adding in logging

vendor/go.uber.org/zap/flag_test.go

@@ -0,0 +1,102 @@
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package zap
+
+import (
+	"flag"
+	"io/ioutil"
+	"testing"
+
+	"go.uber.org/zap/zapcore"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type flagTestCase struct {
+	args      []string
+	wantLevel zapcore.Level
+	wantErr   bool
+}
+
+func (tc flagTestCase) runImplicitSet(t testing.TB) {
+	origCommandLine := flag.CommandLine
+	flag.CommandLine = flag.NewFlagSet("test", flag.ContinueOnError)
+	flag.CommandLine.SetOutput(ioutil.Discard)
+	defer func() { flag.CommandLine = origCommandLine }()
+
+	level := LevelFlag("level", InfoLevel, "")
+	tc.run(t, flag.CommandLine, level)
+}
+
+func (tc flagTestCase) runExplicitSet(t testing.TB) {
+	var lvl zapcore.Level
+	set := flag.NewFlagSet("test", flag.ContinueOnError)
+	set.Var(&lvl, "level", "minimum enabled logging level")
+	tc.run(t, set, &lvl)
+}
+
+func (tc flagTestCase) run(t testing.TB, set *flag.FlagSet, actual *zapcore.Level) {
+	err := set.Parse(tc.args)
+	if tc.wantErr {
+		assert.Error(t, err, "Parse(%v) should fail.", tc.args)
+		return
+	}
+	if assert.NoError(t, err, "Parse(%v) should succeed.", tc.args) {
+		assert.Equal(t, tc.wantLevel, *actual, "Level mismatch.")
+	}
+}
+
+func TestLevelFlag(t *testing.T) {
+	tests := []flagTestCase{
+		{
+			args:      nil,
+			wantLevel: zapcore.InfoLevel,
+		},
+		{
+			args:    []string{"--level", "unknown"},
+			wantErr: true,
+		},
+		{
+			args:      []string{"--level", "error"},
+			wantLevel: zapcore.ErrorLevel,
+		},
+	}
+
+	for _, tt := range tests {
+		tt.runExplicitSet(t)
+		tt.runImplicitSet(t)
+	}
+}
+
+func TestLevelFlagsAreIndependent(t *testing.T) {
+	origCommandLine := flag.CommandLine
+	flag.CommandLine = flag.NewFlagSet("test", flag.ContinueOnError)
+	flag.CommandLine.SetOutput(ioutil.Discard)
+	defer func() { flag.CommandLine = origCommandLine }()
+
+	// Make sure that these two flags are independent.
+	fileLevel := LevelFlag("file-level", InfoLevel, "")
+	consoleLevel := LevelFlag("console-level", InfoLevel, "")
+
+	assert.NoError(t, flag.CommandLine.Parse([]string{"-file-level", "debug"}), "Unexpected flag-parsing error.")
+	assert.Equal(t, InfoLevel, *consoleLevel, "Expected file logging level to remain unchanged.")
+	assert.Equal(t, DebugLevel, *fileLevel, "Expected console logging level to have changed.")
+}