91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
// Copyright 2017 Frank Schroeder. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package assert provides helper functions for testing.
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package assert
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import (
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"fmt"
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"path/filepath"
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"reflect"
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"regexp"
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"runtime"
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"strings"
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"testing"
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)
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// skip defines the default call depth
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const skip = 2
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// Equal asserts that got and want are equal as defined by
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// reflect.DeepEqual. The test fails with msg if they are not equal.
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func Equal(t *testing.T, got, want interface{}, msg ...string) {
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if x := equal(2, got, want, msg...); x != "" {
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fmt.Println(x)
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t.Fail()
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}
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}
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func equal(skip int, got, want interface{}, msg ...string) string {
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if !reflect.DeepEqual(got, want) {
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return fail(skip, "got %v want %v %s", got, want, strings.Join(msg, " "))
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}
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return ""
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}
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// Panic asserts that function fn() panics.
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// It assumes that recover() either returns a string or
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// an error and fails if the message does not match
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// the regular expression in 'matches'.
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func Panic(t *testing.T, fn func(), matches string) {
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if x := doesPanic(2, fn, matches); x != "" {
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fmt.Println(x)
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t.Fail()
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}
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}
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func doesPanic(skip int, fn func(), expr string) (err string) {
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defer func() {
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r := recover()
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if r == nil {
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err = fail(skip, "did not panic")
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return
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}
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var v string
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switch r.(type) {
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case error:
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v = r.(error).Error()
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case string:
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v = r.(string)
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}
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err = matches(skip, v, expr)
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}()
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fn()
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return ""
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}
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// Matches asserts that a value matches a given regular expression.
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func Matches(t *testing.T, value, expr string) {
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if x := matches(2, value, expr); x != "" {
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fmt.Println(x)
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t.Fail()
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}
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}
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func matches(skip int, value, expr string) string {
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ok, err := regexp.MatchString(expr, value)
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if err != nil {
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return fail(skip, "invalid pattern %q. %s", expr, err)
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}
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if !ok {
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return fail(skip, "got %s which does not match %s", value, expr)
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}
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return ""
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}
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func fail(skip int, format string, args ...interface{}) string {
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_, file, line, _ := runtime.Caller(skip)
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return fmt.Sprintf("\t%s:%d: %s\n", filepath.Base(file), line, fmt.Sprintf(format, args...))
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}
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