public void Lookup_should_use_the_getter_function_to_select_items()
{
var trueSymbolMock = Repository.Create <Symbol>("casper");
var falseSymbolMock = Repository.Create <Symbol>("evelynn");
var cache = new SymbolResultCache <bool>(symbol => symbol.Name == "casper");
cache.Lookup(trueSymbolMock.Object).Should().BeTrue();
cache.Lookup(falseSymbolMock.Object).Should().BeFalse();
}
public void Lookup_allows_exceptions_to_bubble_up()
{
var symbolMock = Repository.Create <Symbol>("casper");
bool throwAnException(Symbol symbol)
{
throw new InvalidOperationException();
}
var cache = new SymbolResultCache <bool>(throwAnException);
cache.Invoking(x => x.Lookup(symbolMock.Object)).Should().Throw <InvalidOperationException>();
}
public void Lookup_should_only_call_the_getter_func_once_per_symbol()
{
var symbol1Mock = Repository.Create <Symbol>("kira");
var symbol2Mock = Repository.Create <Symbol>("indy");
var callCounts = new Dictionary <Symbol, int>
{
[symbol1Mock.Object] = 0,
[symbol2Mock.Object] = 0,
};
bool returnTrueAndIncrementCallCounts(Symbol symbol)
{
callCounts[symbol]++;
return(true);
}
var cache = new SymbolResultCache <bool>(returnTrueAndIncrementCallCounts);
callCounts[symbol1Mock.Object].Should().Be(0);
cache.Lookup(symbol1Mock.Object).Should().BeTrue();
callCounts[symbol1Mock.Object].Should().Be(1);
cache.Lookup(symbol1Mock.Object).Should().BeTrue();
cache.Lookup(symbol1Mock.Object).Should().BeTrue();
cache.Lookup(symbol1Mock.Object).Should().BeTrue();
callCounts[symbol1Mock.Object].Should().Be(1);
callCounts[symbol2Mock.Object].Should().Be(0);
cache.Lookup(symbol2Mock.Object).Should().BeTrue();
callCounts[symbol2Mock.Object].Should().Be(1);
cache.Lookup(symbol2Mock.Object).Should().BeTrue();
cache.Lookup(symbol2Mock.Object).Should().BeTrue();
cache.Lookup(symbol2Mock.Object).Should().BeTrue();
callCounts[symbol2Mock.Object].Should().Be(1);
}