v2: App rewritten in Go (#25)

internal/cli/version/command.go

@@ -0,0 +1,24 @@
+// Package version contains CLI `version` command implementation.
+package version
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+
+	"github.com/spf13/cobra"
+)
+
+// NewCommand creates `version` command.
+func NewCommand(ver string) *cobra.Command {
+	return &cobra.Command{
+		Use:     "version",
+		Aliases: []string{"v", "ver"},
+		Short:   "Display application version",
+		RunE: func(*cobra.Command, []string) (err error) {
+			_, err = fmt.Fprintf(os.Stdout, "app version:\t%s (%s)\n", ver, runtime.Version())
+
+			return
+		},
+	}
+}

internal/cli/version/command_test.go

@@ -0,0 +1,30 @@
+package version_test
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/kami-zh/go-capturer"
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/cli/version"
+)
+
+func TestProperties(t *testing.T) {
+	cmd := version.NewCommand("")
+
+	assert.Equal(t, "version", cmd.Use)
+	assert.ElementsMatch(t, []string{"v", "ver"}, cmd.Aliases)
+	assert.NotNil(t, cmd.RunE)
+}
+
+func TestCommandRun(t *testing.T) {
+	cmd := version.NewCommand("1.2.3@foobar")
+	cmd.SetArgs([]string{})
+
+	output := capturer.CaptureStdout(func() {
+		assert.NoError(t, cmd.Execute())
+	})
+
+	assert.Contains(t, output, "1.2.3@foobar")
+	assert.Contains(t, output, runtime.Version())
+}