diff --git a/tests/phpunit/tests/functions/deprecatedFunction.php b/tests/phpunit/tests/functions/deprecatedFunction.php
new file mode 100644
index 0000000000000..b83dfbd46b0a2
--- /dev/null
+++ b/tests/phpunit/tests/functions/deprecatedFunction.php
@@ -0,0 +1,90 @@
+<?php
+
+/**
+ * Tests for the _deprecated_function function.
+ *
+ * @group Functions
+ *
+ * @covers ::__deprecated_function
+ */
+class Tests_Functions_deprecatedFunction extends WP_UnitTestCase {
+
+	/**
+	 * Sets up the test case.
+	 *
+	 * This method is responsible for setting up the test case before each test method is executed.
+	 * It removes certain actions related to deprecated and _deprecated_functionfunctions.
+	 *
+	 * @return void
+	 */
+	public function set_up() {
+		parent::set_up();
+
+		// remove ethe spherical handling for _deprecated_functionin the PHPUnint setup so we can test it
+		remove_action( 'deprecated_function_run', array( $this, 'deprecated_function_run' ), 10, 4 );
+		remove_action( 'deprecated_function_trigger_error', '__return_false' );
+	}
+
+
+	/**
+	 * @ticket 60116
+	 *
+	 * test_deprecated_function_action_called() method tests the action being called when _deprecated_function()
+	 *
+	 * It creates a MockAction object and registers it as a filter for the '_deprecated_function_run' action.
+	 * It then calls __deprecated_function() function with the given 'function_name', 'message', and 1 as arguments.
+	 * Finally, it asserts that the call count of the filter object is equal to 1.
+	 *
+	 * @return void
+	 */
+	public function test_deprecated_function_action_called() {
+		$this->expectDeprecation();
+		$this->expectDeprecationMessage( 'Function function_name is <strong>deprecated</strong> since version 1! Use replacement_function instead.' );
+
+		$action = new MockAction();
+		add_filter( 'deprecated_function_run', array( $action, 'action' ) );
+
+		_deprecated_function( 'function_name', 1, 'replacement_function' );
+
+		$this->assertSame( 1, $action->get_call_count() );
+	}
+
+	/**
+	 * @ticket 60116
+	 *
+	 * This method tests if the '_deprecated_function_trigger_error' filter is called
+	 * when the _deprecated_function() function is invoked.
+	 *
+	 * It creates a mock action object and adds a filter to the '_deprecated_function_trigger_error'
+	 * hook, using the mock action as the callback. Then, it calls the __deprecated_function()
+	 * function with the specified function name, message, and error level.
+	 * Finally, it asserts that the filter callback is called exactly once by checking
+	 * the call count of the mock action object.
+	 *
+	 * @return void
+	 */
+	public function test_deprecated_function_filter_called() {
+		$this->expectDeprecation();
+		$this->expectDeprecationMessage( 'Function function_name is <strong>deprecated</strong> since version 1! Use replacement_function instead.' );
+
+		$filter = new MockAction();
+		add_filter( 'deprecated_function_trigger_error', array( $filter, 'filter' ) );
+
+		_deprecated_function( 'function_name', 1, 'replacement_function' );
+
+		$this->assertSame( 1, $filter->get_call_count() );
+	}
+
+	/**
+	 * @ticket 60116
+	 *
+	 *
+	 * @return void
+	 */
+	public function test_deprecated_function_no_replacement() {
+		$this->expectDeprecation();
+		$this->expectDeprecationMessage( 'Function function_name is <strong>deprecated</strong> since version 1 with no alternative available.' );
+
+		_deprecated_function( 'function_name', 1 );
+	}
+}