runtime: use slices and maps to clean up tests

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

Also remove some unecessary helper functions.

src/runtime/callers_test.go

@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -80,7 +80,7 @@ func testCallersEqual(t *testing.T, pcs []uintptr, want []string) {
 		}
 		got = append(got, frame.Function)
 	}
-	if !reflect.DeepEqual(want, got) {
+	if !slices.Equal(want, got) {
 		t.Fatalf("wanted %v, got %v", want, got)
 	}
 }

src/runtime/defer_test.go

@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	"runtime"
+	"slices"
 	"testing"
 )
 
@@ -83,7 +83,7 @@ func TestConditionalDefers(t *testing.T) {
 			t.Fatal("expected panic")
 		}
 		want := []int{4, 2, 1}
-		if !reflect.DeepEqual(want, list) {
+		if !slices.Equal(want, list) {
 			t.Fatalf("wanted %v, got %v", want, list)
 		}
 

src/runtime/map_test.go

@@ -144,7 +144,7 @@ func TestMapAppendAssignment(t *testing.T) {
 	m[0] = append(m[0], a...)
 
 	want := []int{12345, 67890, 123, 456, 7, 8, 9, 0}
-	if got := m[0]; !reflect.DeepEqual(got, want) {
+	if got := m[0]; !slices.Equal(got, want) {
 		t.Errorf("got %v, want %v", got, want)
 	}
 }
@@ -533,7 +533,7 @@ func TestMapIterOrder(t *testing.T) {
 			first := ord()
 			ok := false
 			for try := 0; try < 100; try++ {
-				if !reflect.DeepEqual(first, ord()) {
+				if !slices.Equal(first, ord()) {
 					ok = true
 					break
 				}

src/runtime/metrics/description_test.go

@@ -18,7 +18,7 @@ import (
 	"os"
 	"regexp"
 	"runtime/metrics"
-	"sort"
+	"slices"
 	"strings"
 	"testing"
 	_ "unsafe"
@@ -43,7 +43,7 @@ func TestNames(t *testing.T) {
 	}
 
 	names := runtime_readMetricNames()
-	sort.Strings(names)
+	slices.Sort(names)
 	samples := make([]metrics.Sample, len(names))
 	for i, name := range names {
 		samples[i].Name = name

src/runtime/metrics_test.go

@@ -201,10 +201,10 @@ func TestReadMetrics(t *testing.T) {
 	checkUint64(t, "/gc/heap/frees:objects", frees, mstats.Frees-tinyAllocs)
 
 	// Verify that /gc/pauses:seconds is a copy of /sched/pauses/total/gc:seconds
-	if !reflect.DeepEqual(gcPauses.Buckets, schedPausesTotalGC.Buckets) {
+	if !slices.Equal(gcPauses.Buckets, schedPausesTotalGC.Buckets) {
 		t.Errorf("/gc/pauses:seconds buckets %v do not match /sched/pauses/total/gc:seconds buckets %v", gcPauses.Buckets, schedPausesTotalGC.Counts)
 	}
-	if !reflect.DeepEqual(gcPauses.Counts, schedPausesTotalGC.Counts) {
+	if !slices.Equal(gcPauses.Counts, schedPausesTotalGC.Counts) {
 		t.Errorf("/gc/pauses:seconds counts %v do not match /sched/pauses/total/gc:seconds counts %v", gcPauses.Counts, schedPausesTotalGC.Counts)
 	}
 }

src/runtime/pprof/label_test.go

@@ -7,7 +7,8 @@ package pprof
 import (
 	"context"
 	"reflect"
-	"sort"
+	"slices"
+	"strings"
 	"testing"
 )
 
@@ -17,16 +18,10 @@ func labelsSorted(ctx context.Context) []label {
 		ls = append(ls, label{key, value})
 		return true
 	})
-	sort.Sort(labelSorter(ls))
+	slices.SortFunc(ls, func(a, b label) int { return strings.Compare(a.key, b.key) })
 	return ls
 }
 
-type labelSorter []label
-
-func (s labelSorter) Len() int           { return len(s) }
-func (s labelSorter) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
-func (s labelSorter) Less(i, j int) bool { return s[i].key < s[j].key }
-
 func TestContextLabels(t *testing.T) {
 	// Background context starts with no labels.
 	ctx := context.Background()

src/runtime/pprof/runtime_test.go

@@ -7,7 +7,7 @@ package pprof
 import (
 	"context"
 	"fmt"
-	"reflect"
+	"maps"
 	"testing"
 )
 
@@ -15,11 +15,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	sync := make(chan struct{})
 
 	wantLabels := map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty before test, got %v", gotLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("Expected child goroutine's profile labels to be empty before test, got %v", gotLabels)
 		}
 		sync <- struct{}{}
@@ -29,11 +29,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	wantLabels = map[string]string{"key": "value"}
 	ctx := WithLabels(context.Background(), Labels("key", "value"))
 	SetGoroutineLabels(ctx)
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("parent goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("child goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 		}
 		sync <- struct{}{}
@@ -43,11 +43,11 @@ func TestSetGoroutineLabels(t *testing.T) {
 	wantLabels = map[string]string{}
 	ctx = context.Background()
 	SetGoroutineLabels(ctx)
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty, got %v", gotLabels)
 	}
 	go func() {
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("Expected child goroutine's profile labels to be empty, got %v", gotLabels)
 		}
 		sync <- struct{}{}
@@ -57,20 +57,20 @@ func TestSetGoroutineLabels(t *testing.T) {
 
 func TestDo(t *testing.T) {
 	wantLabels := map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		t.Errorf("Expected parent goroutine's profile labels to be empty before Do, got %v", gotLabels)
 	}
 
 	Do(context.Background(), Labels("key1", "value1", "key2", "value2"), func(ctx context.Context) {
 		wantLabels := map[string]string{"key1": "value1", "key2": "value2"}
-		if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+		if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 			t.Errorf("parent goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 		}
 
 		sync := make(chan struct{})
 		go func() {
 			wantLabels := map[string]string{"key1": "value1", "key2": "value2"}
-			if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+			if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 				t.Errorf("child goroutine's profile labels: got %v, want %v", gotLabels, wantLabels)
 			}
 			sync <- struct{}{}
@@ -80,7 +80,7 @@ func TestDo(t *testing.T) {
 	})
 
 	wantLabels = map[string]string{}
-	if gotLabels := getProfLabel(); !reflect.DeepEqual(gotLabels, wantLabels) {
+	if gotLabels := getProfLabel(); !maps.Equal(gotLabels, wantLabels) {
 		fmt.Printf("%#v", gotLabels)
 		fmt.Printf("%#v", wantLabels)
 		t.Errorf("Expected parent goroutine's profile labels to be empty after Do, got %v", gotLabels)

src/runtime/profbuf_test.go

@@ -5,8 +5,8 @@
 package runtime_test
 
 import (
-	"reflect"
 	. "runtime"
+	"slices"
 	"testing"
 	"time"
 	"unsafe"
@@ -20,7 +20,7 @@ func TestProfBuf(t *testing.T) {
 	}
 	read := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) {
 		rdata, rtags, eof := b.Read(ProfBufNonBlocking)
-		if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) {
+		if !slices.Equal(rdata, data) || !slices.Equal(rtags, tags) {
 			t.Fatalf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x", rdata, data, rtags, tags)
 		}
 		if eof {
@@ -32,7 +32,7 @@ func TestProfBuf(t *testing.T) {
 		go func() {
 			eof := data == nil
 			rdata, rtags, reof := b.Read(ProfBufBlocking)
-			if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) || reof != eof {
+			if !slices.Equal(rdata, data) || !slices.Equal(rtags, tags) || reof != eof {
 				// Errorf, not Fatalf, because called in goroutine.
 				t.Errorf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x\nhave eof=%v, want %v", rdata, data, rtags, tags, reof, eof)
 			}

src/runtime/race/sched_test.go

@@ -8,8 +8,8 @@ package race_test
 
 import (
 	"fmt"
-	"reflect"
 	"runtime"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -35,7 +35,7 @@ func TestRandomScheduling(t *testing.T) {
 	}
 
 	for i := 0; i < N; i++ {
-		if !reflect.DeepEqual(out[0], out[i]) {
+		if !slices.Equal(out[0], out[i]) {
 			return // found a different order
 		}
 	}