test(component): ensure MemoryButton

src/components/CalculatorContainer/MemoryButton.test.ts

@@ -0,0 +1,20 @@
+import { shallowMount } from "@vue/test-utils"
+
+import Component from "./MemoryButton.vue"
+
+describe("Component: CalculatorContainer/MemoryButton", () => {
+	it("can emit custom value", async() => {
+		const wrapper = shallowMount(Component, {
+			"props": {
+				"value": "MC"
+			}
+		})
+		const memoryBtn = wrapper.find("button.memory-button")
+		const memoryBtnValue = wrapper.props("value")
+		expect(memoryBtn.text()).toEqual(String(memoryBtnValue))
+
+		await memoryBtn.trigger("click")
+		const expectedEmission = wrapper.emitted("appendToScreen")
+		expect(expectedEmission).toHaveProperty("0.0", memoryBtnValue)
+	})
+})