WIP components (as built)

stagger_test.go

@@ -0,0 +1,71 @@
+package mujica
+
+import (
+	"testing"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+)
+
+func TestStaggerRevealsInTurnOnce(t *testing.T) {
+	count := 5
+	tt, n := motionFrames(func(c *ui.Context) {
+		ui.Column(c).Children(func() {
+			Stagger(c, count, StaggerOptions{Interval: 50 * time.Millisecond}, func(i int) { ui.Textf(c, "Row %d", i) })
+		})
+	}, 300, 240)
+	if !tt.HasText("Row 0") || tt.HasText("Row 4") {
+		t.Fatalf("first frame: %q", tt.Texts())
+	}
+	time.Sleep(120 * time.Millisecond)
+	tt.Frame()
+	if !tt.HasText("Row 2") || tt.HasText("Row 4") {
+		t.Fatalf("after 120 ms: %q", tt.Texts())
+	}
+	time.Sleep(300 * time.Millisecond)
+	tt.Frame()
+	time.Sleep(250 * time.Millisecond)
+	tt.Frame()
+	if !tt.HasText("Row 4") || motionBusy(tt, n) {
+		t.Fatalf("did not finish and settle: %q", tt.Texts())
+	}
+	count = 6
+	tt.Frame()
+	if !tt.HasText("Row 5") {
+		t.Fatal("item added after the sequence waited")
+	}
+}
+
+func TestStaggerReducedMotionAndInvalid(t *testing.T) {
+	tt := ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		if c.Preferences().ReduceMotion {
+			Stagger(c, 3, StaggerOptions{}, func(i int) { ui.Textf(c, "Row %d", i) })
+		}
+	}, 300, 200)
+	tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: 1})
+	if !tt.HasText("Row 2") {
+		t.Fatalf("reduced motion staggered: %q", tt.Texts())
+	}
+	defer func() {
+		if recover() == nil {
+			t.Fatal("negative n did not panic")
+		}
+	}()
+	ui.Render(func(c *ui.Context) { Use(c, Settings{}); Stagger(c, -1, StaggerOptions{}, nil) }, 100, 50, 1)
+}
+
+func TestStaggerSnapshot(t *testing.T) {
+	snapshot(t, "stagger", 300, 140, func(c *ui.Context) {
+		ui.Column(c).Padding(16).Children(func() {
+			Stagger(c, 3, StaggerOptions{}, func(i int) { ui.Textf(c, "Guest %d arrives", i+1) })
+		})
+	})
+}
+
+func TestStaggerEmptySettles(t *testing.T) {
+	tt, n := motionFrames(func(c *ui.Context) { Stagger(c, 0, StaggerOptions{}, func(int) { t.Fatal("empty item built") }) }, 200, 80)
+	if motionBusy(tt, n) {
+		t.Fatal("empty stagger animated")
+	}
+}