Add StringEndsWith constraint

README.md

@@ -40,6 +40,7 @@ class ExampleTest extends PHPUnit\Framework\TestCase
 * [IsURL](./src/Constraint/IsURL.php): asserts that a string contains only an URL
 * [IsEmail](./src/Constraint/IsEmail.php): asserts that a string contains only an email address
 * [StringStartsWith](./src/Constraint/StringStartsWith.php): asserts that a string starts with another string
+* [StringEndsWith](./src/Constraint/StringEndsWith.php): asserts that a string ends with another string
 
 ## Tests
 

src/Constraint/StringEndsWith.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PHPUnitExtraConstraints\Constraint;
+
+use PHPUnit\Framework\Constraint\Constraint;
+
+use function is_string;
+use function strlen;
+use function substr_compare;
+
+/**
+ * Constraint that asserts that a string ends with another string.
+ */
+final class StringEndsWith extends Constraint
+{
+    /** @var string */
+    private $needle;
+
+    public function __construct(string $needle)
+    {
+        $this->needle = $needle;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    protected function matches($other): bool
+    {
+        return is_string($other)
+            && self::endsWith($other, $this->needle);
+    }
+
+    private static function endsWith(string $haystack, string $needle): bool
+    {
+        return '' === $needle || ('' !== $haystack && 0 === substr_compare($haystack, $needle, -strlen($needle)));
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function toString(): string
+    {
+        return 'ends with ' . $this->needle;
+    }
+}

tests/Constraint/StringEndsWithTest.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\PHPUnitExtraConstraints\Constraint;
+
+use PHPUnitExtraConstraints\Constraint\StringEndsWith;
+use Tests\PHPUnitExtraConstraints\CustomTestCase;
+
+class StringEndsWithTest extends CustomTestCase
+{
+    /**
+     * @dataProvider provideValidStrings
+     * @testdox testWithValidString: $value ends with $needle
+     *
+     * @param string $needle
+     * @param string $value
+     */
+    public function testWithValidString(string $needle, string $value): void
+    {
+        $constraint = new StringEndsWith($needle);
+        self::assertThat($value, $constraint);
+    }
+
+    /**
+     * @return iterable<array<string>>
+     */
+    public function provideValidStrings(): iterable
+    {
+        yield ['c', 'abc'];
+        yield ['bc', 'abc'];
+        yield ['abc', 'abc'];
+        yield ['', 'abc'];
+        yield ['0', '00'];
+    }
+
+    /**
+     * @dataProvider provideInvalidStrings
+     * @testdox testWithInvalidString: $value doesn't end with $needle
+     *
+     * @param string $needle
+     * @param mixed $value
+     */
+    public function testWithInvalidString(string $needle, $value): void
+    {
+        $constraint = new StringEndsWith($needle);
+        $this->expectAssertionFailedError('ends with ' . $needle);
+        self::assertThat($value, $constraint);
+    }
+
+    /**
+     * @return iterable<array<mixed>>
+     */
+    public function provideInvalidStrings(): iterable
+    {
+        yield ['zzz', null];
+        yield ['zzz', true];
+        yield ['zzz', false];
+        yield ['zzz', 0];
+        yield ['zzz', 1];
+        yield ['zzz', []];
+        yield ['zzz', (object) []];
+        yield ['zzz', 'abc'];
+        yield ['zzz', 'z'];
+    }
+}