diff --git a/tests/phpunit/tests/general/deleteGetCalendarCache.php b/tests/phpunit/tests/general/deleteGetCalendarCache.php
new file mode 100644
index 0000000000000..e4dd6b4d84f3e
--- /dev/null
+++ b/tests/phpunit/tests/general/deleteGetCalendarCache.php
@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * Tests for the `delete_get_calendar_cache()` function.
+ *
+ * @group general
+ *
+ * @covers ::delete_get_calendar_cache
+ */
+class Tests_General_DeleteGetCalendarCache extends WP_UnitTestCase {
+
+	/**
+	 * Tests that delete_get_calendar_cache() clears the calendar cache.
+	 *
+	 * @ticket 65819
+	 */
+	public function test_delete_get_calendar_cache_clears_cache() {
+		wp_cache_set( 'get_calendar', array( 'sample_key' => 'calendar_content' ), 'calendar' );
+		$this->assertSame(
+			array( 'sample_key' => 'calendar_content' ),
+			wp_cache_get( 'get_calendar', 'calendar' )
+		);
+
+		delete_get_calendar_cache();
+
+		$this->assertFalse( wp_cache_get( 'get_calendar', 'calendar' ) );
+	}
+
+	/**
+	 * Tests that delete_get_calendar_cache() executes without error when cache does not exist.
+	 *
+	 * @ticket 65819
+	 */
+	public function test_delete_get_calendar_cache_when_empty() {
+		wp_cache_delete( 'get_calendar', 'calendar' );
+
+		delete_get_calendar_cache();
+
+		$this->assertFalse( wp_cache_get( 'get_calendar', 'calendar' ) );
+	}
+}