snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

internal/resolver/delegatingresolver/delegatingresolver_test.go

@@ -0,0 +1,107 @@
+/*
+ *
+ * Copyright 2024 gRPC 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 delegatingresolver
+
+import (
+	"errors"
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"google.golang.org/grpc/internal/grpctest"
+)
+
+type s struct {
+	grpctest.Tester
+}
+
+func Test(t *testing.T) {
+	grpctest.RunSubTests(t, s{})
+}
+
+const targetTestAddr = "test.com"
+
+// overrideHTTPSProxyFromEnvironment function overwrites HTTPSProxyFromEnvironment and
+// returns a function to restore the default values.
+func overrideHTTPSProxyFromEnvironment(hpfe func(req *http.Request) (*url.URL, error)) func() {
+	HTTPSProxyFromEnvironment = hpfe
+	return func() {
+		HTTPSProxyFromEnvironment = nil
+	}
+}
+
+// Tests that the proxyURLForTarget function correctly resolves the proxy URL
+// for a given target address. Tests all the possible output cases.
+func (s) TestproxyURLForTargetEnv(t *testing.T) {
+	err := errors.New("invalid proxy url")
+	tests := []struct {
+		name     string
+		hpfeFunc func(req *http.Request) (*url.URL, error)
+		wantURL  *url.URL
+		wantErr  error
+	}{
+		{
+			name: "valid_proxy_url_and_nil_error",
+			hpfeFunc: func(_ *http.Request) (*url.URL, error) {
+				return &url.URL{
+					Scheme: "https",
+					Host:   "proxy.example.com",
+				}, nil
+			},
+			wantURL: &url.URL{
+				Scheme: "https",
+				Host:   "proxy.example.com",
+			},
+		},
+		{
+			name: "invalid_proxy_url_and_non-nil_error",
+			hpfeFunc: func(_ *http.Request) (*url.URL, error) {
+				return &url.URL{
+					Scheme: "https",
+					Host:   "notproxy.example.com",
+				}, err
+			},
+			wantURL: &url.URL{
+				Scheme: "https",
+				Host:   "notproxy.example.com",
+			},
+			wantErr: err,
+		},
+		{
+			name: "nil_proxy_url_and_nil_error",
+			hpfeFunc: func(_ *http.Request) (*url.URL, error) {
+				return nil, nil
+			},
+			wantURL: nil,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			defer overrideHTTPSProxyFromEnvironment(tt.hpfeFunc)()
+			got, err := proxyURLForTarget(targetTestAddr)
+			if err != tt.wantErr {
+				t.Errorf("parsedProxyURLForProxy(%v) failed with error :%v, want %v\n", targetTestAddr, err, tt.wantErr)
+			}
+			if !cmp.Equal(got, tt.wantURL) {
+				t.Fatalf("parsedProxyURLForProxy(%v) = %v, want %v\n", targetTestAddr, got, tt.wantURL)
+			}
+		})
+	}
+}