TUN-4060: Fix Go Vet warnings (new with go 1.16) where t.Fatalf is called from a test goroutine

carrier/carrier_test.go

@@ -81,7 +81,8 @@ func TestStartServer(t *testing.T) {
 	go func() {
 		err := Serve(wsConn, listener, shutdownC, options)
 		if err != nil {
-			t.Fatalf("Error running server: %v", err)
+			t.Errorf("Error running server: %v", err)
+			return
 		}
 	}()
 

h2mux/h2mux_test.go

@@ -663,7 +663,8 @@ func AssertIfPipeReadable(t *testing.T, pipe io.ReadCloser) {
 		b := []byte{0}
 		n, err := pipe.Read(b)
 		if n > 0 {
-			t.Fatalf("read pipe was not empty")
+			t.Errorf("read pipe was not empty")
+			return
 		}
 		errC <- err
 	}()

h2mux/shared_buffer_test.go

@@ -81,7 +81,8 @@ func TestSharedBufferConcurrentReadWrite(t *testing.T) {
 				expectedResult.Write(block[:blockSize])
 				n, err := b.Write(block[:blockSize])
 				if n != blockSize || err != nil {
-					t.Fatalf("write error: %d %s", n, err)
+					t.Errorf("write error: %d %s", n, err)
+					return
 				}
 			}
 		}
@@ -94,7 +95,8 @@ func TestSharedBufferConcurrentReadWrite(t *testing.T) {
 			for i := 0; i < 256; i++ {
 				n, err := io.ReadFull(b, block[:blockSize])
 				if n != blockSize || err != nil {
-					t.Fatalf("read error: %d %s", n, err)
+					t.Errorf("read error: %d %s", n, err)
+					return
 				}
 				actualResult.Write(block[:blockSize])
 			}