Tests: Use assertSame() in populate_network() 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 [60954].

See #64324.

git-svn-id: https://develop.svn.wordpress.org/trunk@61420 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/multisite/populateNetworkHooks.php

@@ -59,10 +59,10 @@ public function test_before_populate_network_hook() {
 			$this->assertSame( 1, $this->action_counts['before_populate_network'], 'before_populate_network action should fire once' );
 			$this->assertSame( 1, $this->action_counts['after_populate_network'], 'after_populate_network action should fire once' );
 
-			$this->assertEquals( $network_id, $this->action_args['before_populate_network']['network_id'], 'Network ID should match in before_populate_network hook' );
-			$this->assertEquals( $domain, $this->action_args['before_populate_network']['domain'], 'Domain should match in before_populate_network hook' );
-			$this->assertEquals( $network_id, $this->action_args['after_populate_network']['network_id'], 'Network ID should match in after_populate_network hook' );
-			$this->assertEquals( $domain, $this->action_args['after_populate_network']['domain'], 'Domain should match in after_populate_network hook' );
+			$this->assertSame( $network_id, $this->action_args['before_populate_network']['network_id'], 'Network ID should match in before_populate_network hook' );
+			$this->assertSame( $domain, $this->action_args['before_populate_network']['domain'], 'Domain should match in before_populate_network hook' );
+			$this->assertSame( $network_id, $this->action_args['after_populate_network']['network_id'], 'Network ID should match in after_populate_network hook' );
+			$this->assertSame( $domain, $this->action_args['after_populate_network']['domain'], 'Domain should match in after_populate_network hook' );
 
 			remove_action( 'before_populate_network', array( $this, 'hook_action_counter' ), 10 );
 			remove_action( 'after_populate_network', array( $this, 'hook_action_counter' ), 10 );