Maintenance: unit tests utils in provider package

internal/provider/utils_test.go

@@ -0,0 +1,54 @@
+package provider
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_pickRandomConnection(t *testing.T) {
+	t.Parallel()
+	connections := []models.OpenVPNConnection{
+		{Port: 1}, {Port: 2}, {Port: 3}, {Port: 4},
+	}
+	source := rand.NewSource(0)
+
+	connection := pickRandomConnection(connections, source)
+	assert.Equal(t, models.OpenVPNConnection{Port: 3}, connection)
+
+	connection = pickRandomConnection(connections, source)
+	assert.Equal(t, models.OpenVPNConnection{Port: 3}, connection)
+
+	connection = pickRandomConnection(connections, source)
+	assert.Equal(t, models.OpenVPNConnection{Port: 2}, connection)
+}
+
+func Test_filterByPossibilities(t *testing.T) {
+	t.Parallel()
+	testCases := map[string]struct {
+		value         string
+		possibilities []string
+		filtered      bool
+	}{
+		"no possibilities": {},
+		"value not in possibilities": {
+			value:         "c",
+			possibilities: []string{"a", "b"},
+			filtered:      true,
+		},
+		"value in possibilities": {
+			value:         "c",
+			possibilities: []string{"a", "b", "c"},
+		},
+	}
+
+	for name, testCase := range testCases {
+		testCase := testCase
+		t.Run(name, func(t *testing.T) {
+			filtered := filterByPossibilities(testCase.value, testCase.possibilities)
+			assert.Equal(t, testCase.filtered, filtered)
+		})
+	}
+}