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want.go
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want.go
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package want
import (
"io/ioutil"
"reflect"
"runtime"
"strings"
"testing"
"github.com/davecgh/go-spew/spew"
"github.com/google/go-cmp/cmp"
"github.com/pmezard/go-difflib/difflib"
)
// displayStringDiff returns if a diff should be displayed as a simple comparison
// of two strings when comparing the value.
func displayStringDiff(v interface{}) bool {
t := reflect.TypeOf(v)
switch t.Kind() {
case reflect.String:
return true
}
return false
}
// displayDumpDiff returns if a diff should be displayed as a spew dump when
// comparing the value.
func displayDumpDiff(v interface{}) bool {
t := reflect.TypeOf(v)
switch t.Kind() {
case reflect.Bool,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
reflect.Float32, reflect.Float64,
reflect.Complex64, reflect.Complex128:
return false
}
return true
}
// Eq compares got to want and reports an error to tb if they are not equal.
// Returns true if equal.
func Eq(tb testing.TB, got, want interface{}) bool {
tb.Helper()
eq := cmp.Equal(got, want)
if eq {
tb.Logf("%s: got %+v", caller(), got)
return eq
}
if displayStringDiff(got) || displayStringDiff(want) {
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(want.(string)),
B: difflib.SplitLines(got.(string)),
FromFile: "Want",
ToFile: "Got",
Context: 3,
}
text, _ := difflib.GetUnifiedDiffString(diff)
tb.Errorf("%s:\n%s", caller(), text)
return eq
}
if displayDumpDiff(got) || displayDumpDiff(want) {
spew := spew.ConfigState{
Indent: " ",
DisableMethods: true,
DisablePointerAddresses: true,
DisableCapacities: true,
SortKeys: true,
SpewKeys: true,
}
gotS := spew.Sdump(got)
wantS := spew.Sdump(want)
diff := difflib.UnifiedDiff{
A: difflib.SplitLines(wantS),
B: difflib.SplitLines(gotS),
FromFile: "Want",
ToFile: "Got",
Context: 3,
}
text, _ := difflib.GetUnifiedDiffString(diff)
tb.Errorf("%s:\n%s", caller(), text)
return eq
}
tb.Errorf("%s: got %+v, want %+v", caller(), got, want)
return eq
}
// NotEq compares got to want and reports an error to tb if they are equal.
// Returns true if not equal.
func NotEq(tb testing.TB, got, notWant interface{}) bool {
tb.Helper()
notEq := !cmp.Equal(got, notWant)
if notEq {
tb.Logf("%s: got %+v, not %+v", caller(), got, notWant)
} else {
tb.Errorf("%s: got %+v, want not %+v", caller(), got, notWant)
}
return notEq
}
// Nil checks if got is nil and reports an error to tb if it is not nil.
// Returns true if nil.
func Nil(tb testing.TB, got interface{}) bool {
tb.Helper()
isNil := got == nil
if isNil {
tb.Logf("%s: got %+v", caller(), got)
} else {
tb.Errorf("%s: got %+v, want <nil>", caller(), got)
}
return isNil
}
// NotNil checks if got is not nil and reports an error to tb if it is nil.
// Returns true if not nil.
func NotNil(tb testing.TB, got interface{}) bool {
tb.Helper()
notNil := got != nil
if notNil {
tb.Logf("%s: got %+v, not <nil>", caller(), got)
} else {
tb.Errorf("%s: got %+v, want not <nil>", caller(), got)
}
return notNil
}
// True checks if got is true and reports an error to tb if it is not true.
// Returns true if true.
func True(tb testing.TB, got bool) bool {
tb.Helper()
isTrue := got
if isTrue {
tb.Logf("%s: got %+v", caller(), got)
} else {
tb.Errorf("%s: got %+v, want true", caller(), got)
}
return isTrue
}
// False checks if got is false and reports an error to tb if it is not false.
// Returns true if false.
func False(tb testing.TB, got bool) bool {
tb.Helper()
isFalse := !got
if isFalse {
tb.Logf("%s: got %+v", caller(), got)
} else {
tb.Errorf("%s: got %+v, want false", caller(), got)
}
return isFalse
}
func caller() string {
skip := 4
callers := [10]uintptr{}
count := runtime.Callers(0, callers[:])
frames := runtime.CallersFrames(callers[:count])
frame := (*runtime.Frame)(nil)
for i := 0; i < skip; i++ {
nextFrame, more := frames.Next()
if !more {
return "_"
}
frame = &nextFrame
}
fileBytes, err := ioutil.ReadFile(frame.File)
if err != nil {
return "_"
}
fileLines := strings.Split(string(fileBytes), "\n")
if frame.Line >= len(fileLines) {
return "_"
}
line := strings.TrimSpace(fileLines[frame.Line-1])
return line
}