public void ContainsKey_GivenNullKey_ThrowsException()
{
// arrange
var sut = new MemoryBackingStore();
// assert
Assert.Throws<ArgumentNullException>(() => sut.ContainsKey(null));
}
public void ContainsKey_GivenNonExistingKey_ReturnsFalse()
{
// arrange
var sut = new MemoryBackingStore();
// act
var containsKey = sut.ContainsKey("someKeyThatDoesn'tExist");
// assert
Assert.That(containsKey, Is.False);
}
[Test] // silently tests MemoryBackingStore.Add as well
public void ContainsKey_GivenExistingKey_ReturnsTrue()
{
// arrange
var sut = new MemoryBackingStore();
sut.Add("ThisKeyExists", new object());
// act
var containsKey = sut.ContainsKey("ThisKeyExists");
// assert
Assert.That(containsKey, Is.True);
}