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dom_test.go
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dom_test.go
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package vecty
import (
"fmt"
"testing"
)
type testCore struct{ Core }
func (testCore) Render() ComponentOrHTML { return Tag("p") }
type testCorePtr struct{ *Core }
func (testCorePtr) Render() ComponentOrHTML { return Tag("p") }
func TestCore(t *testing.T) {
// Test that a standard *MyComponent with embedded Core works as we expect.
t.Run("comp_ptr_and_core", func(t *testing.T) {
v1 := Tag("v1")
valid := Component(&testCore{})
valid.Context().prevRender = v1
if valid.Context().prevRender != v1 {
t.Fatal("valid.Context().prevRender != v1")
}
})
// Test that a non-pointer MyComponent with embedded Core does not satisfy
// the Component interface:
//
// testCore does not implement Component (Context method has pointer receiver)
//
t.Run("comp_and_core", func(t *testing.T) {
isComponent := func(x interface{}) bool {
_, ok := x.(Component)
return ok
}
if isComponent(testCore{}) {
t.Fatal("expected !isComponent(testCompCore{})")
}
})
// Test what happens when a user accidentally embeds *Core instead of Core in
// their component.
t.Run("comp_ptr_and_core_ptr", func(t *testing.T) {
v1 := Tag("v1")
invalid := Component(&testCorePtr{})
got := recoverStr(func() {
invalid.Context().prevRender = v1
})
// TODO(slimsag): This would happen in user-facing code too. We should
// create a helper for when we access a component's context, which
// would panic with a more helpful message.
want := "runtime error: invalid memory address or nil pointer dereference"
if got != want {
t.Fatalf("got panic %q want %q", got, want)
}
})
t.Run("comp_and_core_ptr", func(t *testing.T) {
v1 := Tag("v1")
invalid := Component(testCorePtr{})
got := recoverStr(func() {
invalid.Context().prevRender = v1
})
// TODO(slimsag): This would happen in user-facing code too. We should
// create a helper for when we access a component's context, which
// would panic with a more helpful message.
want := "runtime error: invalid memory address or nil pointer dereference"
if got != want {
t.Fatalf("got panic %q want %q", got, want)
}
})
}
// TODO(slimsag): TestUnmounter; Unmounter.Unmount
func TestHTML_Node(t *testing.T) {
ts := testSuite(t)
defer ts.done()
x := undefined()
h := &HTML{node: x}
if !h.Node().Equal(x.j) {
t.Fatal("h.Node() != x")
}
}
// TestHTML_reconcile_std tests that (*HTML).reconcile against an old HTML instance
// works as expected (i.e. that it updates nodes correctly).
func TestHTML_reconcile_std(t *testing.T) {
t.Run("text_identical", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
init := Text("foobar")
init.reconcile(nil)
target := Text("foobar")
target.reconcile(init)
})
t.Run("text_diff", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
init := Text("bar")
init.reconcile(nil)
target := Text("foo")
target.reconcile(init)
})
t.Run("properties", func(t *testing.T) {
cases := []struct {
name string
initHTML *HTML
targetHTML *HTML
sortedLines [][2]int
}{
{
name: "diff",
initHTML: Tag("div", Markup(Property("a", 1), Property("b", "2foobar"))),
targetHTML: Tag("div", Markup(Property("a", 3), Property("b", "4foobar"))),
sortedLines: [][2]int{{3, 4}, {12, 13}},
},
{
name: "remove",
initHTML: Tag("div", Markup(Property("a", 1), Property("b", "2foobar"))),
targetHTML: Tag("div", Markup(Property("a", 3))),
sortedLines: [][2]int{{3, 4}},
},
{
name: "replaced_elem_diff",
initHTML: Tag("div", Markup(Property("a", 1), Property("b", "2foobar"))),
targetHTML: Tag("span", Markup(Property("a", 3), Property("b", "4foobar"))),
sortedLines: [][2]int{{3, 4}, {11, 12}},
},
{
name: "replaced_elem_shared",
initHTML: Tag("div", Markup(Property("a", 1), Property("b", "2foobar"))),
targetHTML: Tag("span", Markup(Property("a", 1), Property("b", "4foobar"))),
sortedLines: [][2]int{{3, 4}, {11, 12}},
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.multiSortedDone(tst.sortedLines...)
tst.initHTML.reconcile(nil)
ts.record("(first reconcile done)")
tst.targetHTML.reconcile(tst.initHTML)
})
}
})
t.Run("attributes", func(t *testing.T) {
cases := []struct {
name string
initHTML *HTML
targetHTML *HTML
sortedLines [][2]int
}{
{
name: "diff",
initHTML: Tag("div", Markup(Attribute("a", 1), Attribute("b", "2foobar"))),
targetHTML: Tag("div", Markup(Attribute("a", 3), Attribute("b", "4foobar"))),
sortedLines: [][2]int{{3, 4}, {12, 13}},
},
{
name: "remove",
initHTML: Tag("div", Markup(Attribute("a", 1), Attribute("b", "2foobar"))),
targetHTML: Tag("div", Markup(Attribute("a", 3))),
sortedLines: [][2]int{{3, 4}},
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.multiSortedDone(tst.sortedLines...)
tst.initHTML.reconcile(nil)
ts.record("(first reconcile done)")
tst.targetHTML.reconcile(tst.initHTML)
})
}
})
t.Run("class", func(t *testing.T) {
cases := []struct {
name string
initHTML *HTML
targetHTML *HTML
sortedLines [][2]int
}{
{
name: "multi",
initHTML: Tag("div", Markup(Class("a"), Class("b"))),
targetHTML: Tag("div", Markup(Class("a"), Class("c"))),
sortedLines: [][2]int{{4, 5}},
},
{
name: "diff",
initHTML: Tag("div", Markup(Class("a", "b"))),
targetHTML: Tag("div", Markup(Class("a", "c"))),
sortedLines: [][2]int{{4, 5}},
},
{
name: "remove",
initHTML: Tag("div", Markup(Class("a", "b"))),
targetHTML: Tag("div", Markup(Class("a"))),
sortedLines: [][2]int{{4, 5}},
},
{
name: "map",
initHTML: Tag("div", Markup(ClassMap{"a": true, "b": true})),
targetHTML: Tag("div", Markup(ClassMap{"a": true})),
sortedLines: [][2]int{{4, 5}},
},
{
name: "map_toggle",
initHTML: Tag("div", Markup(ClassMap{"a": true, "b": true})),
targetHTML: Tag("div", Markup(ClassMap{"a": true, "b": false})),
sortedLines: [][2]int{{4, 5}},
},
{
name: "combo",
initHTML: Tag("div", Markup(ClassMap{"a": true, "b": true}, Class("c"))),
targetHTML: Tag("div", Markup(ClassMap{"a": true, "b": false}, Class("d"))),
sortedLines: [][2]int{{4, 6}, {11, 12}},
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.multiSortedDone(tst.sortedLines...)
tst.initHTML.reconcile(nil)
ts.record("(first reconcile done)")
tst.targetHTML.reconcile(tst.initHTML)
})
}
})
t.Run("dataset", func(t *testing.T) {
cases := []struct {
name string
initHTML *HTML
targetHTML *HTML
sortedLines [][2]int
}{
{
name: "diff",
initHTML: Tag("div", Markup(Data("a", "1"), Data("b", "2foobar"))),
targetHTML: Tag("div", Markup(Data("a", "3"), Data("b", "4foobar"))),
sortedLines: [][2]int{{5, 6}, {14, 15}},
},
{
name: "remove",
initHTML: Tag("div", Markup(Data("a", "1"), Data("b", "2foobar"))),
targetHTML: Tag("div", Markup(Data("a", "3"))),
sortedLines: [][2]int{{5, 6}},
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.multiSortedDone(tst.sortedLines...)
tst.initHTML.reconcile(nil)
ts.record("(first reconcile done)")
tst.targetHTML.reconcile(tst.initHTML)
})
}
})
t.Run("style", func(t *testing.T) {
cases := []struct {
name string
initHTML *HTML
targetHTML *HTML
sortedLines [][2]int
}{
{
name: "diff",
initHTML: Tag("div", Markup(Style("a", "1"), Style("b", "2foobar"))),
targetHTML: Tag("div", Markup(Style("a", "3"), Style("b", "4foobar"))),
sortedLines: [][2]int{{6, 7}, {15, 16}},
},
{
name: "remove",
initHTML: Tag("div", Markup(Style("a", "1"), Style("b", "2foobar"))),
targetHTML: Tag("div", Markup(Style("a", "3"))),
sortedLines: [][2]int{{6, 7}},
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.multiSortedDone(tst.sortedLines...)
tst.initHTML.reconcile(nil)
ts.record("(first reconcile done)")
tst.targetHTML.reconcile(tst.initHTML)
})
}
})
t.Run("event_listener", func(t *testing.T) {
// TODO(pdf): Mock listener functions for equality testing
ts := testSuite(t)
defer ts.done()
initEventListeners := []Applyer{
&EventListener{Name: "click"},
&EventListener{Name: "keydown"},
}
prev := Tag("div", Markup(initEventListeners...))
prev.reconcile(nil)
ts.record("(expected two added event listeners above)")
for i, m := range initEventListeners {
listener := m.(*EventListener)
if listener.wrapper == nil {
t.Fatalf("listener %d wrapper == nil: %+v", i, listener)
}
}
targetEventListeners := []Applyer{
&EventListener{Name: "click"},
}
h := Tag("div", Markup(targetEventListeners...))
h.reconcile(prev)
ts.record("(expected two removed, one added event listeners above)")
for i, m := range targetEventListeners {
listener := m.(*EventListener)
if listener.wrapper == nil {
t.Fatalf("listener %d wrapper == nil: %+v", i, listener)
}
}
})
// TODO(pdf): test (*HTML).reconcile child mutations, and value/checked properties
// TODO(pdf): test multi-pass reconcile of persistent component pointer children, ref: https://github.com/hexops/vecty/pull/124
}
// TestHTML_reconcile_nil tests that (*HTML).reconcile(nil) works as expected (i.e.
// that it creates nodes correctly).
func TestHTML_reconcile_nil(t *testing.T) {
t.Run("one_of_tag_or_text", func(t *testing.T) {
got := recoverStr(func() {
h := &HTML{text: "hello", tag: "div"}
h.reconcile(nil)
})
want := "vecty: internal error (only one of HTML.tag or HTML.text may be set)"
if got != want {
t.Fatalf("got panic %q want %q", got, want)
}
})
t.Run("unsafe_text", func(t *testing.T) {
got := recoverStr(func() {
h := &HTML{text: "hello", innerHTML: "foobar"}
h.reconcile(nil)
})
want := "vecty: only HTML may have UnsafeHTML attribute"
if got != want {
t.Fatalf("got panic %q want %q", got, want)
}
})
t.Run("create_element", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
h := Tag("strong")
h.reconcile(nil)
})
t.Run("create_element_ns", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
h := Tag("strong", Markup(Namespace("foobar")))
h.reconcile(nil)
})
t.Run("create_text_node", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
h := Text("hello")
h.reconcile(nil)
})
t.Run("inner_html", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
h := Tag("div", Markup(UnsafeHTML("<p>hello</p>")))
h.reconcile(nil)
})
t.Run("properties", func(t *testing.T) {
ts := testSuite(t)
defer ts.sortedDone(3, 4)
h := Tag("div", Markup(Property("a", 1), Property("b", "2foobar")))
h.reconcile(nil)
})
t.Run("attributes", func(t *testing.T) {
ts := testSuite(t)
defer ts.sortedDone(3, 4)
h := Tag("div", Markup(Attribute("a", 1), Attribute("b", "2foobar")))
h.reconcile(nil)
})
t.Run("dataset", func(t *testing.T) {
ts := testSuite(t)
defer ts.sortedDone(5, 6)
h := Tag("div", Markup(Data("a", "1"), Data("b", "2foobar")))
h.reconcile(nil)
})
t.Run("style", func(t *testing.T) {
ts := testSuite(t)
defer ts.sortedDone(6, 7)
h := Tag("div", Markup(Style("a", "1"), Style("b", "2foobar")))
h.reconcile(nil)
})
t.Run("add_event_listener", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
e0 := &EventListener{Name: "click"}
e1 := &EventListener{Name: "keydown"}
h := Tag("div", Markup(e0, e1))
h.reconcile(nil)
if e0.wrapper == nil {
t.Fatal("e0.wrapper == nil")
}
if e1.wrapper == nil {
t.Fatal("e1.wrapper == nil")
}
})
t.Run("children", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
var compRenderCalls int
compRender := Tag("div")
comp := &componentFunc{
id: "foobar",
render: func() ComponentOrHTML {
compRenderCalls++
return compRender
},
}
h := Tag("div", Tag("div", comp))
h.reconcile(nil)
if compRenderCalls != 1 {
t.Fatal("compRenderCalls != 1")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != comp.id {
t.Fatal("comp.Context().prevRenderComponent.(*componentFunc).id != comp.id")
}
if comp.Context().prevRender != compRender {
t.Fatal("comp.Context().prevRender != compRender")
}
})
t.Run("children_render_nil", func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
var compRenderCalls int
comp := &componentFunc{
id: "foobar",
render: func() ComponentOrHTML {
compRenderCalls++
return nil
},
}
h := Tag("div", Tag("div", comp))
h.reconcile(nil)
if compRenderCalls != 1 {
t.Fatal("compRenderCalls != 1")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != comp.id {
t.Fatal("comp.Context().prevRenderComponent.(*componentFunc).id != comp.id")
}
if comp.Context().prevRender == nil {
t.Fatal("comp.Context().prevRender == nil")
}
})
}
func TestTag(t *testing.T) {
markupCalled := false
want := "foobar"
h := Tag(want, Markup(markupFunc(func(h *HTML) {
markupCalled = true
})))
if !markupCalled {
t.Fatal("expected markup to be applied")
}
if h.tag != want {
t.Fatalf("got tag %q want tag %q", h.text, want)
}
if h.text != "" {
t.Fatal("expected no text")
}
}
func TestText(t *testing.T) {
markupCalled := false
want := "Hello world!"
h := Text(want, Markup(markupFunc(func(h *HTML) {
markupCalled = true
})))
if !markupCalled {
t.Fatal("expected markup to be applied")
}
if h.text != want {
t.Fatalf("got text %q want text %q", h.text, want)
}
if h.tag != "" {
t.Fatal("expected no tag")
}
}
// TestRerender_nil tests that Rerender panics when the component argument is
// nil.
func TestRerender_nil(t *testing.T) {
gotPanic := ""
func() {
defer func() {
r := recover()
if r != nil {
gotPanic = fmt.Sprint(r)
}
}()
Rerender(nil)
}()
expected := "vecty: Rerender illegally called with a nil Component argument"
if gotPanic != expected {
t.Fatalf("got panic %q expected %q", gotPanic, expected)
}
}
// TestRerender_no_prevRender tests the behavior of Rerender when there is no
// previous render.
func TestRerender_no_prevRender(t *testing.T) {
ts := testSuite(t)
defer ts.done()
got := recoverStr(func() {
Rerender(&componentFunc{
render: func() ComponentOrHTML {
panic("expected no Render call")
},
skipRender: func(prev Component) bool {
panic("expected no SkipRender call")
},
})
})
want := "vecty: Rerender invoked on Component that has never been rendered"
if got != want {
t.Fatalf("got panic %q expected %q", got, want)
}
}
// TestRerender_identical tests the behavior of Rerender when there is a
// previous render which is identical to the new render.
func TestRerender_identical(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.strings.mock(`global.Get("document").Get("readyState")`, "complete")
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
// Perform the initial render of the component.
render := Tag("body")
var renderCalled, skipRenderCalled int
comp := &componentFunc{
id: "original",
render: func() ComponentOrHTML {
renderCalled++
return render
},
}
RenderBody(comp)
if renderCalled != 1 {
t.Fatal("renderCalled != 1")
}
if comp.Context().prevRender != render {
t.Fatal("comp.Context().prevRender != render")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
// Perform a re-render.
newRender := Tag("body")
comp.id = "modified"
comp.render = func() ComponentOrHTML {
renderCalled++
return newRender
}
comp.skipRender = func(prev Component) bool {
if comp.id != "modified" {
panic(`comp.id != "modified"`)
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
panic(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
if prev.(*componentFunc).id != "original" {
panic(`prev.(*componentFunc).id != "original"`)
}
skipRenderCalled++
return false
}
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCalled != 2 {
t.Fatal("renderCalled != 2")
}
if skipRenderCalled != 1 {
t.Fatal("skipRenderCalled != 1")
}
if comp.Context().prevRender != newRender {
t.Fatal("comp.Context().prevRender != newRender")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "modified" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "modified"`)
}
}
// TestRerender_change tests the behavior of Rerender when there is a
// previous render which is different from the new render.
func TestRerender_change(t *testing.T) {
cases := []struct {
name string
newRender *HTML
}{
{
name: "new_child",
newRender: Tag("body", Tag("div")),
},
// TODO(slimsag): bug! nil produces <noscript> and we incorrectly try
// to replace <body> with it! We should panic & warn the user.
//{
// name: "nil",
// newRender: nil,
//},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.strings.mock(`global.Get("document").Get("readyState")`, "complete")
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
// Perform the initial render of the component.
render := Tag("body")
var renderCalled, skipRenderCalled int
comp := &componentFunc{
id: "original",
render: func() ComponentOrHTML {
renderCalled++
return render
},
}
RenderBody(comp)
ts.record("(expect body to be set now)")
if renderCalled != 1 {
t.Fatal("renderCalled != 1")
}
if comp.Context().prevRender != render {
t.Fatal("comp.Context().prevRender != render")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
// Perform a re-render.
comp.id = "modified"
comp.render = func() ComponentOrHTML {
renderCalled++
return tst.newRender
}
comp.skipRender = func(prev Component) bool {
if comp.id != "modified" {
panic(`comp.id != "modified"`)
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
panic(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
if prev.(*componentFunc).id != "original" {
panic(`prev.(*componentFunc).id != "original"`)
}
skipRenderCalled++
return false
}
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCalled != 2 {
t.Fatal("renderCalled != 2")
}
if skipRenderCalled != 1 {
t.Fatal("skipRenderCalled != 1")
}
if comp.Context().prevRender != tst.newRender {
t.Fatal("comp.Context().prevRender != tst.newRender")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "modified" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "modified"`)
}
})
}
}
// TestRerender_Nested tests the behavior of Rerender when there is a
// nested Component that is exchanged for *HTML.
func TestRerender_Nested(t *testing.T) {
cases := []struct {
name string
initialRender, newRender ComponentOrHTML
}{
{
name: "html_to_component",
initialRender: Tag("body"),
newRender: &componentFunc{
render: func() ComponentOrHTML {
return Tag("body", Tag("div"))
},
skipRender: func(Component) bool {
return false
},
},
},
{
name: "component_to_html",
initialRender: &componentFunc{
render: func() ComponentOrHTML {
return Tag("body")
},
skipRender: func(Component) bool {
return false
},
},
newRender: Tag("body", Tag("div")),
},
}
for _, tst := range cases {
t.Run(tst.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.strings.mock(`global.Get("document").Get("readyState")`, "complete")
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
// Perform the initial render of the component.
var renderCalled, skipRenderCalled int
comp := &componentFunc{
id: "original",
render: func() ComponentOrHTML {
renderCalled++
return tst.initialRender
},
}
RenderBody(comp)
ts.record("(expect body to be set now)")
if renderCalled != 1 {
t.Fatal("renderCalled != 1")
}
if comp.Context().prevRender != tst.initialRender {
t.Fatal("comp.Context().prevRender != render")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
// Perform a re-render.
comp.id = "modified"
comp.render = func() ComponentOrHTML {
renderCalled++
return tst.newRender
}
comp.skipRender = func(prev Component) bool {
if comp.id != "modified" {
panic(`comp.id != "modified"`)
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "original" {
panic(`comp.Context().prevRenderComponent.(*componentFunc).id != "original"`)
}
if prev.(*componentFunc).id != "original" {
panic(`prev.(*componentFunc).id != "original"`)
}
skipRenderCalled++
return false
}
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if skipRenderCalled != 1 {
t.Fatal("skipRenderCalled != 1")
}
if comp.Context().prevRender != tst.newRender {
t.Fatal("comp.Context().prevRender != tst.newRender")
}
if comp.Context().prevRenderComponent.(*componentFunc).id != "modified" {
t.Fatal(`comp.Context().prevRenderComponent.(*componentFunc).id != "modified"`)
}
})
}
}
type persistentComponentBody struct {
Core
}
func (c *persistentComponentBody) Render() ComponentOrHTML {
return Tag(
"body",
&persistentComponent{},
)
}
var (
lastRenderedComponent Component
renderCount int
)
type persistentComponent struct {
Core
}
func (c *persistentComponent) Render() ComponentOrHTML {
if lastRenderedComponent == nil {
lastRenderedComponent = c
} else if lastRenderedComponent != c {
panic("unexpected last rendered component")
}
renderCount++
return Tag("div")
}
// TestRerender_persistent tests the behavior of rendering persistent
// components.
func TestRerender_persistent(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.strings.mock(`global.Get("document").Get("readyState")`, "complete")
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
lastRenderedComponent = nil
renderCount = 0
comp := &persistentComponentBody{}
// Perform the initial render of the component.
RenderBody(comp)
if renderCount != 1 {
t.Fatal("renderCount != 1")
}
// Perform a re-render.
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCount != 2 {
t.Fatal("renderCount != 2")
}
// Perform a re-render.
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCount != 3 {
t.Fatal("renderCount != 3")
}
}
type persistentComponentBody2 struct {
Core
}
func (c *persistentComponentBody2) Render() ComponentOrHTML {
return Tag(
"body",
&persistentWrapperComponent{},
)
}
type persistentWrapperComponent struct {
Core
}
func (c *persistentWrapperComponent) Render() ComponentOrHTML {
return &persistentComponent{}
}
// TestRerender_persistent_direct tests the behavior of rendering persistent
// components that are directly returned by Render().
func TestRerender_persistent_direct(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.strings.mock(`global.Get("document").Get("readyState")`, "complete")
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
lastRenderedComponent = nil
renderCount = 0
comp := &persistentComponentBody2{}
// Perform the initial render of the component.
RenderBody(comp)
if renderCount != 1 {
t.Fatal("renderCount != 1")
}
// Perform a re-render.
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCount != 2 {
t.Fatal("renderCount != 2")
}
// Perform a re-render.
Rerender(comp)
// Invoke the render callback.
ts.ints.mock(`global.Call("requestAnimationFrame", func)`, 0)
ts.invokeCallbackRequestAnimationFrame(0)
if renderCount != 3 {
t.Fatal("renderCount != 3")
}
}
// TestRenderBody_ExpectsBody tests that RenderBody panics when something other
// than a "body" tag is rendered by the component.
func TestRenderBody_ExpectsBody(t *testing.T) {
cases := []struct {
name string
render *HTML
wantPanic string
}{
{
name: "text",
render: Text("Hello world!"),
wantPanic: "vecty: RenderBody: expected Component.Render to return a \"body\", found \"\"", // TODO(slimsag): error message bug
},
{
name: "div",
render: Tag("div"),
wantPanic: "vecty: RenderBody: expected Component.Render to return a \"body\", found \"div\"",
},
{
name: "nil",
render: nil,
wantPanic: "vecty: RenderBody: expected Component.Render to return a \"body\", found \"noscript\"",
},
}
for _, c := range cases {
t.Run(c.name, func(t *testing.T) {
ts := testSuite(t)
defer ts.done()
ts.strings.mock(`global.Get("document").Call("querySelector", "body").Get("nodeName")`, "BODY")
ts.truthies.mock(`global.Get("document").Call("querySelector", "body")`, true)
var gotPanic string
func() {
defer func() {
r := recover()
if r != nil {
gotPanic = fmt.Sprint(r)
}
}()