adding tests for the cobra function

Signed-off-by: Christopher Hein <me@chrishein.com>

.travis.yml

@@ -6,5 +6,14 @@ go:
 env:
 - GO111MODULE=on
 
+branches:
+  only:
+  - master
+
+before_install:
+- go get -u golang.org/x/lint/golint
+
 script:
+- make test-fmt
+- make lint
 - make test

Makefile

@@ -1,9 +1,16 @@
 .PHONY: all
 all: build-example test
 
+.PHONY: lint
+lint:
+	@golint -set_exit_status ./...
+
+test-fmt:
+	./hack/test-fmt.sh
+
 .PHONY: test
 test:
-	go test -v ./...
+	@go test -v -race ./...
 
 .PHONY: build-example
 build-example:

example/root.go

@@ -16,82 +16,77 @@ limitations under the License.
 package main
 
 import (
-  "fmt"
-  "os"
-  "github.com/spf13/cobra"
+	"fmt"
+	"os"
 
-  homedir "github.com/mitchellh/go-homedir"
-  "github.com/spf13/viper"
+	"github.com/spf13/cobra"
 
+	homedir "github.com/mitchellh/go-homedir"
+	"github.com/spf13/viper"
 )
 
-
 var cfgFile string
 
-
 // rootCmd represents the base command when called without any subcommands
 var rootCmd = &cobra.Command{
-  Use:   "example",
-  Short: "A brief description of your application",
-  Long: `A longer description that spans multiple lines and likely contains
+	Use:   "example",
+	Short: "A brief description of your application",
+	Long: `A longer description that spans multiple lines and likely contains
 examples and usage of using your application. For example:
 
 Cobra is a CLI library for Go that empowers applications.
 This application is a tool to generate the needed files
 to quickly create a Cobra application.`,
-  // Uncomment the following line if your bare application
-  // has an action associated with it:
-  //	Run: func(cmd *cobra.Command, args []string) { },
+	// Uncomment the following line if your bare application
+	// has an action associated with it:
+	//	Run: func(cmd *cobra.Command, args []string) { },
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
-  if err := rootCmd.Execute(); err != nil {
-    fmt.Println(err)
-    os.Exit(1)
-  }
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
 }
 
 func init() {
-  cobra.OnInitialize(initConfig)
-
-  // Here you will define your flags and configuration settings.
-  // Cobra supports persistent flags, which, if defined here,
-  // will be global for your application.
+	cobra.OnInitialize(initConfig)
 
-  rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.example.yaml)")
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
 
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.example.yaml)")
 
-  // Cobra also supports local flags, which will only run
-  // when this action is called directly.
-  rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+	// Cobra also supports local flags, which will only run
+	// when this action is called directly.
+	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 }
 
-
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
-  if cfgFile != "" {
-    // Use config file from the flag.
-    viper.SetConfigFile(cfgFile)
-  } else {
-    // Find home directory.
-    home, err := homedir.Dir()
-    if err != nil {
-      fmt.Println(err)
-      os.Exit(1)
-    }
-
-    // Search config in home directory with name ".example" (without extension).
-    viper.AddConfigPath(home)
-    viper.SetConfigName(".example")
-  }
-
-  viper.AutomaticEnv() // read in environment variables that match
-
-  // If a config file is found, read it in.
-  if err := viper.ReadInConfig(); err == nil {
-    fmt.Println("Using config file:", viper.ConfigFileUsed())
-  }
+	if cfgFile != "" {
+		// Use config file from the flag.
+		viper.SetConfigFile(cfgFile)
+	} else {
+		// Find home directory.
+		home, err := homedir.Dir()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		// Search config in home directory with name ".example" (without extension).
+		viper.AddConfigPath(home)
+		viper.SetConfigName(".example")
+	}
+
+	viper.AutomaticEnv() // read in environment variables that match
+
+	// If a config file is found, read it in.
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
 }
-

example/version.go

@@ -16,6 +16,8 @@ limitations under the License.
 package main
 
 import (
+	"os"
+
 	"github.com/spf13/cobra"
 	goVersion "go.hein.dev/go-version"
 )
@@ -29,7 +31,7 @@ var (
 		Use:   "version",
 		Short: "Version will output the current build information",
 		Long:  ``,
-		Run:   goVersion.Func(shortened, version, commit, date),
+		Run:   goVersion.Func(os.Stdout, shortened, version, commit, date),
 	}
 )
 

hack/test-fmt.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+test -z $(gofmt -l .)

version.go

@@ -3,6 +3,7 @@ package version // import "go.hein.dev/go-version"
 import (
 	"encoding/json"
 	"fmt"
+	"io"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -25,7 +26,7 @@ func New(version string, commit string, date string) *Info {
 }
 
 // Func will add the versioning code
-func Func(shortened bool, version, commit, date string) func(*cobra.Command, []string) {
+func Func(out io.Writer, shortened bool, version, commit, date string) func(*cobra.Command, []string) {
 	return func(_ *cobra.Command, _ []string) {
 		var response string
 		versionOutput := New(version, commit, date)
@@ -35,7 +36,7 @@ func Func(shortened bool, version, commit, date string) func(*cobra.Command, []s
 		} else {
 			response = versionOutput.ToJSON()
 		}
-		fmt.Printf("%+v", response)
+		fmt.Fprintf(out, "%+v", response)
 		return
 	}
 }

version_test.go

@@ -1,6 +1,11 @@
 package version
 
-import "testing"
+import (
+	"bytes"
+	"testing"
+
+	"github.com/spf13/cobra"
+)
 
 func TestToJSON(t *testing.T) {
 	v := New("dev", "fee8dd1f7c24da23508e26347694be0acce5631b", "Fri Jun 21 10:50:15 PDT 2019")
@@ -25,3 +30,33 @@ Date: Fri Jun 21 10:50:15 PDT 2019
 		t.Errorf("Expected shortened %s to equal %s", short, expected)
 	}
 }
+
+type testcase struct {
+	expected  string
+	shortened bool
+}
+
+func TestFunc(t *testing.T) {
+	cases := []testcase{
+		testcase{
+			expected:  "{\"Version\":\"dev\",\"Commit\":\"fee8dd1f7c24da23508e26347694be0acce5631b\",\"Date\":\"Fri Jun 21 10:50:15 PDT 2019\"}\n",
+			shortened: false,
+		},
+		testcase{
+			expected: `Version: dev
+Commit: fee8dd1f7c24da23508e26347694be0acce5631b
+Date: Fri Jun 21 10:50:15 PDT 2019
+`,
+			shortened: true,
+		},
+	}
+
+	for _, c := range cases {
+		buffer := &bytes.Buffer{}
+		Func(buffer, c.shortened, "dev", "fee8dd1f7c24da23508e26347694be0acce5631b", "Fri Jun 21 10:50:15 PDT 2019")(&cobra.Command{}, []string{})
+		resp := buffer.String()
+		if resp != c.expected {
+			t.Errorf("got %q want %q", resp, c.expected)
+		}
+	}
+}