public void ComposingMiddlewaresShouldProducesACompositeMiddleware()
{
// Given
var calls = new List <string>();
VoidSyncMiddlewareFunc <string> func = str =>
{
calls.Add("Func");
};
VoidSyncMiddleware <string> MakeMiddleware(int count)
{
return((str, next) =>
{
calls !.Add("Before" + count);
next(str);
calls.Add("After" + count);
});
}
var middleware1 = MakeMiddleware(1);
var middleware2 = MakeMiddleware(2);
var middleware3 = MakeMiddleware(3);
var context = "Hello world!";
// When
var middleware = middleware1.Compose(middleware2, middleware3);
func.Combine(middleware)(context);
// Then
calls.Should().Equal("Before1", "Before2", "Before3", "Func", "After3", "After2", "After1");
}
public void CombineAMiddlewareAndAFuncShouldReturnAFuncThatCombinesThem()
{
// Given
var calls = new List <string>();
VoidSyncMiddlewareFunc <string> func = str =>
{
calls.Add($"Func: {str}");
};
VoidSyncMiddleware <string> middleware = (str, next) =>
{
calls.Add($"Before: {str}");
next(str);
calls.Add($"After: {str}");
};
var context = "Hello";
// When
middleware.Combine(func)(context);
// Then
calls.Should().Equal("Before: Hello", "Func: Hello", "After: Hello");
}
public static VoidSyncMiddlewareFunc <TContext> Combine <TContext>(
this VoidSyncMiddleware <TContext> middleware,
VoidSyncMiddlewareFunc <TContext> func) =>
context => middleware(context, func);
