public void FormatterChoosesTheBestRuleAndCachesLookups()
{
var mockRule1 = MockRepository.GenerateMock<IFormattingRule>();
var mockRule2 = MockRepository.GenerateMock<IFormattingRule>();
mockRule1.Expect(x => x.GetPriority(typeof(int))).Return(0);
mockRule2.Expect(x => x.GetPriority(typeof(int))).Return(1);
mockRule2.Expect(x => x.Format(null, null)).IgnoreArguments().Repeat.Once().Return("42");
mockRule2.Expect(x => x.Format(null, null)).IgnoreArguments().Repeat.Once().Return("53");
var formatter = new RuleBasedFormatter(new DefaultExtensionPoints(), new[] { mockRule1, mockRule2 });
Assert.AreEqual("42", formatter.Format(42));
Assert.AreEqual("53", formatter.Format(53));
mockRule1.VerifyAllExpectations();
mockRule2.VerifyAllExpectations();
}
public void FormatterSubstitutesNameOfTypeIfRuleThrows()
{
var mockRule = MockRepository.GenerateMock<IFormattingRule>();
mockRule.Expect(x => x.GetPriority(typeof(int))).Return(0);
mockRule.Expect(x => x.Format(null, null)).IgnoreArguments().Throw(new ApplicationException("Boom!"));
var formatter = new RuleBasedFormatter(new DefaultExtensionPoints(), new[] { mockRule });
Assert.AreEqual("{System.Int32}", formatter.Format(42));
mockRule.VerifyAllExpectations();
}
public void FormatterSubstitutesNameOfTypeIfRuleReturnsNullOrEmpty(bool useNull)
{
var mockRule = MockRepository.GenerateMock<IFormattingRule>();
mockRule.Expect(x => x.GetPriority(typeof(int))).Return(0);
mockRule.Expect(x => x.Format(null, null)).IgnoreArguments().Return(useNull ? null : String.Empty);
var formatter = new RuleBasedFormatter(new DefaultExtensionPoints(), new[] { mockRule });
Assert.AreEqual("{System.Int32}", formatter.Format(42));
mockRule.VerifyAllExpectations();
}
public void NullValueProducesStringContainingNull()
{
var mockExtensionPoints = MockRepository.GenerateStub<IExtensionPoints>();
var formatter = new RuleBasedFormatter(mockExtensionPoints, EmptyArray<IFormattingRule>.Instance);
Assert.AreEqual("null", formatter.Format(null));
}
public void Custom_formatting()
{
var extentionPoints = new DefaultExtensionPoints();
var formatter = new RuleBasedFormatter(extentionPoints, EmptyArray<IFormattingRule>.Instance);
extentionPoints.CustomFormatters.Register<Foo>(x => String.Format("Foo's value is {0}.", x.Value));
string output = formatter.Format(new Foo(123));
Assert.AreEqual("Foo's value is 123.", output);
}