net: use slices and maps to clean up tests

Replace reflect.DeepEqual with slices.Equal/maps.Equal, which is
much faster.

Change-Id: I54600fb63a56460c11d3d5af9072da585e31b1a2
GitHub-Last-Rev: 08c1445ad5be94d071e8ceb4b060b8f4ab0d77ba
GitHub-Pull-Request: golang/go#67606
Reviewed-on: https://go-review.googlesource.com/c/go/+/587816
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

17 files changed, 53 insertions, 46 deletions

diff --git a/src/net/dnsclient_unix_test.go b/src/net/dnsclient_unix_test.go
index 31677573c0..c4e5194a34 100644
--- a/src/net/dnsclient_unix_test.go
+++ b/src/net/dnsclient_unix_test.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"maps"
 	"os"
 	"path"
 	"path/filepath"
@@ -429,7 +430,7 @@ func TestUpdateResolvConf(t *testing.T) {
 			wg.Wait()
 		}
 		servers := conf.servers()
-		if !reflect.DeepEqual(servers, tt.servers) {
+		if !slices.Equal(servers, tt.servers) {
 			t.Errorf("#%d: got %v; want %v", i, servers, tt.servers)
 			continue
 		}
@@ -1154,7 +1155,7 @@ func testRotate(t *testing.T, rotate bool, nameservers, wantServers []string) {
 		}
 	}
 
-	if !reflect.DeepEqual(usedServers, wantServers) {
+	if !slices.Equal(usedServers, wantServers) {
 		t.Errorf("rotate=%t got used servers:\n%v\nwant:\n%v", rotate, usedServers, wantServers)
 	}
 }
@@ -1433,7 +1434,7 @@ func TestStrictErrorsLookupIP(t *testing.T) {
 					wantIPs[ip] = struct{}{}
 				}
 			}
-			if !reflect.DeepEqual(gotIPs, wantIPs) {
+			if !maps.Equal(gotIPs, wantIPs) {
 				t.Errorf("#%d (%s) strict=%v: got ips %v; want %v", i, tt.desc, strict, gotIPs, wantIPs)
 			}
 		}
@@ -1940,7 +1941,7 @@ func TestPTRandNonPTR(t *testing.T) {
 	if err != nil {
 		t.Fatalf("LookupAddr: %v", err)
 	}
-	if want := []string{"golang.org."}; !reflect.DeepEqual(names, want) {
+	if want := []string{"golang.org."}; !slices.Equal(names, want) {
 		t.Errorf("names = %q; want %q", names, want)
 	}
 }
@@ -2207,14 +2208,14 @@ func TestCVE202133195(t *testing.T) {
 				if err.Error() != expectedErr.Error() {
 					t.Fatalf("unexpected error: %s", err)
 				}
-				if !reflect.DeepEqual(records, expected) {
+				if !slices.Equal(records, expected) {
 					t.Error("Unexpected record set")
 				}
 				records, err = LookupAddr("192.0.2.42")
 				if err.Error() != expectedErr.Error() {
 					t.Fatalf("unexpected error: %s", err)
 				}
-				if !reflect.DeepEqual(records, expected) {
+				if !slices.Equal(records, expected) {
 					t.Error("Unexpected record set")
 				}
 			},
diff --git a/src/net/dnsconfig_unix_test.go b/src/net/dnsconfig_unix_test.go
index 0aae2ba85b..4db1c5a4af 100644
--- a/src/net/dnsconfig_unix_test.go
+++ b/src/net/dnsconfig_unix_test.go
@@ -11,6 +11,7 @@ import (
 	"io/fs"
 	"os"
 	"reflect"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -250,7 +251,7 @@ func TestDNSDefaultSearch(t *testing.T) {
 	for _, tt := range dnsDefaultSearchTests {
 		getHostname = func() (string, error) { return tt.name, tt.err }
 		got := dnsDefaultSearch()
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("dnsDefaultSearch with hostname %q and error %+v = %q, wanted %q", tt.name, tt.err, got, tt.want)
 		}
 	}
diff --git a/src/net/hosts_test.go b/src/net/hosts_test.go
index 5f22920765..2661e79d99 100644
--- a/src/net/hosts_test.go
+++ b/src/net/hosts_test.go
@@ -5,7 +5,7 @@
 package net
 
 import (
-	"reflect"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -73,7 +73,7 @@ func testStaticHost(t *testing.T, hostsPath string, ent staticHostEntry) {
 	ins := []string{ent.in, absDomainName(ent.in), strings.ToLower(ent.in), strings.ToUpper(ent.in)}
 	for _, in := range ins {
 		addrs, _ := lookupStaticHost(in)
-		if !reflect.DeepEqual(addrs, ent.out) {
+		if !slices.Equal(addrs, ent.out) {
 			t.Errorf("%s, lookupStaticHost(%s) = %v; want %v", hostsPath, in, addrs, ent.out)
 		}
 	}
@@ -143,7 +143,7 @@ func testStaticAddr(t *testing.T, hostsPath string, ent staticHostEntry) {
 	for i := range ent.out {
 		ent.out[i] = absDomainName(ent.out[i])
 	}
-	if !reflect.DeepEqual(hosts, ent.out) {
+	if !slices.Equal(hosts, ent.out) {
 		t.Errorf("%s, lookupStaticAddr(%s) = %v; want %v", hostsPath, ent.in, hosts, ent.out)
 	}
 }
diff --git a/src/net/http/cgi/host_test.go b/src/net/http/cgi/host_test.go
index 7fe0e6257d..8ecfa19f6b 100644
--- a/src/net/http/cgi/host_test.go
+++ b/src/net/http/cgi/host_test.go
@@ -16,9 +16,9 @@ import (
 	"net/http/httptest"
 	"os"
 	"path/filepath"
-	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -510,7 +510,7 @@ func TestRemoveLeadingDuplicates(t *testing.T) {
 	}
 	for _, tt := range tests {
 		got := removeLeadingDuplicates(tt.env)
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("removeLeadingDuplicates(%q) = %q; want %q", tt.env, got, tt.want)
 		}
 	}
diff --git a/src/net/http/clientserver_test.go b/src/net/http/clientserver_test.go
index 3dc440dde1..0c2142a063 100644
--- a/src/net/http/clientserver_test.go
+++ b/src/net/http/clientserver_test.go
@@ -274,7 +274,7 @@ func testChunkedResponseHeaders(t *testing.T, mode testMode) {
 	if mode == http2Mode {
 		wantTE = nil
 	}
-	if !reflect.DeepEqual(res.TransferEncoding, wantTE) {
+	if !slices.Equal(res.TransferEncoding, wantTE) {
 		t.Errorf("TransferEncoding = %v; want %v", res.TransferEncoding, wantTE)
 	}
 	if got, haveCL := res.Header["Content-Length"]; haveCL {
diff --git a/src/net/http/fs_test.go b/src/net/http/fs_test.go
index 2ffffbf0b3..3149ca35ac 100644
--- a/src/net/http/fs_test.go
+++ b/src/net/http/fs_test.go
@@ -24,9 +24,9 @@ import (
 	"os/exec"
 	"path"
 	"path/filepath"
-	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
@@ -516,7 +516,7 @@ func testServeFileContentType(t *testing.T, mode testMode) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if h := resp.Header["Content-Type"]; !reflect.DeepEqual(h, want) {
+		if h := resp.Header["Content-Type"]; !slices.Equal(h, want) {
 			t.Errorf("Content-Type mismatch: got %v, want %v", h, want)
 		}
 		resp.Body.Close()
@@ -1448,7 +1448,7 @@ func TestFileServerCleanPath(t *testing.T) {
 		rr := httptest.NewRecorder()
 		req, _ := NewRequest("GET", "http://foo.localhost"+tt.path, nil)
 		FileServer(fileServerCleanPathDir{&log}).ServeHTTP(rr, req)
-		if !reflect.DeepEqual(log, tt.wantOpen) {
+		if !slices.Equal(log, tt.wantOpen) {
 			t.Logf("For %s: Opens = %q; want %q", tt.path, log, tt.wantOpen)
 		}
 		if rr.Code != tt.wantCode {
diff --git a/src/net/http/http_test.go b/src/net/http/http_test.go
index 2e7e024e20..df9812fc94 100644
--- a/src/net/http/http_test.go
+++ b/src/net/http/http_test.go
@@ -12,8 +12,8 @@ import (
 	"io/fs"
 	"net/url"
 	"os"
-	"reflect"
 	"regexp"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -41,7 +41,7 @@ func TestForeachHeaderElement(t *testing.T) {
 		foreachHeaderElement(tt.in, func(v string) {
 			got = append(got, v)
 		})
-		if !reflect.DeepEqual(got, tt.want) {
+		if !slices.Equal(got, tt.want) {
 			t.Errorf("foreachHeaderElement(%q) = %q; want %q", tt.in, got, tt.want)
 		}
 	}
diff --git a/src/net/http/httputil/reverseproxy_test.go b/src/net/http/httputil/reverseproxy_test.go
index eac8b7ec81..67d0e50593 100644
--- a/src/net/http/httputil/reverseproxy_test.go
+++ b/src/net/http/httputil/reverseproxy_test.go
@@ -205,7 +205,7 @@ func TestReverseProxyStripHeadersPresentInConnection(t *testing.T) {
 		slices.Sort(cf)
 		expectedValues := []string{"Upgrade", someConnHeader, fakeConnectionToken}
 		slices.Sort(expectedValues)
-		if !reflect.DeepEqual(cf, expectedValues) {
+		if !slices.Equal(cf, expectedValues) {
 			t.Errorf("handler modified header %q = %q; want %q", "Connection", cf, expectedValues)
 		}
 	}))
@@ -765,7 +765,7 @@ func TestReverseProxyGetPutBuffer(t *testing.T) {
 	wantLog := []string{"getBuf", "putBuf-" + strconv.Itoa(size)}
 	mu.Lock()
 	defer mu.Unlock()
-	if !reflect.DeepEqual(log, wantLog) {
+	if !slices.Equal(log, wantLog) {
 		t.Errorf("Log events = %q; want %q", log, wantLog)
 	}
 }
diff --git a/src/net/http/request_test.go b/src/net/http/request_test.go
index 9b6eb6e1a8..37b888313d 100644
--- a/src/net/http/request_test.go
+++ b/src/net/http/request_test.go
@@ -23,6 +23,7 @@ import (
 	"os"
 	"reflect"
 	"regexp"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -69,22 +70,22 @@ func TestParseFormQuery(t *testing.T) {
 	if bz := req.PostFormValue("z"); bz != "post" {
 		t.Errorf(`req.PostFormValue("z") = %q, want "post"`, bz)
 	}
-	if qs := req.Form["q"]; !reflect.DeepEqual(qs, []string{"foo", "bar"}) {
+	if qs := req.Form["q"]; !slices.Equal(qs, []string{"foo", "bar"}) {
 		t.Errorf(`req.Form["q"] = %q, want ["foo", "bar"]`, qs)
 	}
-	if both := req.Form["both"]; !reflect.DeepEqual(both, []string{"y", "x"}) {
+	if both := req.Form["both"]; !slices.Equal(both, []string{"y", "x"}) {
 		t.Errorf(`req.Form["both"] = %q, want ["y", "x"]`, both)
 	}
 	if prio := req.FormValue("prio"); prio != "2" {
 		t.Errorf(`req.FormValue("prio") = %q, want "2" (from body)`, prio)
 	}
-	if orphan := req.Form["orphan"]; !reflect.DeepEqual(orphan, []string{"", "nope"}) {
+	if orphan := req.Form["orphan"]; !slices.Equal(orphan, []string{"", "nope"}) {
 		t.Errorf(`req.FormValue("orphan") = %q, want "" (from body)`, orphan)
 	}
-	if empty := req.Form["empty"]; !reflect.DeepEqual(empty, []string{"", "not"}) {
+	if empty := req.Form["empty"]; !slices.Equal(empty, []string{"", "not"}) {
 		t.Errorf(`req.FormValue("empty") = %q, want "" (from body)`, empty)
 	}
-	if nokey := req.Form[""]; !reflect.DeepEqual(nokey, []string{"nokey"}) {
+	if nokey := req.Form[""]; !slices.Equal(nokey, []string{"nokey"}) {
 		t.Errorf(`req.FormValue("nokey") = %q, want "nokey" (from body)`, nokey)
 	}
 }
@@ -765,7 +766,7 @@ func TestRequestWriteBufferedWriter(t *testing.T) {
 		"User-Agent: " + DefaultUserAgent + "\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
@@ -785,7 +786,7 @@ func TestRequestBadHostHeader(t *testing.T) {
 		"User-Agent: " + DefaultUserAgent + "\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
@@ -804,7 +805,7 @@ func TestRequestBadUserAgent(t *testing.T) {
 		"User-Agent: evil  X-Evil: evil\r\n",
 		"\r\n",
 	}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Writes = %q\n  Want = %q", got, want)
 	}
 }
diff --git a/src/net/http/serve_test.go b/src/net/http/serve_test.go
index b2858ba8f2..cc485d3b89 100644
--- a/src/net/http/serve_test.go
+++ b/src/net/http/serve_test.go
@@ -34,6 +34,7 @@ import (
 	"reflect"
 	"regexp"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -4010,7 +4011,7 @@ func testHTTP10ConnectionHeader(t *testing.T, mode testMode) {
 		resp.Body.Close()
 
 		got := resp.Header["Connection"]
-		if !reflect.DeepEqual(got, tt.expect) {
+		if !slices.Equal(got, tt.expect) {
 			t.Errorf("wrong Connection headers for request %q. Got %q expect %q", tt.req, got, tt.expect)
 		}
 	}
@@ -4329,7 +4330,7 @@ func testServerConnState(t *testing.T, mode testMode) {
 
 		<-complete
 		sl := <-activeLog
-		if !reflect.DeepEqual(sl.got, sl.want) {
+		if !slices.Equal(sl.got, sl.want) {
 			t.Errorf("Request(s) produced unexpected state sequence.\nGot:  %v\nWant: %v", sl.got, sl.want)
 		}
 		// Don't return sl to activeLog: we don't expect any further states after
@@ -4355,7 +4356,7 @@ func testServerConnState(t *testing.T, mode testMode) {
 				return
 			}
 			sl.got = append(sl.got, state)
-			if sl.complete != nil && (len(sl.got) >= len(sl.want) || !reflect.DeepEqual(sl.got, sl.want[:len(sl.got)])) {
+			if sl.complete != nil && (len(sl.got) >= len(sl.want) || !slices.Equal(sl.got, sl.want[:len(sl.got)])) {
 				close(sl.complete)
 				sl.complete = nil
 			}
diff --git a/src/net/http/sniff_test.go b/src/net/http/sniff_test.go
index d6ef40905e..68c8a6af1e 100644
--- a/src/net/http/sniff_test.go
+++ b/src/net/http/sniff_test.go
@@ -10,7 +10,7 @@ import (
 	"io"
 	"log"
 	. "net/http"
-	"reflect"
+	"slices"
 	"strconv"
 	"strings"
 	"testing"
@@ -144,7 +144,7 @@ func testServerIssue5953(t *testing.T, mode testMode) {
 
 	got := resp.Header["Content-Type"]
 	want := []string{""}
-	if !reflect.DeepEqual(got, want) {
+	if !slices.Equal(got, want) {
 		t.Errorf("Content-Type = %q; want %q", got, want)
 	}
 	resp.Body.Close()
diff --git a/src/net/http/transport_test.go b/src/net/http/transport_test.go
index ae7159dab0..2389284249 100644
--- a/src/net/http/transport_test.go
+++ b/src/net/http/transport_test.go
@@ -36,6 +36,7 @@ import (
 	"os"
 	"reflect"
 	"runtime"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -4453,7 +4454,7 @@ func TestTransportFlushesBodyChunks(t *testing.T) {
 		"5\r\nnum2\n\r\n",
 		"0\r\n\r\n",
 	}
-	if !reflect.DeepEqual(lw.writes, want) {
+	if !slices.Equal(lw.writes, want) {
 		t.Errorf("Writes differed.\n Got: %q\nWant: %q\n", lw.writes, want)
 	}
 }
@@ -5284,7 +5285,7 @@ func testTransportMaxIdleConns(t *testing.T, mode testMode) {
 		"|http|host-2.dns-is-faked.golang:" + port,
 		"|http|host-3.dns-is-faked.golang:" + port,
 	}
-	if got := tr.IdleConnKeysForTesting(); !reflect.DeepEqual(got, want) {
+	if got := tr.IdleConnKeysForTesting(); !slices.Equal(got, want) {
 		t.Fatalf("idle conn keys mismatch.\n got: %q\nwant: %q\n", got, want)
 	}
 
@@ -5296,7 +5297,7 @@ func testTransportMaxIdleConns(t *testing.T, mode testMode) {
 		"|http|host-3.dns-is-faked.golang:" + port,
 		"|http|host-4.dns-is-faked.golang:" + port,
 	}
-	if got := tr.IdleConnKeysForTesting(); !reflect.DeepEqual(got, want) {
+	if got := tr.IdleConnKeysForTesting(); !slices.Equal(got, want) {
 		t.Fatalf("idle conn keys mismatch after 5th host.\n got: %q\nwant: %q\n", got, want)
 	}
 }
diff --git a/src/net/lookup_test.go b/src/net/lookup_test.go
index 7052f3c9fc..d106f98eef 100644
--- a/src/net/lookup_test.go
+++ b/src/net/lookup_test.go
@@ -433,7 +433,7 @@ func TestLookupLongTXT(t *testing.T) {
 		strings.Repeat("abcdefghijklmnopqrstuvwxyABCDEFGHJIKLMNOPQRSTUVWXY", 10),
 		"gophers rule",
 	}
-	if !reflect.DeepEqual(txts, want) {
+	if !slices.Equal(txts, want) {
 		t.Fatalf("LookupTXT golang.rsc.io incorrect\nhave %q\nwant %q", txts, want)
 	}
 }
diff --git a/src/net/lookup_windows_test.go b/src/net/lookup_windows_test.go
index 8f6e4b238f..4f28790185 100644
--- a/src/net/lookup_windows_test.go
+++ b/src/net/lookup_windows_test.go
@@ -144,7 +144,7 @@ func TestNSLookupTXT(t *testing.T) {
 		}
 		slices.Sort(expected)
 		slices.Sort(txt)
-		if !reflect.DeepEqual(expected, txt) {
+		if !slices.Equal(expected, txt) {
 			t.Errorf("different results %s:\texp:%v\tgot:%v", server, toJson(expected), toJson(txt))
 		}
 	})
@@ -170,7 +170,7 @@ func TestLookupLocalPTR(t *testing.T) {
 	}
 	slices.Sort(expected)
 	slices.Sort(names)
-	if !reflect.DeepEqual(expected, names) {
+	if !slices.Equal(expected, names) {
 		t.Errorf("different results %s:\texp:%v\tgot:%v", addr, toJson(expected), toJson(names))
 	}
 }
@@ -201,7 +201,7 @@ func TestLookupPTR(t *testing.T) {
 		}
 		slices.Sort(expected)
 		slices.Sort(names)
-		if !reflect.DeepEqual(expected, names) {
+		if !slices.Equal(expected, names) {
 			t.Errorf("different results %s:\texp:%v\tgot:%v", addr, toJson(expected), toJson(names))
 		}
 	}
diff --git a/src/net/mail/message_test.go b/src/net/mail/message_test.go
index 012d51c3df..dad9c367f3 100644
--- a/src/net/mail/message_test.go
+++ b/src/net/mail/message_test.go
@@ -9,6 +9,7 @@ import (
 	"io"
 	"mime"
 	"reflect"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -115,7 +116,7 @@ func headerEq(a, b Header) bool {
 		if !ok {
 			return false
 		}
-		if !reflect.DeepEqual(as, bs) {
+		if !slices.Equal(as, bs) {
 			return false
 		}
 	}
diff --git a/src/net/resolverdialfunc_test.go b/src/net/resolverdialfunc_test.go
index 9b45cdbcb0..3e8d775266 100644
--- a/src/net/resolverdialfunc_test.go
+++ b/src/net/resolverdialfunc_test.go
@@ -59,7 +59,7 @@ func TestResolverDialFunc(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !reflect.DeepEqual(got, want) {
+		if got, want := sortedIPStrings(ips), []string{"0:200::e00", "1.2.3.4", "1::f", "5.6.7.8"}; !slices.Equal(got, want) {
 			t.Errorf("LookupIP wrong.\n got: %q\nwant: %q\n", got, want)
 		}
 	})
diff --git a/src/net/textproto/reader_test.go b/src/net/textproto/reader_test.go
index f794879bd7..d510f9b338 100644
--- a/src/net/textproto/reader_test.go
+++ b/src/net/textproto/reader_test.go
@@ -11,6 +11,7 @@ import (
 	"net"
 	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"sync"
 	"testing"
@@ -95,13 +96,13 @@ func TestReadDotLines(t *testing.T) {
 	r := reader("dotlines\r\n.foo\r\n..bar\n...baz\nquux\r\n\r\n.\r\nanother\n")
 	s, err := r.ReadDotLines()
 	want := []string{"dotlines", "foo", ".bar", "..baz", "quux", ""}
-	if !reflect.DeepEqual(s, want) || err != nil {
+	if !slices.Equal(s, want) || err != nil {
 		t.Fatalf("ReadDotLines: %v, %v", s, err)
 	}
 
 	s, err = r.ReadDotLines()
 	want = []string{"another"}
-	if !reflect.DeepEqual(s, want) || err != io.ErrUnexpectedEOF {
+	if !slices.Equal(s, want) || err != io.ErrUnexpectedEOF {
 		t.Fatalf("ReadDotLines2: %v, %v", s, err)
 	}
 }
@@ -110,13 +111,13 @@ func TestReadDotBytes(t *testing.T) {
 	r := reader("dotlines\r\n.foo\r\n..bar\n...baz\nquux\r\n\r\n.\r\nanot.her\r\n")
 	b, err := r.ReadDotBytes()
 	want := []byte("dotlines\nfoo\n.bar\n..baz\nquux\n\n")
-	if !reflect.DeepEqual(b, want) || err != nil {
+	if !slices.Equal(b, want) || err != nil {
 		t.Fatalf("ReadDotBytes: %q, %v", b, err)
 	}
 
 	b, err = r.ReadDotBytes()
 	want = []byte("anot.her\n")
-	if !reflect.DeepEqual(b, want) || err != io.ErrUnexpectedEOF {
+	if !slices.Equal(b, want) || err != io.ErrUnexpectedEOF {
 		t.Fatalf("ReadDotBytes2: %q, %v", b, err)
 	}
 }