test(ui): deepen effects parity (multiple effects, deps, ordering)

ui/effects_multi_native_test.go

@@ -0,0 +1,64 @@
+//go:build !js || !wasm
+
+package ui_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/monstercameron/GoWebComponents/internal/platform/mockdom"
+	"github.com/monstercameron/GoWebComponents/internal/runtime"
+)
+
+// Deepens the effects port toward React equivalency: several effects in one
+// component run in declaration order on mount; on a re-render a dep-driven effect
+// re-runs (cleanup then setup) only when its deps change, a static-deps effect
+// does not re-run, and a no-deps effect re-runs every render; cleanups run on
+// unmount.
+func TestMultipleEffectsOrderingAndDeps(t *testing.T) {
+	adapter := mockdom.NewMockDOMAdapter()
+	rt := runtime.NewRuntime(runtime.Config{DOMAdapter: adapter, Reset: true})
+	root := adapter.CreateElement("div")
+
+	var parseLog []string
+	var parseSetDep func(any)
+
+	parseComponent := func() *runtime.Element {
+		parseGetDep, parseSetter := runtime.GoUseState(rt, 0)
+		parseSetDep = parseSetter
+		runtime.GoUseEffect(func() func() {
+			parseLog = append(parseLog, "setup-static")
+			return func() { parseLog = append(parseLog, "cleanup-static") }
+		}, 0)
+		runtime.GoUseEffect(func() func() {
+			parseLog = append(parseLog, "setup-dep")
+			return func() { parseLog = append(parseLog, "cleanup-dep") }
+		}, parseGetDep())
+		runtime.GoUseEffect(func() func() {
+			parseLog = append(parseLog, "setup-nodeps")
+			return nil
+		})
+		return runtime.CreateElement("span", map[string]any{}, "x")
+	}
+
+	rt.RenderInto(root, runtime.CreateElement("section", map[string]any{},
+		runtime.CreateElement(parseComponent, map[string]any{})))
+	if parseGot := strings.Join(parseLog, ","); parseGot != "setup-static,setup-dep,setup-nodeps" {
+		t.Fatalf("mount effect order = %q", parseGot)
+	}
+
+	// Dep change: the dep-driven effect re-runs (cleanup then setup); the no-deps
+	// effect re-runs; the static-deps effect does not.
+	parseLog = nil
+	parseSetDep(1)
+	if parseGot := strings.Join(parseLog, ","); parseGot != "cleanup-dep,setup-dep,setup-nodeps" {
+		t.Errorf("dep-change effect order = %q, want cleanup-dep,setup-dep,setup-nodeps", parseGot)
+	}
+
+	// Unmount: cleanups run (the no-deps effect returned nil, so no cleanup-nodeps).
+	parseLog = nil
+	rt.RenderInto(root, runtime.CreateElement("section", map[string]any{}))
+	if parseGot := strings.Join(parseLog, ","); parseGot != "cleanup-static,cleanup-dep" {
+		t.Errorf("unmount cleanup order = %q, want cleanup-static,cleanup-dep", parseGot)
+	}
+}