1 files changed, 38 insertions, 0 deletions
diff --git a/test/background/operators/impls/SelectPreviousSelectedTabOperator.test.ts b/test/background/operators/impls/SelectPreviousSelectedTabOperator.test.ts
new file mode 100644
index 0000000..5e6cc73
--- /dev/null
+++ b/test/background/operators/impls/SelectPreviousSelectedTabOperator.test.ts
@@ -0,0 +1,38 @@
+import { expect } from "chai";
+import sinon from "sinon";
+import MockTabPresenter from "../../mock/MockTabPresenter";
+import SelectPreviousSelectedTabOperator from "../../../../src/background/operators/impls/SelectPreviousSelectedTabOperator";
+
+describe("SelectPreviousSelectedTabOperator", () => {
+  describe("#run", () => {
+    it("select the last-selected tab", async () => {
+      const tabPresenter = new MockTabPresenter();
+      await tabPresenter.create("https://example.com/1", { active: false });
+      await tabPresenter.create("https://example.com/2", { active: true });
+      await tabPresenter.create("https://example.com/3", { active: false });
+      sinon.stub(tabPresenter, "getLastSelectedId").returns(Promise.resolve(0));
+
+      const sut = new SelectPreviousSelectedTabOperator(tabPresenter);
+      await sut.run();
+
+      const url = (await tabPresenter.getCurrent()).url;
+      expect(url).to.equal("https://example.com/1");
+    });
+
+    it("do nothing if no last-selected tabs", async () => {
+      const tabPresenter = new MockTabPresenter();
+      await tabPresenter.create("https://example.com/1", { active: false });
+      await tabPresenter.create("https://example.com/2", { active: true });
+      await tabPresenter.create("https://example.com/3", { active: false });
+      sinon
+        .stub(tabPresenter, "getLastSelectedId")
+        .returns(Promise.resolve(undefined));
+      const mock = sinon.mock(tabPresenter).expects("select").never();
+
+      const sut = new SelectPreviousSelectedTabOperator(tabPresenter);
+      await sut.run();
+
+      mock.verify();
+    });
+  });
+});