[REF] tests: remove Widget common class

Bad name, and bad practice to use it. It makes tests less standalone.

tests/component/__snapshots__/component.test.ts.snap

@@ -967,7 +967,7 @@ exports[`random stuff/miscellaneous snapshotting compiled code 1`] = `
 exports[`random stuff/miscellaneous t-on with handler bound to dynamic argument on a t-foreach 1`] = `
 "function anonymous(context, extra
 ) {
-    // Template name: \\"__template__1\\"
+    // Template name: \\"__template__2\\"
     let utils = this.constructor.utils;
     let QWeb = this.constructor;
     let parent = context;

tests/helpers.ts

@@ -1,4 +1,4 @@
-import { Env } from "../src/component/component";
+import { Env, Component } from "../src/component/component";
 import { scheduler } from "../src/component/scheduler";
 import { EvalContext, QWeb } from "../src/qweb/qweb";
 import { CompilationContext } from "../src/qweb/compilation_context";
@@ -25,6 +25,7 @@ beforeEach(() => {
   slots = Object.assign({}, QWeb.slots);
   nextId = QWeb.nextId;
   TEMPLATES = Object.assign({}, QWeb.TEMPLATES);
+  Component.scheduler.tasks = [];
 });
 
 afterEach(() => {
@@ -32,6 +33,7 @@ afterEach(() => {
   QWeb.slots = slots;
   QWeb.nextId = nextId;
   QWeb.TEMPLATES = TEMPLATES;
+  Component.scheduler.tasks = [];
 });
 
 // helpers

tests/qweb/qweb.test.ts

@@ -318,12 +318,13 @@ describe("t-set", () => {
         <t t-set="v1" t-value="'after'"/>
         <t t-set="v3" t-value="true"/>
         <t t-raw="v2"/>
-      </div>`);
+      </div>`
+    );
 
-      expect(renderToString(qweb, "test")).toBe("<div><span>before</span></div>");
+    expect(renderToString(qweb, "test")).toBe("<div><span>before</span></div>");
-    });
+  });
 
-    test("t-set with t-value (truthy) and body", () => {
+  test("t-set with t-value (truthy) and body", () => {
     qweb.addTemplate(
       "test",
       `<div>
@@ -335,10 +336,11 @@ describe("t-set", () => {
         <t t-set="v1" t-value="'after'"/>
         <t t-set="v3" t-value="false"/>
         <t t-raw="v2"/>
-      </div>`);
+      </div>`
+    );
 
-      expect(renderToString(qweb, "test")).toBe("<div>Truthy</div>");
+    expect(renderToString(qweb, "test")).toBe("<div>Truthy</div>");
-    });
+  });
 });
 
 describe("t-if", () => {