diff --git a/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php b/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
index 1507a13..34d86ca 100644
--- a/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
+++ b/src/Type/PHPUnit/Assert/AssertTypeSpecifyingExtensionHelper.php
@@ -276,6 +276,21 @@ private static function getExpressionResolvers(): array
 				'ObjectHasAttribute' => static function (Scope $scope, Arg $property, Arg $object): FuncCall {
 					return new FuncCall(new Name('property_exists'), [$object, $property]);
 				},
+				'Contains' => static function (Scope $scope, Arg $needle, Arg $haystack): Expr {
+					return new Expr\BinaryOp\BooleanOr(
+						new Expr\Instanceof_($haystack->value, new Name('Traversable')),
+						new FuncCall(new Name('in_array'), [$needle, $haystack, new Arg(new ConstFetch(new Name('true')))])
+					);
+				},
+				'ContainsEquals' => static function (Scope $scope, Arg $needle, Arg $haystack): Expr {
+					return new Expr\BinaryOp\BooleanOr(
+						new Expr\Instanceof_($haystack->value, new Name('Traversable')),
+						new Expr\BinaryOp\BooleanAnd(
+							new Expr\BooleanNot(new Expr\Empty_($haystack->value)),
+							new FuncCall(new Name('in_array'), [$needle, $haystack, new Arg(new ConstFetch(new Name('false')))])
+						)
+					);
+				},
 				'ContainsOnlyInstancesOf' => static function (Scope $scope, Arg $className, Arg $haystack): Expr {
 					return new Expr\BinaryOp\BooleanOr(
 						new Expr\Instanceof_($haystack->value, new Name('Traversable')),
diff --git a/tests/Type/PHPUnit/data/assert-function.php b/tests/Type/PHPUnit/data/assert-function.php
index 84102c9..15c4371 100644
--- a/tests/Type/PHPUnit/data/assert-function.php
+++ b/tests/Type/PHPUnit/data/assert-function.php
@@ -4,6 +4,8 @@
 
 use function PHPStan\Testing\assertType;
 use function PHPUnit\Framework\assertArrayHasKey;
+use function PHPUnit\Framework\assertContains;
+use function PHPUnit\Framework\assertContainsEquals;
 use function PHPUnit\Framework\assertContainsOnlyInstancesOf;
 use function PHPUnit\Framework\assertEmpty;
 use function PHPUnit\Framework\assertInstanceOf;
@@ -61,6 +63,24 @@ public function testEmpty($a): void
 		assertType("0|0.0|''|'0'|array{}|Countable|EmptyIterator|false|null", $a);
 	}
 
+	public function contains(array $a, \Traversable $b): void
+	{
+		assertContains('foo', $a);
+		assertType('non-empty-array', $a);
+
+		assertContains('foo', $b);
+		assertType('Traversable', $b);
+	}
+
+	public function containsEquals(array $a, \Traversable $b): void
+	{
+		assertContainsEquals('foo', $a);
+		assertType('non-empty-array', $a);
+
+		assertContainsEquals('foo', $b);
+		assertType('Traversable', $b);
+	}
+
 	public function containsOnlyInstancesOf(array $a, \Traversable $b): void
 	{
 		assertContainsOnlyInstancesOf(\stdClass::class, $a);