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testutil: Improved trimming when output is too large. #5

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merged 1 commit into from
Dec 15, 2022
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testutil: Improved trimming when output is too large. #5

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47 changes: 25 additions & 22 deletions testutil/testutil.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,16 @@ import (
"github.com/google/go-cmp/cmp"
)

const limitOfElemChars = 1e3

func withLimitf(f string, v ...interface{}) string {
s := fmt.Sprintf(f, v...)
if len(s) > limitOfElemChars {
return s[:limitOfElemChars] + "...(output trimmed)"
}
return s
}

// Assert fails the test if the condition is false.
func Assert(tb testing.TB, condition bool, v ...interface{}) {
tb.Helper()
Expand All @@ -29,7 +39,7 @@ func Assert(tb testing.TB, condition bool, v ...interface{}) {
if len(v) > 0 {
msg = fmt.Sprintf(v[0].(string), v[1:]...)
}
tb.Fatalf("\033[31m%s:%d: "+msg+"\033[39m\n\n", filepath.Base(file), line)
tb.Fatalf("\033[31m%s:%d: \"%s\"\033[39m\n\n", filepath.Base(file), line, withLimitf(msg))
}

// Ok fails the test if an err is not nil.
Expand All @@ -44,7 +54,7 @@ func Ok(tb testing.TB, err error, v ...interface{}) {
if len(v) > 0 {
msg = fmt.Sprintf(v[0].(string), v[1:]...)
}
tb.Fatalf("\033[31m%s:%d:"+msg+"\n\n unexpected error: %s\033[39m\n\n", filepath.Base(file), line, err.Error())
tb.Fatalf("\033[31m%s:%d: \"%s\"\n\n unexpected error: %s\033[39m\n\n", filepath.Base(file), line, withLimitf(msg), withLimitf(err.Error()))
}

// NotOk fails the test if an err is nil.
Expand All @@ -59,7 +69,7 @@ func NotOk(tb testing.TB, err error, v ...interface{}) {
if len(v) > 0 {
msg = fmt.Sprintf(v[0].(string), v[1:]...)
}
tb.Fatalf("\033[31m%s:%d:"+msg+"\n\n expected error, got nothing \033[39m\n\n", filepath.Base(file), line)
tb.Fatalf("\033[31m%s:%d: \"%s\"\n\n expected error, got nothing \033[39m\n\n", filepath.Base(file), line, withLimitf(msg))
}

// Equals fails the test if exp is not equal to act.
Expand All @@ -68,13 +78,20 @@ func Equals(tb testing.TB, exp, act interface{}, v ...interface{}) {
if reflect.DeepEqual(exp, act) {
return
}
_, file, line, _ := runtime.Caller(1)
fatalNotEqual(tb, exp, act, v...)
}

func fatalNotEqual(tb testing.TB, exp, act interface{}, v ...interface{}) {
_, file, line, _ := runtime.Caller(2)

var msg string
if len(v) > 0 {
msg = fmt.Sprintf(v[0].(string), v[1:]...)
}
tb.Fatal(sprintfWithLimit("\033[31m%s:%d:"+msg+"\n\n\texp: %#v\n\n\tgot: %#v%s\033[39m\n\n", filepath.Base(file), line, exp, act, diff(exp, act)))
tb.Fatalf(
"\033[31m%s:%d: \"%s\"\n\n\texp: %s\n\n\tgot: %s%s\033[39m\n\n",
filepath.Base(file), line, withLimitf(msg), withLimitf("%#v", exp), withLimitf("%#v", act), withLimitf(diff(exp, act)),
)
}

type goCmp struct {
Expand All @@ -83,7 +100,7 @@ type goCmp struct {

// WithGoCmp allows specifying options and using https://github.com/google/go-cmp
// for equality comparisons. The compatibility guarantee of this function's arguments
// are the same as go-cmp i.e none due to v0.x.
// are the same as go-cmp (no guarantee due to v0.x).
func WithGoCmp(opts ...cmp.Option) goCmp {
return goCmp{opts: opts}
}
Expand All @@ -95,13 +112,7 @@ func (o goCmp) Equals(tb testing.TB, exp, act interface{}, v ...interface{}) {
if cmp.Equal(exp, act, o.opts) {
return
}
_, file, line, _ := runtime.Caller(1)

var msg string
if len(v) > 0 {
msg = fmt.Sprintf(v[0].(string), v[1:]...)
}
tb.Fatal(sprintfWithLimit("\033[31m%s:%d:"+msg+"\n\n\texp: %#v\n\n\tgot: %#v%s\033[39m\n\n", filepath.Base(file), line, exp, act, diff(exp, act)))
fatalNotEqual(tb, exp, act, v...)
}

// FaultOrPanicToErr returns error if panic of fault was triggered during execution of function.
Expand All @@ -126,7 +137,7 @@ func ContainsStringSlice(tb testing.TB, haystack, needle []string) {
_, file, line, _ := runtime.Caller(1)

if !contains(haystack, needle) {
tb.Fatalf(sprintfWithLimit("\033[31m%s:%d: %#v does not contain %#v\033[39m\n\n", filepath.Base(file), line, haystack, needle))
tb.Fatalf("\033[31m%s:%d: %s does not contain %s\033[39m\n\n", filepath.Base(file), line, withLimitf("%#v", haystack), withLimitf("%#v", needle))
}
}

Expand Down Expand Up @@ -166,14 +177,6 @@ func contains(haystack, needle []string) bool {
return false
}

func sprintfWithLimit(act string, v ...interface{}) string {
s := fmt.Sprintf(act, v...)
if len(s) > 10000 {
return s[:10000] + "...(output trimmed)"
}
return s
}

func typeAndKind(v interface{}) (reflect.Type, reflect.Kind) {
t := reflect.TypeOf(v)
k := t.Kind()
Expand Down
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