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levels: return "invalid" for out-of-range Level.String() #120

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levels: return "invalid" for out-of-range Level.String() #120

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3 changes: 3 additions & 0 deletions levels.go
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,9 @@ var levelStrings = map[string]Level{

// String implementation.
func (l Level) String() string {
if l < DebugLevel || int(l) >= len(levelNames) {
return "invalid"
}
return levelNames[l]
}

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27 changes: 27 additions & 0 deletions levels_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -58,3 +58,30 @@ func TestLevel_UnmarshalJSON(t *testing.T) {
assert.NoError(t, err)
assert.Equal(t, InfoLevel, e.Level)
}

func TestLevel_String(t *testing.T) {
cases := []struct {
Level Level
String string
}{
{DebugLevel, "debug"},
{InfoLevel, "info"},
{WarnLevel, "warn"},
{ErrorLevel, "error"},
{FatalLevel, "fatal"},
{InvalidLevel, "invalid"},
{Level(99), "invalid"},
}

for _, c := range cases {
t.Run(c.String, func(t *testing.T) {
assert.Equal(t, c.String, c.Level.String())
})
}
}

func TestLevel_MarshalJSON_Invalid(t *testing.T) {
b, err := json.Marshal(InvalidLevel)
assert.NoError(t, err)
assert.Equal(t, `"invalid"`, string(b))
}