cmd/compile: enable two orphaned tests

These tests weren't being run.  Re-enable them.

R=go1.12

Change-Id: I8d3cd09b7f07e4c39f855ddb9be000718ec86494
Reviewed-on: https://go-review.googlesource.com/127117
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>

src/cmd/compile/internal/gc/testdata/cmp.go → src/cmd/compile/internal/gc/testdata/cmp_test.go

@@ -5,9 +5,7 @@
 // cmp_ssa.go tests compare simplification operations.
 package main
 
-import "fmt"
-
-var failed = false
+import "testing"
 
 //go:noinline
 func eq_ssa(a int64) bool {
@@ -19,30 +17,21 @@ func neq_ssa(a int64) bool {
 	return 10 != a+4
 }
 
-func testCmp() {
+func testCmp(t *testing.T) {
 	if wanted, got := true, eq_ssa(6); wanted != got {
-		fmt.Printf("eq_ssa: expected %v, got %v\n", wanted, got)
-		failed = true
+		t.Errorf("eq_ssa: expected %v, got %v\n", wanted, got)
 	}
 	if wanted, got := false, eq_ssa(7); wanted != got {
-		fmt.Printf("eq_ssa: expected %v, got %v\n", wanted, got)
-		failed = true
+		t.Errorf("eq_ssa: expected %v, got %v\n", wanted, got)
 	}
-
 	if wanted, got := false, neq_ssa(6); wanted != got {
-		fmt.Printf("neq_ssa: expected %v, got %v\n", wanted, got)
-		failed = true
+		t.Errorf("neq_ssa: expected %v, got %v\n", wanted, got)
 	}
 	if wanted, got := true, neq_ssa(7); wanted != got {
-		fmt.Printf("neq_ssa: expected %v, got %v\n", wanted, got)
-		failed = true
+		t.Errorf("neq_ssa: expected %v, got %v\n", wanted, got)
 	}
 }
 
-func main() {
-	testCmp()
-
-	if failed {
-		panic("failed")
-	}
+func TestCmp(t *testing.T) {
+	testCmp(t)
 }

src/cmd/compile/internal/gc/testdata/divbyzero.go → src/cmd/compile/internal/gc/testdata/divbyzero_test.go

 package main
 
 import (
-	"fmt"
 	"runtime"
+	"testing"
 )
 
-var failed = false
-
 func checkDivByZero(f func()) (divByZero bool) {
 	defer func() {
 		if r := recover(); r != nil {
@@ -20,39 +18,31 @@ func checkDivByZero(f func()) (divByZero bool) {
 }
 
 //go:noinline
-func a(i uint, s []int) int {
+func div_a(i uint, s []int) int {
 	return s[i%uint(len(s))]
 }
 
 //go:noinline
-func b(i uint, j uint) uint {
+func div_b(i uint, j uint) uint {
 	return i / j
 }
 
 //go:noinline
-func c(i int) int {
+func div_c(i int) int {
 	return 7 / (i - i)
 }
 
-func main() {
-	if got := checkDivByZero(func() { b(7, 0) }); !got {
-		fmt.Printf("expected div by zero for b(7, 0), got no error\n")
-		failed = true
-	}
-	if got := checkDivByZero(func() { b(7, 7) }); got {
-		fmt.Printf("expected no error for b(7, 7), got div by zero\n")
-		failed = true
+func TestDivByZero(t *testing.T) {
+	if got := checkDivByZero(func() { div_b(7, 0) }); !got {
+		t.Errorf("expected div by zero for b(7, 0), got no error\n")
 	}
-	if got := checkDivByZero(func() { a(4, nil) }); !got {
-		fmt.Printf("expected div by zero for a(4, nil), got no error\n")
-		failed = true
+	if got := checkDivByZero(func() { div_b(7, 7) }); got {
+		t.Errorf("expected no error for b(7, 7), got div by zero\n")
 	}
-	if got := checkDivByZero(func() { c(5) }); !got {
-		fmt.Printf("expected div by zero for c(5), got no error\n")
-		failed = true
+	if got := checkDivByZero(func() { div_a(4, nil) }); !got {
+		t.Errorf("expected div by zero for a(4, nil), got no error\n")
 	}
-
-	if failed {
-		panic("tests failed")
+	if got := checkDivByZero(func() { div_c(5) }); !got {
+		t.Errorf("expected div by zero for c(5), got no error\n")
 	}
 }