public async Task Invoke_HandlesCalledTwice()
{
// arrange
var clacks = new ClacksMiddleware(_onNext);
await clacks.Invoke(_context);
// act
Func <Task> action = () => clacks.Invoke(_context);
// assert
action.ShouldNotThrow("Invoke handled ArgumentException properly");
}
public async Task Invoke_CallsOnNext()
{
// arrange
var clacks = new ClacksMiddleware(_onNext);
// act
await clacks.Invoke(_context);
// assert
_onNextCalledTimes.Should().Be(1, "onNext was called exactly once");
}
public void Invoke_ChecksHttpContextForNull()
{
// arrange
var clacks = new ClacksMiddleware(_onNext);
// act
// ReSharper disable once AssignNullToNotNullAttribute testing the check
Func <Task> action = () => clacks.Invoke(null);
// assert
action.ShouldThrow <ArgumentNullException>("Invoke checked parameter for null");
}
public async Task Invoke_AddsHeader()
{
// arrange
var clacks = new ClacksMiddleware(_onNext);
// act
await clacks.Invoke(_context);
// assert
_context.Response.Headers.Should()
.Contain("X-Clacks-Overhead", new StringValues("GNU Terry Pratchett"),
"purpose of the middleware is to add the header");
}