('barbar', 'Twig\Tests\Node\Expression\twig_tests_filter_barbar', ['needs_context' => true, 'is_variadic' => true]));
@@ -180,7 +179,7 @@ class FilterTest extends NodeTestCase
 
     protected function getEnvironment()
     {
-        $env = new Environment(new ArrayLoader([]));
+        $env = new Environment(new ArrayLoader());
         $env->addFilter(new TwigFilter('anonymous', function () {}));
 
         return $env;
diff --git a/tests/Node/Expression/FunctionTest.php b/tests/Node/Expression/FunctionTest.php
index aa40e3555..347e7c429 100644
--- a/tests/Node/Expression/FunctionTest.php
+++ b/tests/Node/Expression/FunctionTest.php
@@ -13,7 +13,6 @@ namespace Twig\Tests\Node\Expression;
 
 use Twig\Environment;
 use Twig\Loader\ArrayLoader;
-use Twig\Loader\LoaderInterface;
 use Twig\Node\Expression\ConstantExpression;
 use Twig\Node\Expression\FunctionExpression;
 use Twig\Node\Node;
@@ -34,7 +33,7 @@ class FunctionTest extends NodeTestCase
 
     public function getTests()
     {
-        $environment = new Environment($this->createMock(LoaderInterface::class));
+        $environment = new Environment(new ArrayLoader());
         $environment->addFunction(new TwigFunction('foo', 'twig_tests_function_dummy', []));
         $environment->addFunction(new TwigFunction('foo_closure', \Closure::fromCallable(twig_tests_function_dummy::class), []));
         $environment->addFunction(new TwigFunction('bar', 'twig_tests_function_dummy', ['needs_environment' => true]));
@@ -110,7 +109,7 @@ class FunctionTest extends NodeTestCase
 
     protected function getEnvironment()
     {
-        $env = new Environment(new ArrayLoader([]));
+        $env = new Environment(new ArrayLoader());
         $env->addFunction(new TwigFunction('anonymous', function () {}));
 
         return $env;
diff --git a/tests/Node/Expression/NameTest.php b/tests/Node/Expression/NameTest.php
index 57ba02b76..3e5437444 100644
--- a/tests/Node/Expression/NameTest.php
+++ b/tests/Node/Expression/NameTest.php
@@ -12,7 +12,7 @@ namespace Twig\Tests\Node\Expression;
  */
 
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\Expression\NameExpression;
 use Twig\Test\NodeTestCase;
 
@@ -31,8 +31,8 @@ class NameTest extends NodeTestCase
         $self = new NameExpression('_self', 1);
         $context = new NameExpression('_context', 1);
 
-        $env = new Environment($this->createMock(LoaderInterface::class), ['strict_variables' => true]);
-        $env1 = new Environment($this->createMock(LoaderInterface::class), ['strict_variables' => false]);
+        $env = new Environment(new ArrayLoader(), ['strict_variables' => true]);
+        $env1 = new Environment(new ArrayLoader(), ['strict_variables' => false]);
 
         $output = '(isset($context["foo"]) || array_key_exists("foo", $context) ? $context["foo"] : (function () { throw new RuntimeError(\'Variable "foo" does not exist.\', 1, $this->source); })())';
 
diff --git a/tests/Node/Expression/TestTest.php b/tests/Node/Expression/TestTest.php
index df7c7202b..1a5461666 100644
--- a/tests/Node/Expression/TestTest.php
+++ b/tests/Node/Expression/TestTest.php
@@ -13,7 +13,6 @@ namespace Twig\Tests\Node\Expression;
 
 use Twig\Environment;
 use Twig\Loader\ArrayLoader;
-use Twig\Loader\LoaderInterface;
 use Twig\Node\Expression\ConstantExpression;
 use Twig\Node\Expression\Test\NullTest;
 use Twig\Node\Expression\TestExpression;
@@ -37,7 +36,7 @@ class TestTest extends NodeTestCase
 
     public function getTests()
     {
-        $environment = new Environment($this->createMock(LoaderInterface::class));
+        $environment = new Environment(new ArrayLoader());
         $environment->addTest(new TwigTest('barbar', 'Twig\Tests\Node\Expression\twig_tests_test_barbar', ['is_variadic' => true, 'need_context' => true]));
 
         $tests = [];
@@ -79,7 +78,7 @@ class TestTest extends NodeTestCase
 
     protected function getEnvironment()
     {
-        $env = new Environment(new ArrayLoader([]));
+        $env = new Environment(new ArrayLoader());
         $env->addTest(new TwigTest('anonymous', function () {}));
 
         return $env;
diff --git a/tests/Node/ModuleTest.php b/tests/Node/ModuleTest.php
index 2b5e79c2c..974bc22ce 100644
--- a/tests/Node/ModuleTest.php
+++ b/tests/Node/ModuleTest.php
@@ -12,7 +12,7 @@ namespace Twig\Tests\Node;
  */
 
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\Expression\AssignNameExpression;
 use Twig\Node\Expression\ConditionalExpression;
 use Twig\Node\Expression\ConstantExpression;
@@ -45,7 +45,7 @@ class ModuleTest extends NodeTestCase
 
     public function getTests()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader(['foo.twig' => '{{ foo }}']));
 
         $tests = [];
 
@@ -218,7 +218,7 @@ EOF
             2
         );
 
-        $twig = new Environment($this->createMock(LoaderInterface::class), ['debug' => true]);
+        $twig = new Environment(new ArrayLoader(['foo.twig' => '{{ foo }}']), ['debug' => true]);
         $node = new ModuleNode($body, $extends, $blocks, $macros, $traits, new Node([]), $source);
         $tests[] = [$node, <<<EOF
 <?php
diff --git a/tests/NodeVisitor/OptimizerTest.php b/tests/NodeVisitor/OptimizerTest.php
index 96d5ef5b1..f0f61132b 100644
--- a/tests/NodeVisitor/OptimizerTest.php
+++ b/tests/NodeVisitor/OptimizerTest.php
@@ -13,7 +13,7 @@ namespace Twig\Tests\NodeVisitor;
 
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\Expression\BlockReferenceExpression;
 use Twig\Node\Expression\NameExpression;
 use Twig\Node\Expression\ParentExpression;
@@ -25,7 +25,7 @@ class OptimizerTest extends TestCase
 {
     public function testRenderBlockOptimizer()
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
 
         $stream = $env->parse($env->tokenize(new Source('{{ block("foo") }}', 'index')));
 
@@ -37,7 +37,7 @@ class OptimizerTest extends TestCase
 
     public function testRenderParentBlockOptimizer()
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
 
         $stream = $env->parse($env->tokenize(new Source('{% extends "foo" %}{% block content %}{{ parent() }}{% endblock %}', 'index')));
 
@@ -49,7 +49,7 @@ class OptimizerTest extends TestCase
 
     public function testForVarOptimizer()
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false, 'autoescape' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false, 'autoescape' => false]);
 
         $template = '{% for i, j in foo %}{{ loop.index }}{{ i }}{{ j }}{% endfor %}';
         $stream = $env->parse($env->tokenize(new Source($template, 'index')));
@@ -75,7 +75,7 @@ class OptimizerTest extends TestCase
      */
     public function testForLoopOptimizer($template, $expected)
     {
-        $env = new Environment($this->createMock(LoaderInterface::class), ['cache' => false]);
+        $env = new Environment(new ArrayLoader(), ['cache' => false]);
 
         $stream = $env->parse($env->tokenize(new Source($template, 'index')));
 
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index cdd8e8757..73de41e6f 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -14,7 +14,7 @@ namespace Twig\Tests;
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
 use Twig\Error\SyntaxError;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\Node\Node;
 use Twig\Node\SetNode;
 use Twig\Node\TextNode;
@@ -37,7 +37,7 @@ class ParserTest extends TestCase
             new Token(Token::BLOCK_END_TYPE, '', 1),
             new Token(Token::EOF_TYPE, '', 1),
         ]);
-        $parser = new Parser(new Environment($this->createMock(LoaderInterface::class)));
+        $parser = new Parser(new Environment(new ArrayLoader()));
         $parser->parse($stream);
     }
 
@@ -52,7 +52,7 @@ class ParserTest extends TestCase
             new Token(Token::BLOCK_END_TYPE, '', 1),
             new Token(Token::EOF_TYPE, '', 1),
         ]);
-        $parser = new Parser(new Environment($this->createMock(LoaderInterface::class)));
+        $parser = new Parser(new Environment(new ArrayLoader()));
         $parser->parse($stream);
     }
 
@@ -133,7 +133,7 @@ class ParserTest extends TestCase
 
     public function testParseIsReentrant()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class), [
+        $twig = new Environment(new ArrayLoader(), [
             'autoescape' => false,
             'optimizations' => 0,
         ]);
@@ -156,7 +156,7 @@ class ParserTest extends TestCase
 
     public function testGetVarName()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class), [
+        $twig = new Environment(new ArrayLoader(), [
             'autoescape' => false,
             'optimizations' => 0,
         ]);
@@ -177,7 +177,7 @@ EOF
 
     protected function getParser()
     {
-        $parser = new Parser(new Environment($this->createMock(LoaderInterface::class)));
+        $parser = new Parser(new Environment(new ArrayLoader()));
         $parser->setParent(new Node());
 
         $p = new \ReflectionProperty($parser, 'stream');
diff --git a/tests/TemplateTest.php b/tests/TemplateTest.php
index 1256b5df5..8ee46c19b 100644
--- a/tests/TemplateTest.php
+++ b/tests/TemplateTest.php
@@ -29,7 +29,7 @@ class TemplateTest extends TestCase
     {
         $this->expectException(\LogicException::class);
 
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig);
         $template->displayBlock('foo', [], ['foo' => [new \stdClass(), 'foo']]);
     }
@@ -89,7 +89,7 @@ class TemplateTest extends TestCase
      */
     public function testGetAttributeWithSandbox($object, $item, $allowed)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $policy = new SecurityPolicy([], [], [/* method */], [/* prop */], []);
         $twig->addExtension(new SandboxExtension($policy, !$allowed));
         $template = new TemplateForTest($twig);
@@ -146,7 +146,7 @@ class TemplateTest extends TestCase
         $this->expectException(RuntimeError::class);
         $this->expectExceptionMessage('Block "unknown" on template "index.twig" does not exist in "index.twig".');
 
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig, 'index.twig');
         $template->renderBlock('unknown', []);
     }
@@ -156,7 +156,7 @@ class TemplateTest extends TestCase
         $this->expectException(RuntimeError::class);
         $this->expectExceptionMessage('Block "unknown" on template "index.twig" does not exist in "index.twig".');
 
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig, 'index.twig');
         $template->displayBlock('unknown', []);
     }
@@ -166,14 +166,14 @@ class TemplateTest extends TestCase
         $this->expectException(RuntimeError::class);
         $this->expectExceptionMessage('Block "foo" should not call parent() in "index.twig" as the block does not exist in the parent template "parent.twig"');
 
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig, 'parent.twig');
         $template->displayBlock('foo', [], ['foo' => [new TemplateForTest($twig, 'index.twig'), 'block_foo']], false);
     }
 
     public function testGetAttributeOnArrayWithConfusableKey()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig);
 
         $array = ['Zero', 'One', -1 => 'MinusOne', '' => 'EmptyString', '1.5' => 'FloatButString', '01' => 'IntegerButStringWithLeadingZeros'];
@@ -208,7 +208,7 @@ class TemplateTest extends TestCase
      */
     public function testGetAttribute($defined, $value, $object, $item, $arguments, $type)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig);
 
         $this->assertEquals($value, CoreExtension::getAttribute($twig, $template->getSourceContext(), $object, $item, $arguments, $type));
@@ -219,7 +219,7 @@ class TemplateTest extends TestCase
      */
     public function testGetAttributeStrict($defined, $value, $object, $item, $arguments, $type, $exceptionMessage = null)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class), ['strict_variables' => true]);
+        $twig = new Environment(new ArrayLoader(), ['strict_variables' => true]);
         $template = new TemplateForTest($twig);
 
         if ($defined) {
@@ -238,7 +238,7 @@ class TemplateTest extends TestCase
      */
     public function testGetAttributeDefined($defined, $value, $object, $item, $arguments, $type)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig);
 
         $this->assertEquals($defined, CoreExtension::getAttribute($twig, $template->getSourceContext(), $object, $item, $arguments, $type, true));
@@ -249,7 +249,7 @@ class TemplateTest extends TestCase
      */
     public function testGetAttributeDefinedStrict($defined, $value, $object, $item, $arguments, $type)
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class), ['strict_variables' => true]);
+        $twig = new Environment(new ArrayLoader(), ['strict_variables' => true]);
         $template = new TemplateForTest($twig);
 
         $this->assertEquals($defined, CoreExtension::getAttribute($twig, $template->getSourceContext(), $object, $item, $arguments, $type, true));
@@ -257,7 +257,7 @@ class TemplateTest extends TestCase
 
     public function testGetAttributeCallExceptions()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $template = new TemplateForTest($twig);
 
         $object = new TemplateMagicMethodExceptionObject();
@@ -403,7 +403,7 @@ class TemplateTest extends TestCase
 
     public function testGetIsMethods()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
 
         $getIsObject = new TemplateGetIsMethods();
         $template = new TemplateForTest($twig, 'index.twig');
diff --git a/tests/Util/DeprecationCollectorTest.php b/tests/Util/DeprecationCollectorTest.php
index 18f889f6a..547744e0b 100644
--- a/tests/Util/DeprecationCollectorTest.php
+++ b/tests/Util/DeprecationCollectorTest.php
@@ -13,7 +13,7 @@ namespace Twig\Tests\Util;
 
 use PHPUnit\Framework\TestCase;
 use Twig\Environment;
-use Twig\Loader\LoaderInterface;
+use Twig\Loader\ArrayLoader;
 use Twig\TwigFunction;
 use Twig\Util\DeprecationCollector;
 
@@ -24,7 +24,7 @@ class DeprecationCollectorTest extends TestCase
      */
     public function testCollect()
     {
-        $twig = new Environment($this->createMock(LoaderInterface::class));
+        $twig = new Environment(new ArrayLoader());
         $twig->addFunction(new TwigFunction('deprec', [$this, 'deprec'], ['deprecated' => '1.1']));
 
         $collector = new DeprecationCollector($twig);