[REF] initial prototype of owl 2

tests/blockdom/remove_hook.test.ts

@@ -0,0 +1,84 @@
+import { createBlock, mount, multi, patch } from "../../src/blockdom";
+import { makeTestFixture } from "./helpers";
+
+//------------------------------------------------------------------------------
+// Setup and helpers
+//------------------------------------------------------------------------------
+
+let fixture: HTMLElement;
+
+beforeEach(() => {
+  fixture = makeTestFixture();
+});
+
+afterEach(() => {
+  fixture.remove();
+});
+
+describe("before remove is called", () => {
+  test("simple removal", async () => {
+    const block1 = createBlock("<div><block-child-0/></div>");
+    const block2 = createBlock("<p>coucou</p>");
+
+    const child = block2();
+    const tree = block1([], [child]);
+    mount(tree, fixture);
+    expect(fixture.innerHTML).toBe("<div><p>coucou</p></div>");
+
+    let n = 1;
+    child.beforeRemove = () => n++;
+    patch(tree, block1([], []), true);
+    expect(fixture.innerHTML).toBe("<div></div>");
+    expect(n).toBe(2);
+  });
+
+  test("removal, variation with grandchild", async () => {
+    const block1 = createBlock("<p><block-child-0/></p>");
+    const block2 = createBlock("<span>coucou</span>");
+
+    const child = block2();
+    const tree = block1([], [block1([], [child])]);
+    mount(tree, fixture);
+    expect(fixture.innerHTML).toBe("<p><p><span>coucou</span></p></p>");
+
+    let n = 1;
+    child.beforeRemove = () => n++;
+    patch(tree, block1([], []), true);
+    expect(fixture.innerHTML).toBe("<p></p>");
+    expect(n).toBe(2);
+  });
+
+  test("remove a child of a multi", async () => {
+    const block1 = createBlock("<div><block-child-0/></div>");
+    const block2 = createBlock("<p>coucou</p>");
+
+    const child1 = block2();
+    const child2 = block2();
+    const tree = block1([], [multi([child1, child2])]);
+    mount(tree, fixture);
+    expect(fixture.innerHTML).toBe("<div><p>coucou</p><p>coucou</p></div>");
+
+    let n = 1;
+    child1.beforeRemove = () => n++;
+    patch(tree, block1([], [multi([])]), true);
+    expect(fixture.innerHTML).toBe("<div></div>");
+    expect(n).toBe(2);
+  });
+
+  test("remove a multi", async () => {
+    const block1 = createBlock("<div><block-child-0/></div>");
+    const block2 = createBlock("<p>coucou</p>");
+
+    const child1 = block2();
+    const child2 = block2();
+    const tree = block1([], [multi([child1, child2])]);
+    mount(tree, fixture);
+    expect(fixture.innerHTML).toBe("<div><p>coucou</p><p>coucou</p></div>");
+
+    let n = 1;
+    child1.beforeRemove = () => n++;
+    patch(tree, block1([], []), true);
+    expect(fixture.innerHTML).toBe("<div></div>");
+    expect(n).toBe(2);
+  });
+});