add Jest suite from vue-cli-3 branch

tests/unit/Layout.spec.js

@@ -0,0 +1,43 @@
+import { shallowMount } from "@vue/test-utils";
+import VueSelect from "../../src/components/Select";
+
+describe("Single value options", () => {
+  it("should reset the search input on focus lost", () => {
+    const Select = shallowMount(VueSelect);
+    Select.vm.open = true;
+
+    Select.vm.search = "t";
+    expect(Select.vm.search).toEqual("t");
+
+    Select.vm.onSearchBlur();
+    expect(Select.vm.search).toEqual("");
+  });
+
+  it('should apply the "hidden" class to the search input when a value is present', () => {
+    const Select = shallowMount(VueSelect, { propsData: { value: "foo" } });
+    expect(Select.vm.inputClasses.hidden).toEqual(true);
+  });
+
+  it('should not apply the "hidden" class to the search input when a value is present, and the dropdown is open', () => {
+    const Select = shallowMount(VueSelect, { propsData: { value: "foo" } });
+    Select.vm.toggleDropdown({ target: Select.vm.$refs.search });
+
+    expect(Select.vm.open).toEqual(true);
+    expect(Select.vm.inputClasses.hidden).toEqual(false);
+  });
+
+  it("should not reset the search input on focus lost when clearSearchOnSelect is false", () => {
+    const Select = shallowMount(VueSelect, {
+      propsData: { value: "foo", clearSearchOnSelect: false }
+    });
+
+    expect(Select.vm.clearSearchOnSelect).toEqual(false);
+
+    Select.vm.open = true;
+    Select.vm.search = "t";
+    expect(Select.vm.search).toEqual("t");
+
+    Select.vm.onSearchBlur();
+    expect(Select.vm.search).toEqual("t");
+  });
+});