Golang test suite helper (MIT)

suit_test.go

// MIT License
//
// Copyright (c) 2020 Petrukhin Pavel
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

func runSuite(test *testing.T, suite interface{}) {
	var suiteV = reflect.ValueOf(suite)
	var suiteT = reflect.TypeOf(suite)
	var testRun uint
	for i := 0; i < suiteT.NumMethod(); i++ {
		var methodType = suiteT.Method(i)
		if !isSubtest(methodType.Type) {
			continue
		}
		var method = suiteV.Method(i)
		testRun++
		test.Run(methodType.Name, func(test *testing.T) {
			var t = reflect.ValueOf(test)
			method.Call([]reflect.Value{t})
		})
	}
	if testRun == 0 {
		test.Fatalf("no tests to run in the suite")
	}
}

var testType = reflect.TypeOf(new(testing.T))

func isSubtest(method reflect.Type) bool {
	if method.Kind() != reflect.Func {
		return false
	}
	if method.NumIn() != 2 {
		return false
	}
	if method.In(1) != testType {
		return false
	}
	return method.NumOut() == 0
}