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Add sync and chainable
Func<Task<T>> assertions
This PR enables you to continue asserting on the result of `Func<Task<int>>` when it does not throw.
```c#
Func<Task<int>> func = () => Task.FromResult(42);
func.Should().NotThrow()
.Which.Should().Be(42);
(await func.Should().NotThrowAsync())
.Which.Should().Be(42);
func.Should().NotThrowAfter(10.Seconds(), 1.Seconds())
.Which.Should().Be(42)
(await func.Should().NotThrowAfterAsync(10.Seconds(), 1.Seconds()))
.Which.Should().Be(42);
```
The implementations and tests are mostly copied from the non-generic or sync versions.
To avoid the redefinitions of `Subject` in each class two changes in generics:
* `DelegateAssertions` and `AsyncFunctionAssertions` are now generic in `TAssertions`.
* `AsyncFunctionAssertions` is also generic in `TTask : Task` to support
both `Task` and `Task<T>` equally.
This fixes fluentassertions#990- Loading branch information
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64 changes: 64 additions & 0 deletions
64
Src/FluentAssertions/Specialized/FunctionAssertionHelpers.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| using System; | ||
| using FluentAssertions.Common; | ||
| using FluentAssertions.Execution; | ||
|
|
||
| namespace FluentAssertions.Specialized | ||
| { | ||
| internal class FunctionAssertionHelpers | ||
| { | ||
| internal static T NotThrow<T>(Func<T> subject, string because, object[] becauseArgs) | ||
| { | ||
| try | ||
| { | ||
| return subject(); | ||
| } | ||
| catch (Exception exception) | ||
| { | ||
| Execute.Assertion | ||
| .ForCondition(exception is null) | ||
| .BecauseOf(because, becauseArgs) | ||
| .FailWith("Did not expect any exception{reason}, but found {0}.", exception); | ||
|
|
||
| return default; | ||
| } | ||
| } | ||
|
|
||
| internal static TResult NotThrowAfter<TResult>(Func<TResult> subject, IClock clock, TimeSpan waitTime, TimeSpan pollInterval, string because, object[] becauseArgs) | ||
| { | ||
| if (waitTime < TimeSpan.Zero) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(waitTime), $"The value of {nameof(waitTime)} must be non-negative."); | ||
| } | ||
|
|
||
| if (pollInterval < TimeSpan.Zero) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(pollInterval), $"The value of {nameof(pollInterval)} must be non-negative."); | ||
| } | ||
|
|
||
| TimeSpan? invocationEndTime = null; | ||
| Exception exception = null; | ||
| ITimer timer = clock.StartTimer(); | ||
|
|
||
| while (invocationEndTime is null || invocationEndTime < waitTime) | ||
| { | ||
| try | ||
| { | ||
| return subject(); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| exception = ex; | ||
| } | ||
|
|
||
| clock.Delay(pollInterval); | ||
| invocationEndTime = timer.Elapsed; | ||
| } | ||
|
|
||
| Execute.Assertion | ||
| .BecauseOf(because, becauseArgs) | ||
| .FailWith("Did not expect any exceptions after {0}{reason}, but found {1}.", waitTime, exception); | ||
|
|
||
| return default; | ||
| } | ||
| } | ||
| } |
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