added trigger

Common/Client/go/wshub/zoom_test.go

@@ -0,0 +1,61 @@
+package wshub
+
+import "testing"
+
+func TestZoomPoints(t *testing.T) {
+	cases := []struct {
+		n       int
+		present bool
+		want    int
+	}{
+		{0, false, 2400},    // absent → default budget
+		{2400, true, 2400},  // explicit budget honoured
+		{0, true, 1 << 30},  // 0 → every sample in range
+		{-1, true, 1 << 30}, // negative → every sample in range
+		{5, true, 2400},     // implausibly small → default budget
+	}
+	for _, c := range cases {
+		if got := zoomPoints(c.n, c.present); got != c.want {
+			t.Errorf("zoomPoints(%d,%v) = %d, want %d", c.n, c.present, got, c.want)
+		}
+	}
+}
+
+func TestZoomSliceReturnsFullResolution(t *testing.T) {
+	h := NewHub()
+	rb := newSigRing(1000)
+	ts := make([]float64, 500)
+	vs := make([]float64, 500)
+	for i := range ts {
+		ts[i] = float64(i) * 0.001 // 1 kHz
+		vs[i] = float64(i)
+	}
+	rb.write(ts, vs)
+	h.rings["s1:sig"] = rb
+
+	// A budget larger than the range must return every sample untouched.
+	res := h.zoomSlice(0.100, 0.199, []string{"s1:sig"}, 1<<30)
+	sd, ok := res["s1:sig"]
+	if !ok {
+		t.Fatal("signal missing from zoom result")
+	}
+	if len(sd.T) != 100 {
+		t.Fatalf("got %d points, want 100", len(sd.T))
+	}
+	if sd.V[0] != 100 || sd.V[99] != 199 {
+		t.Errorf("value range = %v..%v, want 100..199", sd.V[0], sd.V[99])
+	}
+
+	// A small budget decimates but keeps the endpoints.
+	dec := h.zoomSlice(0.100, 0.199, []string{"s1:sig"}, 20)
+	if len(dec["s1:sig"].T) != 20 {
+		t.Errorf("decimated to %d points, want 20", len(dec["s1:sig"].T))
+	}
+}
+
+func TestZoomSliceUnknownSignal(t *testing.T) {
+	h := NewHub()
+	if res := h.zoomSlice(0, 1, []string{"nope", ""}, 100); len(res) != 0 {
+		t.Errorf("got %d entries, want 0", len(res))
+	}
+}