refactor: more current config keys under [miro] table

internal/config/config.go

@@ -14,6 +14,10 @@ type Config struct {
 }
 
 type tomlConfig struct {
+	Miro tomlMiroConfig `toml:"miro"`
+}
+
+type tomlMiroConfig struct {
 	TestDir string `toml:"test_dir"`
 }
 
@@ -28,27 +32,32 @@ func ReadConfig(path string) (Config, error) {
 		}
 		return Config{}, fmt.Errorf("failed to read %s: %v", path, err)
 	}
-	if !meta.IsDefined("test_dir") {
-		return Config{}, fmt.Errorf("failed to read %s: missing required test_dir", path)
+	if !meta.IsDefined("miro") {
+		return Config{}, fmt.Errorf("failed to read %s: missing [miro] config", path)
 	}
-	if raw.TestDir == "" {
-		return Config{}, fmt.Errorf("failed to read %s: empty test_dir", path)
+	if !meta.IsDefined("miro", "test_dir") {
+		return Config{}, fmt.Errorf("failed to read %s: missing required miro.test_dir", path)
+	}
+	if raw.Miro.TestDir == "" {
+		return Config{}, fmt.Errorf("failed to read %s: empty miro.test_dir", path)
 	}
 
 	return Config{
-		TestDir: raw.TestDir,
+		TestDir: raw.Miro.TestDir,
 	}, nil
 }
 
 // WriteConfig writes miro.toml.
 func WriteConfig(path string, cfg Config) error {
 	if cfg.TestDir == "" {
-		return errors.New("empty test_dir")
+		return errors.New("empty miro.test_dir")
 	}
 
 	var buf bytes.Buffer
 	if err := toml.NewEncoder(&buf).Encode(tomlConfig{
-		TestDir: cfg.TestDir,
+		Miro: tomlMiroConfig{
+			TestDir: cfg.TestDir,
+		},
 	}); err != nil {
 		return fmt.Errorf("failed to encode %s: %v", path, err)
 	}

internal/config/config_test.go

@@ -18,27 +18,32 @@ func TestReadConfig(t *testing.T) {
 	}{
 		{
 			name:    "with test dir",
-			content: "test_dir = \"custom/suite\"\n",
+			content: "[miro]\ntest_dir = \"custom/suite\"\n",
 			wantDir: "custom/suite",
 		},
 		{
-			name:    "legacy miro table",
-			content: "[miro]\ntest_dir = \"custom/suite\"\n",
-			wantErr: "missing required test_dir",
+			name:    "legacy top level key",
+			content: "test_dir = \"custom/suite\"\n",
+			wantErr: "missing [miro] config",
+		},
+		{
+			name:    "without miro table",
+			content: "",
+			wantErr: "missing [miro] config",
 		},
 		{
 			name:    "without test dir",
-			content: "",
-			wantErr: "missing required test_dir",
+			content: "[miro]\n",
+			wantErr: "missing required miro.test_dir",
 		},
 		{
 			name:    "empty test dir",
-			content: "test_dir = \"\"\n",
-			wantErr: "empty test_dir",
+			content: "[miro]\ntest_dir = \"\"\n",
+			wantErr: "empty miro.test_dir",
 		},
 		{
 			name:    "invalid toml",
-			content: "test_dir = [\n",
+			content: "[miro]\ntest_dir = [\n",
 			wantErr: "failed to read",
 		},
 		{
@@ -93,8 +98,8 @@ func TestWriteConfig(t *testing.T) {
 	if err != nil {
 		t.Fatalf("ReadFile() error = %v", err)
 	}
-	if string(got) != "test_dir = \"e2e\"\n" {
-		t.Fatalf("config = %q, want %q", string(got), "test_dir = \"e2e\"\n")
+	if string(got) != "[miro]\n  test_dir = \"e2e\"\n" {
+		t.Fatalf("config = %q, want %q", string(got), "[miro]\n  test_dir = \"e2e\"\n")
 	}
 }
 
@@ -105,7 +110,7 @@ func TestWriteConfigEmptyTestDirFails(t *testing.T) {
 	if err == nil {
 		t.Fatal("WriteConfig() error = nil, want error")
 	}
-	if err.Error() != "empty test_dir" {
-		t.Fatalf("WriteConfig() error = %q, want %q", err.Error(), "empty test_dir")
+	if err.Error() != "empty miro.test_dir" {
+		t.Fatalf("WriteConfig() error = %q, want %q", err.Error(), "empty miro.test_dir")
 	}
 }