Unit tests for enableFeaturesFromFlags function (#6063)

* - exporting BoolPairs CLI func
- added tests for enableFeaturesFromFlags function

* Add a test that uses a feature flag to add change the outcome of code - and test persistence, as that's the current implementation

Signed-off-by: Sven Dowideit <sven.dowideit@portainer.io>

* Minor comment updates

Co-authored-by: Sven Dowideit <sven.dowideit@portainer.io>
Co-authored-by: Stéphane Busso <stephane.busso@gmail.com>

api/cmd/portainer/main.go

@@ -241,7 +241,7 @@ func updateSettingsFromFlags(dataStore portainer.DataStore, flags *portainer.CLI
 
 // enableFeaturesFromFlags turns on or off feature flags
 // e.g.  portainer --feat open-amt --feat fdo=true ... (defaults to true)
-// note, settins persisted to the DB.  To turn off --feat open-amt=false
+// note, settings are persisted to the DB. To turn off `--feat open-amt=false`
 func enableFeaturesFromFlags(dataStore portainer.DataStore, flags *portainer.CLIFlags) error {
 	settings, err := dataStore.Settings().Settings()
 	if err != nil {

api/cmd/portainer/main_test.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	portainer "github.com/portainer/portainer/api"
+	"github.com/portainer/portainer/api/bolt"
+	"github.com/portainer/portainer/api/cli"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/alecthomas/kingpin.v2"
+)
+
+type mockKingpinSetting string
+
+func (m mockKingpinSetting) SetValue(value kingpin.Value) {
+	value.Set(string(m))
+}
+
+func Test_enableFeaturesFromFlags(t *testing.T) {
+	is := assert.New(t)
+
+	store, teardown := bolt.MustNewTestStore(true)
+	defer teardown()
+
+	tests := []struct {
+		featureFlag string
+		isSupported bool
+	}{
+		{"test", false},
+		{"openamt", false},
+		{"open-amt", true},
+		{"oPeN-amT", true},
+		{"fdo", true},
+		{"FDO", true},
+	}
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%s succeeds:%v", test.featureFlag, test.isSupported), func(t *testing.T) {
+			mockKingpinSetting := mockKingpinSetting(test.featureFlag)
+			flags := &portainer.CLIFlags{FeatureFlags: cli.BoolPairs(mockKingpinSetting)}
+			err := enableFeaturesFromFlags(store, flags)
+			if test.isSupported {
+				is.NoError(err)
+			} else {
+				is.Error(err)
+			}
+		})
+	}
+
+	t.Run("passes for all supported feature flags", func(t *testing.T) {
+		for _, flag := range portainer.SupportedFeatureFlags {
+			mockKingpinSetting := mockKingpinSetting(flag)
+			flags := &portainer.CLIFlags{FeatureFlags: cli.BoolPairs(mockKingpinSetting)}
+			err := enableFeaturesFromFlags(store, flags)
+			is.NoError(err)
+		}
+	})
+}
+
+const FeatTest portainer.Feature = "optional-test"
+
+func optionalFunc(dataStore portainer.DataStore) string {
+
+	// TODO: this is a code smell - finding out if a feature flag is enabled should not require having access to the store, and asking for a settings obj.
+	//       ideally, the `if` should look more like:
+	//       if featureflags.FlagEnabled(FeatTest) {}
+	settings, err := dataStore.Settings().Settings()
+	if err != nil {
+		return err.Error()
+	}
+
+	if settings.FeatureFlagSettings[FeatTest] {
+		return "enabled"
+	}
+	return "disabled"
+}
+
+func Test_optionalFeature(t *testing.T) {
+	portainer.SupportedFeatureFlags = append(portainer.SupportedFeatureFlags, FeatTest)
+
+	is := assert.New(t)
+
+	store, teardown := bolt.MustNewTestStore(true)
+	defer teardown()
+
+	// Enable the test feature
+	t.Run(fmt.Sprintf("%s succeeds:%v", FeatTest, true), func(t *testing.T) {
+		mockKingpinSetting := mockKingpinSetting(FeatTest)
+		flags := &portainer.CLIFlags{FeatureFlags: cli.BoolPairs(mockKingpinSetting)}
+		err := enableFeaturesFromFlags(store, flags)
+		is.NoError(err)
+		is.Equal("enabled", optionalFunc(store))
+	})
+
+	// Same store, so the feature flag should still be enabled
+	t.Run(fmt.Sprintf("%s succeeds:%v", FeatTest, true), func(t *testing.T) {
+		is.Equal("enabled", optionalFunc(store))
+	})
+
+	// disable the test feature
+	t.Run(fmt.Sprintf("%s succeeds:%v", FeatTest, true), func(t *testing.T) {
+		mockKingpinSetting := mockKingpinSetting(FeatTest + "=false")
+		flags := &portainer.CLIFlags{FeatureFlags: cli.BoolPairs(mockKingpinSetting)}
+		err := enableFeaturesFromFlags(store, flags)
+		is.NoError(err)
+		is.Equal("disabled", optionalFunc(store))
+	})
+
+	// Same store, so feature flag should still be disabled
+	t.Run(fmt.Sprintf("%s succeeds:%v", FeatTest, true), func(t *testing.T) {
+		is.Equal("disabled", optionalFunc(store))
+	})
+
+}