public void TestAddOrReplace()
{
var testBiDictionary = new BiDictionary <int, string>();
testBiDictionary.AddOrReplace(0, "Value1");
Assert.Equal("Value1", testBiDictionary[0]);
Assert.Equal(0, testBiDictionary["Value1"]);
testBiDictionary.AddOrReplace(2, "Value10");
Assert.Equal("Value10", testBiDictionary[2]);
Assert.Equal(2, testBiDictionary["Value10"]);
testBiDictionary.AddOrReplace(2, "Value2");
Assert.Equal("Value2", testBiDictionary[2]);
Assert.Equal(2, testBiDictionary["Value2"]);
Assert.Equal(2, testBiDictionary.Firsts.Count);
Assert.Equal(2, testBiDictionary.Seconds.Count);
testBiDictionary.AddOrReplace(3, "Value3");
Assert.Equal("Value3", testBiDictionary[3]);
Assert.Equal(3, testBiDictionary["Value3"]);
testBiDictionary.AddOrReplace(10, "Value3");
Assert.Equal("Value3", testBiDictionary[10]);
Assert.Equal(10, testBiDictionary["Value3"]);
Assert.Equal(3, testBiDictionary.Firsts.Count);
Assert.Equal(3, testBiDictionary.Seconds.Count);
}