refactor(#154): extract baseSubprocessArgs helper in main_test.go subprocess tests

Reduces duplication across 7 subprocess test functions that repeated the
same set of required flags verbatim. When required flags change, only
baseSubprocessArgs() needs updating.

Changes:
- Add baseSubprocessArgs() helper (analogous to cleanEnv())
- InvalidReviewerName, InvalidTemperature, InvalidProvider,
  ConflictingPersonaFlags: use append(baseSubprocessArgs(), ...)
- InvalidRepo: mutate a copy from baseSubprocessArgs() to set invalid --repo
- InvalidPRNumber: mutate a copy from baseSubprocessArgs() to set invalid --pr
- MissingLLMBaseURL, MissingAICoreCredentials, DeprecatedGiteaURLEnv:
  keep inline args (intentionally omit base flags); add comment explaining why
- All 5 old tests migrated from deprecated --gitea-url to canonical --vcs-url

All subprocess tests pass. go vet clean.

cmd/review-bot/main_test.go

@@ -880,16 +880,9 @@ func TestMainSubprocess_MissingFlags(t *testing.T) {
 func TestMainSubprocess_InvalidReviewerName(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		os.Args = append(baseSubprocessArgs(),
-			"--gitea-url", "http://localhost",
-			"--repo", "owner/repo",
-			"--pr", "1",
 			"--reviewer-name", "invalid name",
-			"--reviewer-token", "tok",
+		)
-			"--llm-base-url", "http://localhost",
-			"--llm-api-key", "key",
-			"--llm-model", "model",
-		}
 		main()
 		return
 	}
@@ -908,15 +901,15 @@ func TestMainSubprocess_InvalidReviewerName(t *testing.T) {
 func TestMainSubprocess_InvalidRepo(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		args := baseSubprocessArgs()
-			"--gitea-url", "http://localhost",
+		// Replace the canonical --repo with an invalid one.
-			"--repo", "invalidrepo",
+		for i, a := range args {
-			"--pr", "1",
+			if a == "owner/repo" {
-			"--reviewer-token", "tok",
+				args[i] = "invalidrepo"
-			"--llm-base-url", "http://localhost",
+				break
-			"--llm-api-key", "key",
+			}
-			"--llm-model", "model",
 		}
+		os.Args = args
 		main()
 		return
 	}
@@ -935,15 +928,15 @@ func TestMainSubprocess_InvalidRepo(t *testing.T) {
 func TestMainSubprocess_InvalidPRNumber(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		args := baseSubprocessArgs()
-			"--gitea-url", "http://localhost",
+		// Replace the canonical --pr value with a non-numeric string.
-			"--repo", "owner/repo",
+		for i, a := range args {
-			"--pr", "notanumber",
+			if a == "1" {
-			"--reviewer-token", "tok",
+				args[i] = "notanumber"
-			"--llm-base-url", "http://localhost",
+				break
-			"--llm-api-key", "key",
+			}
-			"--llm-model", "model",
 		}
+		os.Args = args
 		main()
 		return
 	}
@@ -962,16 +955,9 @@ func TestMainSubprocess_InvalidPRNumber(t *testing.T) {
 func TestMainSubprocess_InvalidTemperature(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		os.Args = append(baseSubprocessArgs(),
-			"--gitea-url", "http://localhost",
-			"--repo", "owner/repo",
-			"--pr", "1",
-			"--reviewer-token", "tok",
-			"--llm-base-url", "http://localhost",
-			"--llm-api-key", "key",
-			"--llm-model", "model",
 			"--llm-temperature", "5.0",
-		}
+		)
 		main()
 		return
 	}
@@ -990,16 +976,9 @@ func TestMainSubprocess_InvalidTemperature(t *testing.T) {
 func TestMainSubprocess_InvalidProvider(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		os.Args = append(baseSubprocessArgs(),
-			"--gitea-url", "http://localhost",
-			"--repo", "owner/repo",
-			"--pr", "1",
-			"--reviewer-token", "tok",
-			"--llm-base-url", "http://localhost",
-			"--llm-api-key", "key",
-			"--llm-model", "model",
 			"--llm-provider", "invalid-provider",
-		}
+		)
 		main()
 		return
 	}
@@ -1015,6 +994,25 @@ func TestMainSubprocess_InvalidProvider(t *testing.T) {
 	}
 }
 
+// baseSubprocessArgs returns the base set of required flags for subprocess tests
+// that need a fully-configured main() invocation. Each test appends its own
+// test-specific flags on top of this base.
+//
+// Using a helper here means that when the set of required flags changes, only
+// this function needs updating (instead of every test that passes all flags).
+func baseSubprocessArgs() []string {
+	return []string{
+		"review-bot",
+		"--vcs-url", "https://gitea.example.com",
+		"--repo", "owner/repo",
+		"--pr", "1",
+		"--reviewer-token", "tok",
+		"--llm-base-url", "https://api.example.com",
+		"--llm-api-key", "key",
+		"--llm-model", "gpt-4",
+	}
+}
+
 // cleanEnv returns environ without any GITEA/LLM/REVIEWER/VCS env vars that would
 // interfere with testing missing-flag scenarios.
 func cleanEnv() []string {
@@ -1389,13 +1387,14 @@ func TestFetchPatterns_MultipleRepos(t *testing.T) {
 func TestMainSubprocess_MissingLLMBaseURL(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+		// Note: cannot use baseSubprocessArgs() here because --llm-base-url and
+		// --llm-api-key are intentionally omitted to test the missing-URL error.
 		os.Args = []string{"review-bot",
 			"--vcs-url", "https://gitea.example.com",
 			"--repo", "owner/repo",
 			"--pr", "1",
 			"--reviewer-token", "tok",
 			"--llm-model", "gpt-4",
-			// --llm-base-url and --llm-api-key intentionally omitted
 		}
 		main()
 		return
@@ -1417,6 +1416,8 @@ func TestMainSubprocess_MissingLLMBaseURL(t *testing.T) {
 func TestMainSubprocess_MissingAICoreCredentials(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+		// Note: cannot use baseSubprocessArgs() here because aicore provider
+		// does not require --llm-base-url / --llm-api-key; those are omitted.
 		os.Args = []string{"review-bot",
 			"--vcs-url", "https://gitea.example.com",
 			"--repo", "owner/repo",
@@ -1446,17 +1447,10 @@ func TestMainSubprocess_MissingAICoreCredentials(t *testing.T) {
 func TestMainSubprocess_ConflictingPersonaFlags(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		os.Args = []string{"review-bot",
+		os.Args = append(baseSubprocessArgs(),
-			"--vcs-url", "https://gitea.example.com",
-			"--repo", "owner/repo",
-			"--pr", "1",
-			"--reviewer-token", "tok",
-			"--llm-base-url", "https://api.example.com",
-			"--llm-api-key", "key",
-			"--llm-model", "gpt-4",
 			"--persona", "security",
 			"--persona-file", "custom.json",
-		}
+		)
 		main()
 		return
 	}
@@ -1477,9 +1471,9 @@ func TestMainSubprocess_ConflictingPersonaFlags(t *testing.T) {
 func TestMainSubprocess_DeprecatedGiteaURLEnv(t *testing.T) {
 	if os.Getenv("TEST_SUBPROCESS_MAIN") == "1" {
 		flag.CommandLine = flag.NewFlagSet(os.Args[0], flag.ExitOnError)
-		// Set required flags but omit --vcs-url; GITEA_URL should be picked up.
+		// Note: cannot use baseSubprocessArgs() here because --vcs-url must be
-		// The test will exit with an error after VCS init (no PR to fetch), but
+		// omitted — this test verifies that GITEA_URL env var is picked up as a
-		// the deprecation warning must appear.
+		// deprecated fallback when --vcs-url is absent.
 		os.Args = []string{"review-bot",
 			// No --vcs-url: should fall back to GITEA_URL env var
 			"--repo", "owner/repo",