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