public void Returns_False_If_ExceptionIsThrown()
{
int result;
var success = TryUtility.Try(FakeBuilder.FuncThrows <int>(), out result);
success.Should().Be(false);
}
public void TryFailureWithNotOutputSupportsChaining()
{
const string errorMessage = "Something went wrong";
double value = 10;
var tryFailure = TryUtility.CreateTryFailure(new Exception(errorMessage));
var try1 = TryUtility.Chain(tryFailure, () =>
{
value = value / 4;
return(TryUtility.CreateTrySuccessful());
});
var try2 = TryUtility.Chain(try1, () =>
{
value = value * 2;
return(TryUtility.CreateTrySuccessful());
});
var try3 = TryUtility.Chain(try2, () =>
{
value = value + 15;
return(TryUtility.CreateTrySuccessful());
});
Func <string> successHandler = () => value.ToString();
Func <Exception, string> failureHandler = ex => ex.Message;
var output = try3.Check(successHandler, failureHandler);
Assert.AreEqual(errorMessage, output);
}
public void Returns_Default_If_ExceptionIsThrown()
{
int result;
TryUtility.Try(FakeBuilder.FuncThrows <int>(), out result);
result.Should().Be(default(int));
}
public void Returns_True_If_NoExceptionIsThrown()
{
int result;
var success = TryUtility.Try(FakeBuilder.FuncDoesNotThrow <int>(), out result);
success.Should().Be(true);
}
public void TrySuccessfulWithNoOutputSupportsChaining()
{
double value = 10;
var trySuccessful = TryUtility.CreateTrySuccessful();
var try1 = TryUtility.Chain(trySuccessful, () =>
{
value = value / 4;
return(TryUtility.CreateTrySuccessful());
});
var try2 = TryUtility.Chain(try1, () =>
{
value = value * 2;
return(TryUtility.CreateTrySuccessful());
});
var try3 = TryUtility.Chain(try2, () =>
{
value = value + 15;
return(TryUtility.CreateTrySuccessful());
});
Func <string> successHandler = () => value.ToString();
Func <Exception, string> failureHandler = ex => ex.Message;
var output = try3.Check(successHandler, failureHandler);
Assert.AreEqual("20", output);
}
public void TrySuccessfulInitialises()
{
int successfulValue = 1;
var trySuccessful = TryUtility.CreateTrySuccessful <int>(successfulValue);
Assert.IsNotNull(trySuccessful);
}
public void Returns_Value_If_NoExceptionIsThrown(
[Frozen] IFixture fixture)
{
int result;
TryUtility.Try(FakeBuilder.FuncDoesNotThrow <int>(fixture), out result);
result.Should().Be(fixture.Create <int>());
}
public void TryFailureInitialises()
{
Exception error = new Exception();
var tryFailure = TryUtility.CreateTryFailure <int>(error);
Assert.IsNotNull(tryFailure);
}
public Try(Func <TResult> function) : base()
{
Results = new TryResult <object> [1];
TResult resultObject;
Success = TryUtility.Try(function, out resultObject);
Results[0] = new TryResult <object>(resultObject, Success);
}
public void DoesNotThrow()
{
try
{
TryUtility.Try(FakeBuilder.ActionThrows());
}
catch
{
Assert.True(false, "Expected no exception from TryUtility, but got one");
}
}
public void DoesNotThrow()
{
try
{
int result;
TryUtility.Try(FakeBuilder.FuncThrows <int>(), out result);
}
catch
{
Assert.True(false, "Expected no exception from TryUtility, but got one");
}
}
public void TrySuccessfulWithNotOutputInvokesSuccessFunc()
{
const string expectedOutput = "Success";
var trySuccessful = TryUtility.CreateTrySuccessful();
Func <string> successHandler = () => expectedOutput;
Func <Exception, string> failureHandler = e => e.Message;
var output = trySuccessful.Check(successHandler, failureHandler);
Assert.AreEqual(expectedOutput, output);
}
public void TrySuccessfulInvokesSuccessAction()
{
int count = 10;
int successfulValue = 1;
var trySuccessful = TryUtility.CreateTrySuccessful <int>(successfulValue);
Action <int> successHandler = i => count = count + i;
Action <Exception> failureHandler = i => count = count - 1;
trySuccessful.Check(successHandler, failureHandler);
Assert.AreEqual(11, count);
}
public void TrySuccessInvokesSuccessFunc()
{
int successfulValue = 1;
var trySuccessful = TryUtility.CreateTrySuccessful <int>(successfulValue);
Func <int, string> successHandler = i => i.ToString();
Func <Exception, string> failureHandler = e => e.Message;
var output = trySuccessful.Check(successHandler, failureHandler);
Assert.AreEqual("1", output);
}
public void TryFailureWithNoOutputInvokesFailedAction()
{
int count = 10;
var tryFailure = TryUtility.CreateTryFailure(new Exception());
Action successHandler = () => count = count + 1;
Action <Exception> failureHandler = e => count = count - 1;
tryFailure.Check(successHandler, failureHandler);
Assert.AreEqual(9, count);
}
public void TrySuccessfulWithNotOutputInvokesSuccessAction()
{
int count = 10;
var trySuccessful = TryUtility.CreateTrySuccessful();
Action successHandler = () => count = count + 1;
Action <Exception> failureHandler = e => count = count - 1;
trySuccessful.Check(successHandler, failureHandler);
Assert.AreEqual(11, count);
}
public void TryFailureInvokesFailedAction()
{
int count = 10;
Exception error = new Exception();
var tryFailure = TryUtility.CreateTryFailure <int>(error);
Action <int> successHandler = i => count = count + i;
Action <Exception> failureHandler = i => count = count - 1;
tryFailure.Check(successHandler, failureHandler);
Assert.AreEqual(9, count);
}
public void TryFailureWithNoOutputInvokesFailedFunc()
{
const string expectedOutput = "foo";
Exception error = new Exception(expectedOutput);
var tryFailure = TryUtility.CreateTryFailure(error);
Func <string> successHandler = () => expectedOutput;
Func <Exception, string> failureHandler = e => e.Message;
var output = tryFailure.Check(successHandler, failureHandler);
Assert.AreEqual(expectedOutput, output);
}
public void TryFailureInvokesFailedFunc()
{
const string errorMessage = "foo";
Exception error = new Exception(errorMessage);
var tryFailure = TryUtility.CreateTryFailure <int>(error);
Func <int, string> successHandler = i => i.ToString();
Func <Exception, string> failureHandler = e => e.Message;
var output = tryFailure.Check(successHandler, failureHandler);
Assert.AreEqual("foo", output);
}
public void TrySuccessfulMonadSupportsChaining()
{
int originalValue = 10;
var trySuccessful = TryUtility.CreateTrySuccessful(originalValue);
var try1 = TryUtility.Chain <int, double>(trySuccessful, i => (double)i / 4); // 2.5
var try2 = TryUtility.Chain <double, int>(try1, d => (int)(d * 2)); // 5
var try3 = TryUtility.Chain <int, string>(try2, i => i.ToString()); //"5"
Func <string, string> successHandler = s => s;
Func <Exception, string> errorHandler = e => e.Message;
var output = try3.Check(successHandler, errorHandler);
Assert.AreEqual("5", output);
}
public void TryFailureMonadSupportChaining()
{
const string errorMessage = "Something went wrong";
Exception error = new Exception(errorMessage);
var tryFailure = TryUtility.CreateTryFailure <int>(error);
var try1 = TryUtility.Chain <int, double>(tryFailure, i => (double)i / 4);
var try2 = TryUtility.Chain <double, int>(try1, d => (int)(d * 2));
var try3 = TryUtility.Chain <int, string>(try2, i => i.ToString());
Func <string, string> successHandler = s => s;
Func <Exception, string> errorHandler = e => e.Message;
var output = try3.Check(successHandler, errorHandler);
Assert.AreEqual(errorMessage, output);
}
public void Returns_False_If_ExceptionIsThrown()
{
var success = TryUtility.Try(FakeBuilder.ActionThrows());
success.Should().Be(false);
}
public void Returns_True_If_NoExceptionIsThrown()
{
var success = TryUtility.Try(FakeBuilder.ActionDoesNotThrow());
success.Should().Be(true);
}
public void TrySuccessfulWithNoOutputInitialises()
{
var trySuccessful = TryUtility.CreateTrySuccessful();
Assert.IsNotNull(trySuccessful);
}
public void TryFailureWithNotOutputInitialises()
{
var tryFailure = TryUtility.CreateTryFailure(new Exception());
Assert.IsNotNull(tryFailure);
}
public static bool Tries <TResult>(this object obj, Func <TResult> function, out TResult result)
{
return(TryUtility.Try(function, out result));
}
public Try(Action action)
{
Results = new TryResult[1];
Results[0] = new TryResult(TryUtility.Try(action));
}
public static bool Tries(this object obj, Action action)
{
return(TryUtility.Try(action));
}