Choices: review r3 fix

slider_direction_test.go

@@ -0,0 +1,28 @@
+package mujica
+
+import (
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+// MyGo rounds its 1% move to 1e-9, which can flip the apparent direction; the key decides it.
+func sliderDirectionRun(t *testing.T, key ui.Key, want float64) {
+	t.Helper()
+	r := &sliderRecord{v: 6e-10, low: 6e-10, high: 8e-10}
+	tt := sliderGridTester(r, 0, 1e-8, 1e-10)
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, key)
+	if r.v != want || len(r.single) != 1 {
+		t.Errorf("Slider: %v, reported %v; want %v", r.v, r.single, want)
+	}
+	tt.Key(0, ui.KeyTab)
+	tt.Key(0, key)
+	if r.low != want || len(r.lows) != 1 {
+		t.Errorf("RangeSlider low: %v, reported %v; want %v", r.low, r.lows, want)
+	}
+}
+
+func TestSliderLeftUnderMyGoRounding(t *testing.T) { sliderDirectionRun(t, ui.KeyLeft, 5e-10) }
+
+func TestSliderRightUnderMyGoRounding(t *testing.T) { sliderDirectionRun(t, ui.KeyRight, 7e-10) }