diff --git a/misc/ios/go_darwin_arm_exec.go b/misc/ios/go_darwin_arm_exec.go
index 8bedc5dd953..3de341b9c59 100644
--- a/misc/ios/go_darwin_arm_exec.go
+++ b/misc/ios/go_darwin_arm_exec.go
@@ -515,13 +515,11 @@ func copyLocalData(dstbase string) (pkgpath string, err error) {
 
 	// Copy timezone file.
 	//
-	// Typical apps have the zoneinfo.zip in the root of their app bundle,
+	// Apps have the zoneinfo.zip in the root of their app bundle,
 	// read by the time package as the working directory at initialization.
-	// As we move the working directory to the GOROOT pkg directory, we
-	// install the zoneinfo.zip file in the pkgpath.
 	if underGoRoot {
 		err := cp(
-			filepath.Join(dstbase, pkgpath),
+			dstbase,
 			filepath.Join(cwd, "lib", "time", "zoneinfo.zip"),
 		)
 		if err != nil {
diff --git a/src/compress/bzip2/bzip2_test.go b/src/compress/bzip2/bzip2_test.go
index a6c3080db3e..95fb1895856 100644
--- a/src/compress/bzip2/bzip2_test.go
+++ b/src/compress/bzip2/bzip2_test.go
@@ -204,12 +204,6 @@ func TestMTF(t *testing.T) {
 	}
 }
 
-var (
-	digits = mustLoadFile("testdata/e.txt.bz2")
-	twain  = mustLoadFile("testdata/Mark.Twain-Tom.Sawyer.txt.bz2")
-	random = mustLoadFile("testdata/random.data.bz2")
-)
-
 func benchmarkDecode(b *testing.B, compressed []byte) {
 	// Determine the uncompressed size of testfile.
 	uncompressedSize, err := io.Copy(ioutil.Discard, NewReader(bytes.NewReader(compressed)))
@@ -227,6 +221,18 @@ func benchmarkDecode(b *testing.B, compressed []byte) {
 	}
 }
 
-func BenchmarkDecodeDigits(b *testing.B) { benchmarkDecode(b, digits) }
-func BenchmarkDecodeTwain(b *testing.B)  { benchmarkDecode(b, twain) }
-func BenchmarkDecodeRand(b *testing.B)   { benchmarkDecode(b, random) }
+func BenchmarkDecodeDigits(b *testing.B) {
+	digits := mustLoadFile("testdata/e.txt.bz2")
+	b.ResetTimer()
+	benchmarkDecode(b, digits)
+}
+func BenchmarkDecodeTwain(b *testing.B) {
+	twain := mustLoadFile("testdata/Mark.Twain-Tom.Sawyer.txt.bz2")
+	b.ResetTimer()
+	benchmarkDecode(b, twain)
+}
+func BenchmarkDecodeRand(b *testing.B) {
+	random := mustLoadFile("testdata/random.data.bz2")
+	b.ResetTimer()
+	benchmarkDecode(b, random)
+}
diff --git a/src/go/doc/doc_test.go b/src/go/doc/doc_test.go
index ad8ba5378f3..82e63100d47 100644
--- a/src/go/doc/doc_test.go
+++ b/src/go/doc/doc_test.go
@@ -25,7 +25,7 @@ var files = flag.String("files", "", "consider only Go test files matching this
 
 const dataDir = "testdata"
 
-var templateTxt = readTemplate("template.txt")
+var templateTxt *template.Template
 
 func readTemplate(filename string) *template.Template {
 	t := template.New(filename)
@@ -96,6 +96,9 @@ func test(t *testing.T, mode Mode) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	if templateTxt == nil {
+		templateTxt = readTemplate("template.txt")
+	}
 
 	// test packages
 	for _, pkg := range pkgs {
diff --git a/src/go/parser/performance_test.go b/src/go/parser/performance_test.go
index f2732c0e2b1..b2e1c11e9d5 100644
--- a/src/go/parser/performance_test.go
+++ b/src/go/parser/performance_test.go
@@ -10,17 +10,12 @@ import (
 	"testing"
 )
 
-var src = readFile("parser.go")
-
-func readFile(filename string) []byte {
-	data, err := ioutil.ReadFile(filename)
-	if err != nil {
-		panic(err)
-	}
-	return data
-}
-
 func BenchmarkParse(b *testing.B) {
+	src, err := ioutil.ReadFile("parser.go")
+	if err != nil {
+		b.Fatal(err)
+	}
+	b.ResetTimer()
 	b.SetBytes(int64(len(src)))
 	for i := 0; i < b.N; i++ {
 		if _, err := ParseFile(token.NewFileSet(), "", src, ParseComments); err != nil {
diff --git a/src/os/os_test.go b/src/os/os_test.go
index b7300cd38c4..7ad9aac70e2 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -54,12 +54,15 @@ var sysdir = func() *sysDir {
 	case "darwin":
 		switch runtime.GOARCH {
 		case "arm", "arm64":
+			/// At this point the test harness has not had a chance
+			// to move us into the ./src/os directory, so the
+			// current working directory is the root of the app.
 			wd, err := syscall.Getwd()
 			if err != nil {
 				wd = err.Error()
 			}
 			return &sysDir{
-				filepath.Join(wd, "..", ".."),
+				wd,
 				[]string{
 					"ResourceRules.plist",
 					"Info.plist",