UserConfig validation

pkg/config/app_config.go

@@ -164,6 +164,10 @@ func loadUserConfig(configFiles []string, base *UserConfig) (*UserConfig, error)
 		if err := yaml.Unmarshal(content, base); err != nil {
 			return nil, fmt.Errorf("The config at `%s` couldn't be parsed, please inspect it before opening up an issue.\n%w", path, err)
 		}
+
+		if err := base.Validate(); err != nil {
+			return nil, fmt.Errorf("The config at `%s` has a validation error.\n%w", path, err)
+		}
 	}
 
 	return base, nil

pkg/config/user_config_validation.go

@@ -0,0 +1,22 @@
+package config
+
+import (
+	"fmt"
+	"slices"
+	"strings"
+)
+
+func (config *UserConfig) Validate() error {
+	if err := validateEnum("gui.statusPanelView", config.Gui.StatusPanelView, []string{"dashboard", "allBranchesLog"}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func validateEnum(name string, value string, allowedValues []string) error {
+	if slices.Contains(allowedValues, value) {
+		return nil
+	}
+	allowedValuesStr := strings.Join(allowedValues, ", ")
+	return fmt.Errorf("Unexpected value '%s' for '%s'. Allowed values: %s", value, name, allowedValuesStr)
+}

pkg/config/user_config_validation_test.go

@@ -0,0 +1,49 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserConfigValidate_enums(t *testing.T) {
+	type testCase struct {
+		value string
+		valid bool
+	}
+
+	scenarios := []struct {
+		name      string
+		setup     func(config *UserConfig, value string)
+		testCases []testCase
+	}{
+		{
+			name: "Gui.StatusPanelView",
+			setup: func(config *UserConfig, value string) {
+				config.Gui.StatusPanelView = value
+			},
+			testCases: []testCase{
+				{value: "dashboard", valid: true},
+				{value: "allBranchesLog", valid: true},
+				{value: "", valid: false},
+				{value: "invalid_value", valid: false},
+			},
+		},
+	}
+
+	for _, s := range scenarios {
+		t.Run(s.name, func(t *testing.T) {
+			for _, testCase := range s.testCases {
+				config := GetDefaultConfig()
+				s.setup(config, testCase.value)
+				err := config.Validate()
+
+				if testCase.valid {
+					assert.NoError(t, err)
+				} else {
+					assert.Error(t, err)
+				}
+			}
+		})
+	}
+}