Add unit tests for slice utils

pkg/util/slices_utils_test.go

@@ -0,0 +1,104 @@
+/*
+Copyright 2022 The Kruise Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"testing"
+
+	"github.com/openkruise/rollouts/api/v1beta1"
+	"github.com/stretchr/testify/assert"
+	gatewayv1beta1 "sigs.k8s.io/gateway-api/apis/v1beta1"
+)
+
+// stringPointer is a helper to get a pointer to a string literal.
+func stringPointer(s string) *string {
+	return &s
+}
+
+func TestFilterHttpRouteMatch(t *testing.T) {
+	headerMatchType := gatewayv1beta1.HeaderMatchExact
+	pathMatchType := gatewayv1beta1.PathMatchExact
+
+	// Define a sample slice to test against, matching the REAL API structure
+	matches := []v1beta1.HttpRouteMatch{
+		{
+			// Match 0: Canary Header
+			Headers: []gatewayv1beta1.HTTPHeaderMatch{
+				{Name: "canary", Type: &headerMatchType, Value: "true"},
+			},
+		},
+		{
+			// Match 1: Specific Path
+			Path: &gatewayv1beta1.HTTPPathMatch{
+				Type:  &pathMatchType,
+				Value: stringPointer("/api/v1"),
+			},
+		},
+		{
+			// Match 2: Canary Header AND Specific Path
+			Headers: []gatewayv1beta1.HTTPHeaderMatch{
+				{Name: "canary", Type: &headerMatchType, Value: "true"},
+			},
+			Path: &gatewayv1beta1.HTTPPathMatch{
+				Type:  &pathMatchType,
+				Value: stringPointer("/api/v1"),
+			},
+		},
+	}
+
+	testCases := []struct {
+		name           string
+		inputSlice     []v1beta1.HttpRouteMatch
+		filterFunc     func(v1beta1.HttpRouteMatch) bool
+		expectedResult []v1beta1.HttpRouteMatch
+	}{
+		{
+			name:       "Filter for 'canary' header",
+			inputSlice: matches,
+			filterFunc: func(m v1beta1.HttpRouteMatch) bool {
+				for _, h := range m.Headers {
+					if h.Name == "canary" {
+						return true
+					}
+				}
+				return false
+			},
+			expectedResult: []v1beta1.HttpRouteMatch{matches[0], matches[2]},
+		},
+		{
+			name:       "Filter for specific path value",
+			inputSlice: matches,
+			filterFunc: func(m v1beta1.HttpRouteMatch) bool {
+				// Correctly check for nil and dereference the pointer
+				return m.Path != nil && m.Path.Value != nil && *m.Path.Value == "/api/v1"
+			},
+			expectedResult: []v1beta1.HttpRouteMatch{matches[1], matches[2]},
+		},
+		{
+			name:       "Filter that matches nothing",
+			inputSlice: matches,
+			filterFunc: func(m v1beta1.HttpRouteMatch) bool {
+				return false
+			},
+			expectedResult: []v1beta1.HttpRouteMatch{},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := FilterHttpRouteMatch(tc.inputSlice, tc.filterFunc)
+			assert.Equal(t, tc.expectedResult, result)
+		})
+	}
+}