Tests: Use assertSame() in comment_exists() tests.

This ensures that not only the return values match the expected results, but also that their type is the same.

Going forward, stricter type checking by using `assertSame()` should generally be preferred to `assertEquals()` where appropriate, to make the tests more reliable.

Follow-up to [34456], [34460].

Props costdev.
See #59655.

git-svn-id: https://develop.svn.wordpress.org/trunk@57705 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/admin/includesComment.php

@@ -52,7 +52,7 @@ public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
 	 */
 	public function test_must_match_date_and_author() {
 		$this->assertNull( comment_exists( 1, '2004-01-02 12:00:00' ) );
-		$this->assertEquals( self::$post_id, comment_exists( 1, '2014-05-06 12:00:00' ) );
+		$this->assertSame( (string) self::$post_id, comment_exists( 1, '2014-05-06 12:00:00' ) );
 	}
 
 	/**
@@ -61,7 +61,7 @@ public function test_must_match_date_and_author() {
 	 * @covers ::comment_exists
 	 */
 	public function test_default_value_of_timezone_should_be_blog() {
-		$this->assertEquals( self::$post_id, comment_exists( 1, '2014-05-06 12:00:00' ) );
+		$this->assertSame( (string) self::$post_id, comment_exists( 1, '2014-05-06 12:00:00' ) );
 	}
 
 	/**
@@ -70,7 +70,7 @@ public function test_default_value_of_timezone_should_be_blog() {
 	 * @covers ::comment_exists
 	 */
 	public function test_should_respect_timezone_blog() {
-		$this->assertEquals( self::$post_id, comment_exists( 1, '2014-05-06 12:00:00', 'blog' ) );
+		$this->assertSame( (string) self::$post_id, comment_exists( 1, '2014-05-06 12:00:00', 'blog' ) );
 	}
 
 	/**
@@ -79,7 +79,7 @@ public function test_should_respect_timezone_blog() {
 	 * @covers ::comment_exists
 	 */
 	public function test_should_respect_timezone_gmt() {
-		$this->assertEquals( self::$post_id, comment_exists( 1, '2014-05-06 07:00:00', 'gmt' ) );
+		$this->assertSame( (string) self::$post_id, comment_exists( 1, '2014-05-06 07:00:00', 'gmt' ) );
 	}
 
 	/**
@@ -88,6 +88,6 @@ public function test_should_respect_timezone_gmt() {
 	 * @covers ::comment_exists
 	 */
 	public function test_invalid_timezone_should_fall_back_on_blog() {
-		$this->assertEquals( self::$post_id, comment_exists( 1, '2014-05-06 12:00:00', 'not_a_valid_value' ) );
+		$this->assertSame( (string) self::$post_id, comment_exists( 1, '2014-05-06 12:00:00', 'not_a_valid_value' ) );
 	}
 }