Initialize narratio Go module and CLI scaffold

internal/app/commands_test.go

@@ -0,0 +1,75 @@
+package app
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestExecuteValidCommands(t *testing.T) {
+	cases := []struct {
+		name    string
+		args    []string
+		wantOut string
+	}{
+		{name: "run", args: []string{"run"}, wantOut: "narratio run: not yet implemented"},
+		{name: "plan", args: []string{"plan"}, wantOut: "narratio plan: not yet implemented"},
+		{name: "status", args: []string{"status"}, wantOut: "narratio status: not yet implemented"},
+		{name: "resume", args: []string{"resume"}, wantOut: "narratio resume: not yet implemented"},
+		{name: "run-stage", args: []string{"run-stage", "polish"}, wantOut: "narratio run-stage: not yet implemented"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			var stdout bytes.Buffer
+			var stderr bytes.Buffer
+
+			code := Execute(tc.args, &stdout, &stderr)
+			if code != 0 {
+				t.Fatalf("exit code = %d, want 0", code)
+			}
+			if stderr.Len() != 0 {
+				t.Fatalf("stderr = %q, want empty", stderr.String())
+			}
+			if !strings.Contains(stdout.String(), tc.wantOut) {
+				t.Fatalf("stdout = %q, want to contain %q", stdout.String(), tc.wantOut)
+			}
+		})
+	}
+}
+
+func TestExecuteInvalidCommand(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := Execute([]string{"bogus"}, &stdout, &stderr)
+	if code == 0 {
+		t.Fatalf("exit code = 0, want non-zero")
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("stdout = %q, want empty", stdout.String())
+	}
+	out := stderr.String()
+	if !strings.Contains(out, "unknown command") {
+		t.Fatalf("stderr = %q, want unknown command message", out)
+	}
+	if !strings.Contains(out, "Usage: narratio") {
+		t.Fatalf("stderr = %q, want usage message", out)
+	}
+}
+
+func TestExecuteMissingCommand(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := Execute(nil, &stdout, &stderr)
+	if code == 0 {
+		t.Fatalf("exit code = 0, want non-zero")
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("stdout = %q, want empty", stdout.String())
+	}
+	if !strings.Contains(stderr.String(), "Usage: narratio") {
+		t.Fatalf("stderr = %q, want usage message", stderr.String())
+	}
+}