cmd/pinniped: add version command

Signed-off-by: Andrew Keesler <akeesler@vmware.com>

cmd/pinniped/cmd/version.go

@@ -0,0 +1,28 @@
+// Copyright 2020 the Pinniped contributors. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"k8s.io/component-base/version"
+)
+
+//nolint: gochecknoinits
+func init() {
+	rootCmd.AddCommand(newVersionCommand())
+}
+
+func newVersionCommand() *cobra.Command {
+	return &cobra.Command{
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			fmt.Fprintf(cmd.OutOrStdout(), "%#v\n", version.Get())
+			return nil
+		},
+		Args:  cobra.NoArgs, // do not accept positional arguments for this command
+		Use:   "version",
+		Short: "Print the version of this Pinniped CLI",
+	}
+}

cmd/pinniped/cmd/version_test.go

@@ -0,0 +1,85 @@
+// Copyright 2020 the Pinniped contributors. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package cmd
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.pinniped.dev/internal/here"
+)
+
+var (
+	knownGoodUsageRegexpForVersion = here.Doc(`
+		Usage:
+		  version \[flags\]
+
+		Flags:
+		  -h, --help   help for version
+
+		`)
+
+	knownGoodHelpRegexpForVersion = here.Doc(`
+		Print the version of this Pinniped CLI
+
+		Usage:
+		  version \[flags\]
+
+		Flags:
+		  -h, --help   help for version
+		`)
+
+	emptyVersionRegexp = `version.Info{Major:"", Minor:"", GitVersion:".*", GitCommit:".*", GitTreeState:"", BuildDate:".*", GoVersion:".*", Compiler:".*", Platform:".*/.*"}`
+)
+
+func TestNewVersionCmd(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name             string
+		args             []string
+		wantError        bool
+		wantStdoutRegexp string
+		wantStderr       string
+	}{
+		{
+			name:             "no flags",
+			args:             []string{},
+			wantStdoutRegexp: emptyVersionRegexp + "\n",
+		},
+		{
+			name:             "help flag passed",
+			args:             []string{"--help"},
+			wantStdoutRegexp: knownGoodHelpRegexpForVersion,
+		},
+		{
+			name:             "arg passed",
+			args:             []string{"tuna"},
+			wantError:        true,
+			wantStdoutRegexp: `Error: unknown command "tuna" for "version"` + "\n" + knownGoodUsageRegexpForVersion,
+		},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			cmd := newVersionCommand()
+			require.NotNil(t, cmd)
+
+			var stdout, stderr bytes.Buffer
+			cmd.SetOut(&stdout)
+			cmd.SetErr(&stderr)
+			cmd.SetArgs(tt.args)
+			err := cmd.Execute()
+			if tt.wantError {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+			require.Regexp(t, tt.wantStdoutRegexp, stdout.String(), "unexpected stdout")
+			require.Equal(t, tt.wantStderr, stderr.String(), "unexpected stderr")
+		})
+	}
+}