Add getTopmostFullScreenRouteTest

Author: WojtekBoman

tests/unit/Navigation/getTopmostFullScreenRouteTest.ts

@@ -0,0 +1,93 @@
+import getTopmostFullScreenRoute from '@libs/Navigation/helpers/getTopmostFullScreenRoute';
+import NAVIGATORS from '@src/NAVIGATORS';
+
+const mockGetRootState = jest.fn();
+
+jest.mock('@libs/Navigation/Navigation', () => ({
+    navigationRef: {
+        getRootState: () => mockGetRootState() as unknown,
+    },
+}));
+
+describe('getTopmostFullScreenRoute', () => {
+    beforeEach(() => {
+        mockGetRootState.mockReset();
+    });
+
+    it('returns undefined when there is no root state', () => {
+        mockGetRootState.mockReturnValue(undefined);
+        expect(getTopmostFullScreenRoute()).toBeUndefined();
+    });
+
+    it('returns undefined when there is no TAB_NAVIGATOR route in the root state', () => {
+        mockGetRootState.mockReturnValue({
+            routes: [{name: NAVIGATORS.RIGHT_MODAL_NAVIGATOR}, {name: NAVIGATORS.SETTINGS_SPLIT_NAVIGATOR}],
+        });
+        expect(getTopmostFullScreenRoute()).toBeUndefined();
+    });
+
+    it('returns undefined when the TAB_NAVIGATOR has no nested state yet', () => {
+        mockGetRootState.mockReturnValue({
+            routes: [{name: NAVIGATORS.TAB_NAVIGATOR}],
+        });
+        expect(getTopmostFullScreenRoute()).toBeUndefined();
+    });
+
+    it('returns the focused tab route based on state.index', () => {
+        const reportsRoute = {name: NAVIGATORS.REPORTS_SPLIT_NAVIGATOR};
+        const searchRoute = {name: NAVIGATORS.SEARCH_FULLSCREEN_NAVIGATOR};
+        mockGetRootState.mockReturnValue({
+            routes: [
+                {
+                    name: NAVIGATORS.TAB_NAVIGATOR,
+                    state: {
+                        index: 1,
+                        routes: [reportsRoute, searchRoute],
+                    },
+                },
+            ],
+        });
+        expect(getTopmostFullScreenRoute()).toBe(searchRoute);
+    });
+
+    it('falls back to the first child route when state.index is missing', () => {
+        const reportsRoute = {name: NAVIGATORS.REPORTS_SPLIT_NAVIGATOR};
+        const searchRoute = {name: NAVIGATORS.SEARCH_FULLSCREEN_NAVIGATOR};
+        mockGetRootState.mockReturnValue({
+            routes: [
+                {
+                    name: NAVIGATORS.TAB_NAVIGATOR,
+                    state: {
+                        routes: [reportsRoute, searchRoute],
+                    },
+                },
+            ],
+        });
+        expect(getTopmostFullScreenRoute()).toBe(reportsRoute);
+    });
+
+    it('returns the focused tab of the topmost TAB_NAVIGATOR when multiple exist', () => {
+        const oldFocused = {name: NAVIGATORS.REPORTS_SPLIT_NAVIGATOR};
+        const newFocused = {name: NAVIGATORS.SEARCH_FULLSCREEN_NAVIGATOR};
+        mockGetRootState.mockReturnValue({
+            routes: [
+                {
+                    name: NAVIGATORS.TAB_NAVIGATOR,
+                    state: {
+                        index: 0,
+                        routes: [oldFocused],
+                    },
+                },
+                {name: NAVIGATORS.RIGHT_MODAL_NAVIGATOR},
+                {
+                    name: NAVIGATORS.TAB_NAVIGATOR,
+                    state: {
+                        index: 0,
+                        routes: [newFocused],
+                    },
+                },
+            ],
+        });
+        expect(getTopmostFullScreenRoute()).toBe(newFocused);
+    });
+});