toBeEmpty tests

Author: kdquistanchala

packages/native/test/lib/ToBeEmptyElementAssertion.test.tsx

@@ -0,0 +1,37 @@
+import { AssertionError, expect } from "@assertive-ts/core";
+import { render } from "@testing-library/react-native";
+import { View, Text } from "react-native";
+
+import { ToBeEmptyElementAssertion } from "../../src/lib/ToBeEmptyElementAssertion";
+
+describe("[Unit] ToBeEmptyElementAssertion.test.ts", () => {
+  describe(".toBeEmptyElement", () => {
+    context("when the element is empty", () => {
+      it("returns the assertion instance", () => {
+        const element = render(<View testID="id" />);
+        const test = new ToBeEmptyElementAssertion(element.getByTestId("id"));
+
+        expect(test.toBeEmptyElement()).toBe(test);
+        expect(() => test.not.toBeEmptyElement())
+          .toThrowError(AssertionError)
+          .toHaveMessage("Expected element <View ... /> to NOT be empty.");
+      });
+    });
+
+    context("when the element is NOT empty", () => {
+      it("throws an error", () => {
+        const element = render(
+          <View testID="id">
+            <Text>{"Not empty"}</Text>
+          </View>,
+        );
+        const test = new ToBeEmptyElementAssertion(element.getByTestId("id"));
+
+        expect(test.not.toBeEmptyElement()).toBeEqual(test);
+        expect(() => test.toBeEmptyElement())
+          .toThrowError(AssertionError)
+          .toHaveMessage("Expected element <View ... /> to be empty.");
+      });
+    });
+  });
+});