public void WithClearDataStoreMustClearAllDataWhenCalled()
{
ContextBuilderFactory.ContextBuilder
.WithData(new DataWithOneMock {
SomeData = "TheData"
});
DataWithOneMock firstPre = _contextBuilder.First <DataWithOneMock>();
DataWithOneMock lastPre = _contextBuilder.Last <DataWithOneMock>();
List <DataWithOneMock> allPre = _contextBuilder.All <DataWithOneMock>().ToList();
_contextBuilder.WithClearDataStore();
MultiAssertForTException.Aggregate <AssertFailedException>(
() => Assert.IsTrue(allPre.Single() == firstPre, "Expected a single piece of data in the data store initially."),
() => Assert.IsTrue(firstPre == lastPre, "Expected the first to be the last in the data store initially."),
() => Assert.ThrowsException <KeyNotFoundException>(() => _contextBuilder.All <DataWithOneMock>(),
"Expected an empty data store after WithClearDataStore.")
);
}