diff --git a/.php_cs.fixture b/.php_cs.fixture
index f15413d5..2a943d92 100644
--- a/.php_cs.fixture
+++ b/.php_cs.fixture
@@ -5,7 +5,9 @@ declare(strict_types=1);
 use Localheinz\PhpCsFixer\Config;
 
 $config = Config\Factory::fromRuleSet(new Config\RuleSet\Php71(''), [
+    'declare_strict_types' => false,
     'final_class' => false,
+    'header_comment' => false,
     'lowercase_constants' => false,
     'lowercase_keywords' => false,
     'magic_method_casing' => false,
diff --git a/.travis.yml b/.travis.yml
index 41837a5a..6d2347cf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -154,7 +154,7 @@ jobs:
         - mkdir -p $HOME/.build/infection
 
       script:
-        - vendor/bin/infection --ignore-msi-with-no-mutations --min-covered-msi=86 --min-msi=86
+        - vendor/bin/infection --ignore-msi-with-no-mutations --min-covered-msi=98 --min-msi=85
 
 notifications:
   email: false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e193fa8..9bdb0f0b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 For a full diff see [`0.10.0...master`](https://github.com/localheinz/phpstan-rules/compare/0.10.0...master).
 
+### Added
+
+* Added `Files\DeclareStrictTypesRule`, which reports an error when a PHP file does not have a `declare(strict_types=1)` declaration ([#79](https://github.com/localheinz/phpstan-rules/pull/79)), by [@dmecke](https://github.com/dmecke)
+
 ### Changed
 
 * Require at least `nikic/php-parser:~0.11.15` ([#102](https://github.com/localheinz/phpstan-rules/pull/102)), by [@localheinz](https://github.com/localheinz)
diff --git a/Makefile b/Makefile
index 6b900fa2..f2c0126f 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ help: ## Displays this list of targets with descriptions
 
 infection: vendor ## Runs mutation tests with infection
 	mkdir -p .build/infection
-	vendor/bin/infection --ignore-msi-with-no-mutations --min-covered-msi=86 --min-msi=86
+	vendor/bin/infection --ignore-msi-with-no-mutations --min-covered-msi=98 --min-msi=85
 
 stan: vendor ## Runs a static analysis with phpstan
 	mkdir -p .build/phpstan
diff --git a/README.md b/README.md
index e8940890..b0428be0 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ This package provides the following rules for use with [`phpstan/phpstan`](https
 * [`Localheinz\PHPStan\Rules\Closures\NoParameterWithNullableTypeDeclarationRule`](https://github.com/localheinz/phpstan-rules#closuresnoparameterwithnullabletypedeclarationrule)
 * [`Localheinz\PHPStan\Rules\Closures\NoParameterWithNullDefaultValueRule`](https://github.com/localheinz/phpstan-rules#closuresnoparameterwithnulldefaultvaluerule)
 * [`Localheinz\PHPStan\Rules\Expressions\NoIssetRule`](https://github.com/localheinz/phpstan-rules#expressionsnoissetrule)
+* [`Localheinz\PHPStan\Rules\Files\DeclareStrictTypesRule`](https://github.com/localheinz/phpstan-rules#filesdeclarestricttypesrule)
 * [`Localheinz\PHPStan\Rules\Functions\NoNullableReturnTypeDeclarationRule`](https://github.com/localheinz/phpstan-rules#functionsnonullablereturntypedeclarationrule)
 * [`Localheinz\PHPStan\Rules\Functions\NoParameterWithNullableTypeDeclaration`](https://github.com/localheinz/phpstan-rules#functionsnoparameterwithnullabletypedeclarationrule)
 * [`Localheinz\PHPStan\Rules\Functions\NoParameterWithNullDefaultValueRule`](https://github.com/localheinz/phpstan-rules#functionsnoparameterwithnulldefaultvaluerule)
@@ -121,6 +122,12 @@ This rule reports an error when a closure has a parameter with `null` as default
 
 This rule reports an error when the language construct `isset()` is used.
 
+### Files
+
+#### `Files\DeclareStrictTypesRule`
+
+This rule reports an error when a non-empty file does not contain a `declare(strict_types=1)` declaration.
+
 ### Functions
 
 #### `Functions\NoNullableReturnTypeDeclarationRule`
diff --git a/rules.neon b/rules.neon
index e7f1ebc3..8daedda9 100644
--- a/rules.neon
+++ b/rules.neon
@@ -12,6 +12,7 @@ rules:
 	- Localheinz\PHPStan\Rules\Closures\NoNullableReturnTypeDeclarationRule
 	- Localheinz\PHPStan\Rules\Closures\NoParameterWithNullableTypeDeclarationRule
 	- Localheinz\PHPStan\Rules\Expressions\NoIssetRule
+	- Localheinz\PHPStan\Rules\Files\DeclareStrictTypesRule
 	- Localheinz\PHPStan\Rules\Functions\NoNullableReturnTypeDeclarationRule
 	- Localheinz\PHPStan\Rules\Functions\NoParameterWithNullableTypeDeclarationRule
 	- Localheinz\PHPStan\Rules\Functions\NoParameterWithNullDefaultValueRule
diff --git a/src/Files/DeclareStrictTypesRule.php b/src/Files/DeclareStrictTypesRule.php
new file mode 100644
index 00000000..a15758c9
--- /dev/null
+++ b/src/Files/DeclareStrictTypesRule.php
@@ -0,0 +1,63 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright (c) 2018 Andreas Möller
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * @see https://github.com/localheinz/phpstan-rules
+ */
+
+namespace Localheinz\PHPStan\Rules\Files;
+
+use PhpParser\Node;
+use PHPStan\Analyser\Scope;
+use PHPStan\Node\FileNode;
+use PHPStan\Rules\Rule;
+use PHPStan\ShouldNotHappenException;
+
+final class DeclareStrictTypesRule implements Rule
+{
+    public function getNodeType(): string
+    {
+        return FileNode::class;
+    }
+
+    public function processNode(Node $node, Scope $scope): array
+    {
+        if (!$node instanceof FileNode) {
+            throw new ShouldNotHappenException(\sprintf(
+                'Expected node to be instance of "%s", but got instance of "%s" instead.',
+                FileNode::class,
+                \get_class($node)
+            ));
+        }
+
+        $nodes = $node->getNodes();
+
+        if (0 === \count($nodes)) {
+            return [];
+        }
+
+        $firstNode = \array_shift($nodes);
+
+        if ($firstNode instanceof Node\Stmt\Declare_) {
+            foreach ($firstNode->declares as $declare) {
+                if (
+                    'strict_types' === $declare->key->toLowerString()
+                    && $declare->value instanceof Node\Scalar\LNumber
+                    && 1 === $declare->value->value
+                ) {
+                    return [];
+                }
+            }
+        }
+
+        return [
+            'File is missing a "declare(strict_types=1)" declaration.',
+        ];
+    }
+}
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-invalid-casing.php
new file mode 100644
index 00000000..08650efe
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-invalid-casing.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(sTrIcT_tYpEs=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-multiple-declares.php
new file mode 100644
index 00000000..4be7bcf3
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-multiple-declares.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(ticks=5, strict_types = 0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off.php
new file mode 100644
index 00000000..52a7a4b8
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(strict_types=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-invalid-casing.php
new file mode 100644
index 00000000..40fd8cee
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-invalid-casing.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(sTrIcT_tYpEs=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-multiple-declares.php
new file mode 100644
index 00000000..3152ed8e
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-multiple-declares.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(ticks=5, strict_types = 0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off.php
new file mode 100644
index 00000000..b1833afa
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(strict_types=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-ticks.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-ticks.php
new file mode 100644
index 00000000..614fe868
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-ticks.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(ticks=5);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-invalid-casing.php
new file mode 100644
index 00000000..e55d4704
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-invalid-casing.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(sTrIcT_tYpEs=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-multiple-declares.php
new file mode 100644
index 00000000..041e7a60
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-multiple-declares.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(ticks=5, strict_types = 0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off.php
new file mode 100644
index 00000000..fa103ea9
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(strict_types=0);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types-and-namespace-declaration.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types-and-namespace-declaration.php
new file mode 100644
index 00000000..57aec16d
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types-and-namespace-declaration.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace Localheinz\PHPStan\Rules\Test\Fixture\Classes\DeclareStrictTypesRule\Failure;
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types.php b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types.php
new file mode 100644
index 00000000..655bf8b3
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types.php
@@ -0,0 +1,3 @@
+<?php
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-empty.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-empty.php
new file mode 100644
index 00000000..b3d9bbc7
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-empty.php
@@ -0,0 +1 @@
+<?php
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-invalid-casing.php
new file mode 100644
index 00000000..84487c4e
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-invalid-casing.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(sTrIcT_tYpEs=1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-multiple-declares.php
new file mode 100644
index 00000000..f329af47
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-multiple-declares.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(ticks=5, strict_types = 1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-namespace-declaration.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-namespace-declaration.php
new file mode 100644
index 00000000..b43eabb1
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-namespace-declaration.php
@@ -0,0 +1,9 @@
+<?php
+
+// Hmm
+
+declare(strict_types=1);
+
+namespace Localheinz\PHPStan\Rules\Test\Fixture\Classes\DeclareStrictTypesRule\Success;
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on.php
new file mode 100644
index 00000000..6453b20d
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on.php
@@ -0,0 +1,7 @@
+<?php
+
+// Hmm
+
+declare(strict_types=1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-invalid-casing.php
new file mode 100644
index 00000000..5899b39c
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-invalid-casing.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(sTrIcT_tYpEs=1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-multiple-declares.php
new file mode 100644
index 00000000..2637859c
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-multiple-declares.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(ticks=5, strict_types = 1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-namespace-declaration.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-namespace-declaration.php
new file mode 100644
index 00000000..396ab1af
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-namespace-declaration.php
@@ -0,0 +1,7 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Localheinz\PHPStan\Rules\Test\Fixture\Classes\DeclareStrictTypesRule\Success;
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on.php
new file mode 100644
index 00000000..b1fab456
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on.php
@@ -0,0 +1,5 @@
+<?php
+
+declare(strict_types=1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-invalid-casing.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-invalid-casing.php
new file mode 100644
index 00000000..9b2fe3b3
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-invalid-casing.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(sTrIcT_tYpEs=1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-multiple-declares.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-multiple-declares.php
new file mode 100644
index 00000000..afb80ad0
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-multiple-declares.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(ticks=5, strict_types = 1);
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-namespace-declaration.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-namespace-declaration.php
new file mode 100644
index 00000000..7b222a8d
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-namespace-declaration.php
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(strict_types=1);
+
+namespace Localheinz\PHPStan\Rules\Test\Fixture\Classes\DeclareStrictTypesRule\Success;
+
+echo 'Hello!';
diff --git a/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on.php b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on.php
new file mode 100644
index 00000000..c5119831
--- /dev/null
+++ b/test/Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Hmm.
+ */
+
+declare(strict_types=1);
+
+echo 'Hello!';
diff --git a/test/Integration/Files/DeclareStrictTypesRuleTest.php b/test/Integration/Files/DeclareStrictTypesRuleTest.php
new file mode 100644
index 00000000..5dbf1974
--- /dev/null
+++ b/test/Integration/Files/DeclareStrictTypesRuleTest.php
@@ -0,0 +1,153 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright (c) 2018 Andreas Möller
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * @see https://github.com/localheinz/phpstan-rules
+ */
+
+namespace Localheinz\PHPStan\Rules\Test\Integration\Files;
+
+use Localheinz\PHPStan\Rules\Files\DeclareStrictTypesRule;
+use Localheinz\PHPStan\Rules\Test\Integration\AbstractTestCase;
+use PHPStan\Rules\Rule;
+
+/**
+ * @internal
+ *
+ * @covers \Localheinz\PHPStan\Rules\Files\DeclareStrictTypesRule
+ */
+final class DeclareStrictTypesRuleTest extends AbstractTestCase
+{
+    public function providerAnalysisSucceeds(): iterable
+    {
+        $paths = [
+            'file-empty' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-empty.php',
+            'file-with-comment-and-declare-strict-types-on' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on.php',
+            'file-with-comment-and-declare-strict-types-on-and-invalid-casing' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-invalid-casing.php',
+            'file-with-comment-and-declare-strict-types-on-and-multiple-declares' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-multiple-declares.php',
+            'file-with-comment-and-declare-strict-types-on-and-namespace-declaration' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-comment-and-declare-strict-types-on-and-namespace-declaration.php',
+            'file-with-declare-strict-types-on' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on.php',
+            'file-with-declare-strict-types-on-and-invalid-casing' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-invalid-casing.php',
+            'file-with-declare-strict-types-on-and-multiple-declares' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-multiple-declares.php',
+            'file-with-declare-strict-types-on-and-namespace-declaration' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-declare-strict-types-on-and-namespace-declaration.php',
+            'file-with-doc-block-and-declare-strict-types-on' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on.php',
+            'file-with-doc-block-and-declare-strict-types-on-and-invalid-casing' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-invalid-casing.php',
+            'file-with-doc-block-and-declare-strict-types-on-and-multiple-declares' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-multiple-declares.php',
+            'file-with-doc-block-and-declare-strict-types-on-and-namespace-declaration' => __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Success/file-with-doc-block-and-declare-strict-types-on-and-namespace-declaration.php',
+        ];
+
+        foreach ($paths as $description => $path) {
+            yield $description => [
+                $path,
+            ];
+        }
+    }
+
+    public function providerAnalysisFails(): iterable
+    {
+        $paths = [
+            'file-with-comment-and-declare-strict-types-off' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    5,
+                ],
+            ],
+            'file-with-comment-and-declare-strict-types-off-and-invalid-casing' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-invalid-casing.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    5,
+                ],
+            ],
+            'file-with-comment-and-declare-strict-types-off-and-multiple-declares' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-comment-and-declare-strict-types-off-and-multiple-declares.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    5,
+                ],
+            ],
+            'file-with-declare-strict-types-off' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+            'file-with-declare-strict-types-off-and-invalid-casing' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-invalid-casing.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+            'file-with-declare-strict-types-off-and-multiple-declares' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-strict-types-off-and-multiple-declares.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+            'file-with-declare-ticks' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-declare-ticks.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+            'file-with-doc-block-and-declare-strict-types-off' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    7,
+                ],
+            ],
+            'file-with-doc-block-and-declare-strict-types-off-and-invalid-casing' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-invalid-casing.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    7,
+                ],
+            ],
+            'file-with-doc-block-and-declare-strict-types-off-and-multiple-declares' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-with-doc-block-and-declare-strict-types-off-and-multiple-declares.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    7,
+                ],
+            ],
+            'file-without-declare-strict-types-and-namespace-declaration' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types-and-namespace-declaration.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+            'file-without-declare-strict-types' => [
+                __DIR__ . '/../../Fixture/Files/DeclareStrictTypesRule/Failure/file-without-declare-strict-types.php',
+                [
+                    'File is missing a "declare(strict_types=1)" declaration.',
+                    3,
+                ],
+            ],
+        ];
+
+        foreach ($paths as $description => [$path, $error]) {
+            yield $description => [
+                $path,
+                $error,
+            ];
+        }
+    }
+
+    protected function getRule(): Rule
+    {
+        return new DeclareStrictTypesRule();
+    }
+}