cleanup: fixes for issues surfaced by vet (#5617)

balancer/rls/balancer_test.go

@@ -886,9 +886,7 @@ func (w *wrappingTopLevelBalancer) getStates() []balancer.State {
 	defer w.mu.Unlock()
 
 	states := make([]balancer.State, len(w.states))
-	for i, s := range w.states {
-		states[i] = s
-	}
+	copy(states, w.states)
 	return states
 }
 

credentials/alts/internal/conn/record_test.go

@@ -220,7 +220,7 @@ func testFrameTooLarge(t *testing.T, rp string) {
 	payload := make([]byte, payloadLen)
 	c, err := clientConn.crypto.Encrypt(nil, payload)
 	if err != nil {
-		t.Fatalf(fmt.Sprintf("Error encrypting message: %v", err))
+		t.Fatalf("Error encrypting message: %v", err)
 	}
 	msgLen := msgTypeFieldSize + len(c)
 	framedMsg := make([]byte, MsgLenFieldSize+msgLen)
@@ -229,7 +229,7 @@ func testFrameTooLarge(t *testing.T, rp string) {
 	binary.LittleEndian.PutUint32(msg[:msgTypeFieldSize], altsRecordMsgType)
 	copy(msg[msgTypeFieldSize:], c)
 	if _, err = buf.Write(framedMsg); err != nil {
-		t.Fatal(fmt.Sprintf("Unexpected error writing to buffer: %v", err))
+		t.Fatalf("Unexpected error writing to buffer: %v", err)
 	}
 	b := make([]byte, 1)
 	if n, err := serverConn.Read(b); n != 0 || err == nil {

internal/testutils/balancer.go

@@ -198,10 +198,7 @@ func (tcc *TestClientConn) WaitForPickerWithErr(ctx context.Context, want error)
 		case <-ctx.Done():
 			return fmt.Errorf("timeout when waiting for an error picker with %v; last picker error: %v", want, lastErr)
 		case picker := <-tcc.NewPickerCh:
-			for i := 0; i < 5; i++ {
-				if _, lastErr = picker.Pick(balancer.PickInfo{}); lastErr == nil || lastErr.Error() != want.Error() {
-					break
-				}
+			if _, lastErr = picker.Pick(balancer.PickInfo{}); lastErr != nil && lastErr.Error() == want.Error() {
 				return nil
 			}
 		}

internal/testutils/roundrobin/roundrobin.go

@@ -127,7 +127,7 @@ func CheckRoundRobinRPCs(ctx context.Context, client testgrpc.TestServiceClient,
 		}
 		return nil
 	}
-	return fmt.Errorf("Timeout when waiting for roundrobin distribution of RPCs across addresses: %v", addrs)
+	return fmt.Errorf("timeout when waiting for roundrobin distribution of RPCs across addresses: %v", addrs)
 }
 
 // CheckWeightedRoundRobinRPCs verifies that EmptyCall RPCs on the given

xds/internal/balancer/clusterimpl/balancer_test.go

@@ -76,13 +76,6 @@ func Test(t *testing.T) {
 	grpctest.RunSubTests(t, s{})
 }
 
-func subConnFromPicker(p balancer.Picker) func() balancer.SubConn {
-	return func() balancer.SubConn {
-		scst, _ := p.Pick(balancer.PickInfo{})
-		return scst.SubConn
-	}
-}
-
 func init() {
 	NewRandomWRR = testutils.NewTestWRR
 }

xds/internal/balancer/priority/balancer_test.go

@@ -70,16 +70,6 @@ func init() {
 	balancer.Register(&anotherRR{Builder: balancer.Get(roundrobin.Name)})
 }
 
-func subConnFromPicker(t *testing.T, p balancer.Picker) func() balancer.SubConn {
-	return func() balancer.SubConn {
-		scst, err := p.Pick(balancer.PickInfo{})
-		if err != nil {
-			t.Fatalf("unexpected error from picker.Pick: %v", err)
-		}
-		return scst.SubConn
-	}
-}
-
 // When a high priority is ready, adding/removing lower locality doesn't cause
 // changes.
 //