diff --git a/tests/phpunit/tests/functions/wpCacheSetLastChanged.php b/tests/phpunit/tests/functions/wpCacheSetLastChanged.php
new file mode 100644
index 0000000000000..9394801c9600f
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpCacheSetLastChanged.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Tests for the wp_cache_set_last_changed() function.
+ *
+ * @group functions
+ *
+ * @covers ::wp_cache_set_last_changed
+ */
+class Tests_functions_wpCacheSetLastChanged extends WP_UnitTestCase {
+
+	/**
+	 * Check the cache key last_changed is set for the specified group.
+	 *
+	 * @ticket 59737
+	 */
+	public function test_wp_cache_set_last_changed() {
+		$group = 'group_name';
+
+		$this->assertSame( wp_cache_set_last_changed( $group ), wp_cache_get( 'last_changed', $group ) );
+	}
+
+	/**
+	 * Check the action is called.
+	 *
+	 * @ticket 59737
+	 */
+	public function test_wp_cache_set_last_changed_action_is_called() {
+		$a1 = new MockAction();
+		add_action( 'wp_cache_set_last_changed', array( $a1, 'action' ) );
+
+		wp_cache_set_last_changed( 'group_name' );
+
+		$this->assertSame( 1, $a1->get_call_count() );
+	}
+}