refactor(netxlite): finish grouping tests (#488)

They are now more readable. I'll do another pass and start
separating integration testing from unit testing.

I think we need to have some always on integration testing
for netxlite that runs on macOS, linux, and windows.

See https://github.com/ooni/probe/issues/1591

internal/netxlite/quirks_test.go

@@ -15,6 +15,7 @@ func TestQuirkReduceErrors(t *testing.T) {
 			t.Fatal("wrong result")
 		}
 	})
+
 	t.Run("single error", func(t *testing.T) {
 		err := errors.New("mocked error")
 		result := quirkReduceErrors([]error{err})
@@ -22,6 +23,7 @@ func TestQuirkReduceErrors(t *testing.T) {
 			t.Fatal("wrong result")
 		}
 	})
+
 	t.Run("multiple errors", func(t *testing.T) {
 		err1 := errors.New("mocked error #1")
 		err2 := errors.New("mocked error #2")
@@ -30,6 +32,7 @@ func TestQuirkReduceErrors(t *testing.T) {
 			t.Fatal("wrong result")
 		}
 	})
+
 	t.Run("multiple errors with meaningful ones", func(t *testing.T) {
 		err1 := errors.New("mocked error #1")
 		err2 := &errorsx.ErrWrapper{