public void ClearAllTest()
{
string[] expectedKeys = { "test1", "test2", "test3" };
hashMap.Add("test1", "test3");
hashMap.Add("test2", "test4");
hashMap.Add("test3", "test5");
hashMap.ClearAll();
for (int i = 0; i < expectedKeys.Length; i++)
{
Assert.AreEqual(null, hashMap.GetValue(expectedKeys[i]));
}
}