public void Can_Get_QueryString_From_Hashtable() { // Arrange Hashtable hashtable = new Hashtable(); hashtable.Add("key1", "value1"); hashtable.Add("key2", "value2"); hashtable.Add("key3", "value3"); // Act var queryString = hashtable.ToQueryString(); // Assert Assert.IsNotNull(queryString); Assert.IsInstanceOfType(queryString, typeof(string)); Assert.IsTrue(queryString.Contains("key1=value1")); Assert.IsTrue(queryString.Contains("key2=value2")); Assert.IsTrue(queryString.Contains("key3=value3")); }