Add build version reporting

internal/cli/command_contract_test.go

@@ -8,6 +8,8 @@ import (
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"gitea.maximumdirect.net/eric/notarius/internal/buildinfo"
 )
 
 func TestCommandHelpSpellingsWriteUsageToStdout(t *testing.T) {
@@ -38,6 +40,7 @@ func TestCommandSyntaxErrorsUseStderrAndExitTwo(t *testing.T) {
 		{name: "unknown pipelines subcommand", args: []string{"pipelines", "unknown"}, want: "unknown pipelines subcommand"},
 		{name: "malformed run flag", args: []string{"run", "demo", "--chunk_cache", "invalid"}, want: "not supported"},
 		{name: "unknown flag", args: []string{"config", "validate", "--unknown"}, want: "flag provided but not defined"},
+		{name: "version arguments", args: []string{"--version", "extra"}, want: "--version does not accept arguments"},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -50,6 +53,33 @@ func TestCommandSyntaxErrorsUseStderrAndExitTwo(t *testing.T) {
 	}
 }
 
+func TestCommandVersionOutput(t *testing.T) {
+	previous := buildinfo.Override
+	t.Cleanup(func() { buildinfo.Override = previous })
+
+	tests := []struct {
+		name       string
+		override   string
+		wantCode   int
+		wantStdout string
+		wantStderr string
+	}{
+		{name: "development", wantStdout: "notarius development\n"},
+		{name: "release override", override: "v1.2.3", wantStdout: "notarius v1.2.3\n"},
+		{name: "invalid override", override: "release", wantCode: 1, wantStderr: "notarius: build version override is not a stable release tag\n"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			buildinfo.Override = tt.override
+			var stdout, stderr bytes.Buffer
+			code := RunWithOptions([]string{"--version"}, &stdout, &stderr, Options{})
+			if code != tt.wantCode || stdout.String() != tt.wantStdout || stderr.String() != tt.wantStderr {
+				t.Fatalf("code=%d stdout=%q stderr=%q", code, stdout.String(), stderr.String())
+			}
+		})
+	}
+}
+
 func TestConfigDiscoveryPrefersExplicitPathThenEnvironment(t *testing.T) {
 	explicit := writeCommandConfig(t, "explicit", "alpha")
 	environment := writeCommandConfig(t, "environment", "beta")