goutils/assert/assert.go

104 lines
1.9 KiB
Go

// Package assert provides C-like assertions for Go. For more
// information, see assert(3) (e.g. `man 3 assert`).
package assert
import (
"fmt"
"os"
"runtime"
"testing"
)
// NoDebug, if set to true, will cause all asserts to be ignored.
var NoDebug bool
func die(what string) {
_, file, line, ok := runtime.Caller(2)
if !ok {
panic(what)
} else {
fmt.Fprintf(os.Stderr, "%s\n", what)
fmt.Fprintf(os.Stderr, "\t%s line %d\n", file, line)
os.Exit(1)
}
}
// Bool asserts that cond is false.
func Bool(cond bool) {
if NoDebug {
return
}
if !cond {
die("assert.Bool failed")
}
}
// Error asserts that err is nil.
func Error(err error) {
if NoDebug {
return
}
if nil != err {
die(err.Error())
}
}
// Error2 asserts that the actual error is the expected error.
func Error2(expected, actual error) {
if NoDebug || (expected == actual) {
return
}
if expected == nil {
die(fmt.Sprintf("assert.Error2: %s", actual.Error()))
}
var should string
if actual == nil {
should = "no error was returned"
} else {
should = fmt.Sprintf("have '%s'", actual)
}
die(fmt.Sprintf("assert.Error2: expected '%s', but %s", expected, should))
}
// BoolT checks a boolean condition, calling Fatal on t if it is
// false.
func BoolT(t *testing.T, cond bool) {
if !cond {
t.Fatal("assert.Bool failed")
}
}
// ErrorT checks whether the error is nil, calling Fatal on t if it
// isn't.
func ErrorT(t *testing.T, err error) {
if nil != err {
t.Fatalf("%s", err)
}
}
// Error2T compares a pair of errors, calling Fatal on it if they
// don't match.
func Error2T(t *testing.T, expected, actual error) {
if NoDebug || (expected == actual) {
return
}
if expected == nil {
die(fmt.Sprintf("assert.Error2: %s", actual.Error()))
}
var should string
if actual == nil {
should = "no error was returned"
} else {
should = fmt.Sprintf("have '%s'", actual)
}
die(fmt.Sprintf("assert.Error2: expected '%s', but %s", expected, should))
}