add activity test

Author: mdjastrzebski

src/__tests__/render.test.tsx

@@ -112,6 +112,56 @@ describe('render options', () => {
 });
 
 describe('hidden instance props', () => {
+  test('renders Activity hidden and then visible', async () => {
+    await render(
+      <React.Activity mode="hidden">
+        <View testID="activity-target">
+          <Text>Ready</Text>
+        </View>
+      </React.Activity>,
+    );
+
+    expect(screen.queryByTestId('activity-target')).not.toBeOnTheScreen();
+    expect(screen.getByTestId('activity-target', { includeHiddenElements: true }).props.style).toEqual(
+      {
+        display: 'none',
+      },
+    );
+    expect(screen.toJSON()).toMatchInlineSnapshot(`
+      <View
+        style={
+          {
+            "display": "none",
+          }
+        }
+        testID="activity-target"
+      >
+        <Text>
+          Ready
+        </Text>
+      </View>
+    `);
+
+    await screen.rerender(
+      <React.Activity mode="visible">
+        <View testID="activity-target">
+          <Text>Ready</Text>
+        </View>
+      </React.Activity>,
+    );
+
+    expect(screen.getByTestId('activity-target')).toBeOnTheScreen();
+    expect(screen.toJSON()).toMatchInlineSnapshot(`
+      <View
+        testID="activity-target"
+      >
+        <Text>
+          Ready
+        </Text>
+      </View>
+    `);
+  });
+
   test('does not retain hidden UI when the component suspends on initial render', async () => {
     const promise = new Promise<unknown>(() => {});