public async Task CombineAMiddlewareAndAFuncShouldReturnAFuncThatCombinesThemAsync()
{
// Given
var calls = new List <string>();
AsyncMiddlewareFunc <string, int> func = async(str, _) =>
{
calls.Add("Func");
await Task.CompletedTask;
return(str.Length);
};
AsyncMiddleware <string, int> middleware = async(str, next, ct) =>
{
calls.Add("Before");
var result = await next(str, ct);
calls.Add("After");
return(result);
};
var context = "Hello world!";
// When
var result = await middleware.Combine(func)(context, default);
// Then
result.Should().Be(context.Length);
calls.Should().Equal("Before", "Func", "After");
}
public async Task ConstantShouldAlwaysReturnTheSameGivenAnyInputAndNextAsync(int input, string result, string otherResult)
{
// Given
var middleware = AsyncMiddleware.Constant <int, string>(result);
// When
var actualResult = await middleware(input, (_, _) => Task.FromResult(otherResult), default(CancellationToken));
// Then
actualResult.Should().Be(result);
}
public async Task ConstantFuncWithAResultShouldAlwaysReturnTheSameGivenAnyInputAsync(int input, string result)
{
// Given
var middlewareFunc = AsyncMiddleware.ConstantFunc <int, string>(result);
// When
var actualResult = await middlewareFunc(input, default(CancellationToken));
// Then
actualResult.Should().Be(result);
}