chore: add tests for tabs

package.json

@@ -14,7 +14,7 @@
     "type": "git",
     "url": "git+https://github.com/satya164/react-navigation.git"
   },
-  "author": "Satyajit Sahoo <satyajit.happy@gmail.com> (https://github.com/satya164/)",
+  "author": "Satyajit Sahoo <satyajit.happy@gmail.com> (https://github.com/satya164/), Michał Osadnik <micosa97@gmail.com> (https://github.com/osdnk/)",
   "scripts": {
     "lint": "eslint --ext '.js,.ts,.tsx' .",
     "typescript": "tsc --noEmit",

packages/routers/__tests__/TabRouter.test.tsx

@@ -0,0 +1,150 @@
+import { BaseActions } from '@react-navigation/core';
+import { TabRouter } from '../src';
+
+jest.mock('shortid', () => () => 'test');
+
+it('handles navigate action', () => {
+  const router = TabRouter({});
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 1,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: [],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      BaseActions.navigate('baz', { answer: 42 })
+    )
+  ).toEqual({
+    stale: false,
+    key: 'root',
+    index: 0,
+    routeNames: ['baz', 'bar'],
+    routeKeyHistory: ['bar'],
+    routes: [
+      { key: 'baz', name: 'baz', params: { answer: 42 } },
+      { key: 'bar', name: 'bar' },
+    ],
+  });
+});
+
+it('handles jump to action', () => {
+  const router = TabRouter({});
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 0,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: [],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      { type: 'JUMP_TO', payload: { name: 'bar' } }
+    )
+  ).toEqual({
+    stale: false,
+    key: 'root',
+    index: 1,
+    routeNames: ['baz', 'bar'],
+    routeKeyHistory: ['baz'],
+    routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+  });
+});
+
+it('handles history back action', () => {
+  const router = TabRouter({});
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 0,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: ['bar'],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      { type: 'GO_BACK' }
+    )
+  ).toEqual({
+    stale: false,
+    key: 'root',
+    index: 1,
+    routeNames: ['baz', 'bar'],
+    routeKeyHistory: [],
+    routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+  });
+});
+
+it('handles order back action', () => {
+  const router = TabRouter({ backBehavior: 'order' });
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 1,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: [],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      { type: 'GO_BACK' }
+    )
+  ).toEqual({
+    stale: false,
+    key: 'root',
+    index: 0,
+    routeNames: ['baz', 'bar'],
+    routeKeyHistory: [],
+    routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+  });
+});
+
+it('handles order back action', () => {
+  const router = TabRouter({ backBehavior: 'initialRoute' });
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 1,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: [],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      { type: 'GO_BACK' }
+    )
+  ).toEqual({
+    stale: false,
+    key: 'root',
+    index: 0,
+    routeNames: ['baz', 'bar'],
+    routeKeyHistory: [],
+    routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+  });
+});
+
+it('handles none back action', () => {
+  const router = TabRouter({ backBehavior: 'none' });
+
+  expect(
+    router.getStateForAction(
+      {
+        stale: false,
+        key: 'root',
+        index: 0,
+        routeNames: ['baz', 'bar'],
+        routeKeyHistory: [],
+        routes: [{ key: 'baz', name: 'baz' }, { key: 'bar', name: 'bar' }],
+      },
+      { type: 'GO_BACK' }
+    )
+  ).toEqual(null);
+});