test: add tests for BaseRouter

packages/core/src/__tests__/BaseRouter.test.tsx

@@ -0,0 +1,133 @@
+import BaseRouter from '../BaseRouter';
+import * as BaseActions from '../BaseActions';
+
+jest.mock('shortid', () => () => 'test');
+
+const STATE = {
+  key: 'root',
+  index: 1,
+  routes: [
+    { key: 'foo', name: 'foo' },
+    { key: 'bar', name: 'bar', params: { fruit: 'orange' } },
+    { key: 'baz', name: 'baz' },
+  ],
+  routeNames: ['foo', 'bar', 'baz', 'qux'],
+};
+
+it('replaces focused screen with REPLACE', () => {
+  const result = BaseRouter.getStateForAction(
+    STATE,
+    BaseActions.replace('qux', { answer: 42 })
+  );
+
+  expect(result).toEqual({
+    key: 'root',
+    index: 1,
+    routes: [
+      { key: 'foo', name: 'foo' },
+      { key: 'qux-test', name: 'qux', params: { answer: 42 } },
+      { key: 'baz', name: 'baz' },
+    ],
+    routeNames: ['foo', 'bar', 'baz', 'qux'],
+  });
+});
+
+it('replaces source screen with REPLACE', () => {
+  const result = BaseRouter.getStateForAction(STATE, {
+    ...BaseActions.replace('qux', { answer: 42 }),
+    source: 'baz',
+  });
+
+  expect(result).toEqual({
+    key: 'root',
+    index: 1,
+    routes: [
+      { key: 'foo', name: 'foo' },
+      { key: 'bar', name: 'bar', params: { fruit: 'orange' } },
+      { key: 'qux-test', name: 'qux', params: { answer: 42 } },
+    ],
+    routeNames: ['foo', 'bar', 'baz', 'qux'],
+  });
+});
+
+it("doesn't handle REPLACE if source key isn't present", () => {
+  const result = BaseRouter.getStateForAction(STATE, {
+    ...BaseActions.replace('qux', { answer: 42 }),
+    source: 'magic',
+  });
+
+  expect(result).toBe(null);
+});
+
+it('sets params for the focused screen with SET_PARAMS', () => {
+  const result = BaseRouter.getStateForAction(
+    STATE,
+    BaseActions.setParams({ answer: 42 })
+  );
+
+  expect(result).toEqual({
+    key: 'root',
+    index: 1,
+    routes: [
+      { key: 'foo', name: 'foo' },
+      { key: 'bar', name: 'bar', params: { answer: 42, fruit: 'orange' } },
+      { key: 'baz', name: 'baz' },
+    ],
+    routeNames: ['foo', 'bar', 'baz', 'qux'],
+  });
+});
+
+it('sets params for the source screen with SET_PARAMS', () => {
+  const result = BaseRouter.getStateForAction(STATE, {
+    ...BaseActions.setParams({ answer: 42 }),
+    source: 'foo',
+  });
+
+  expect(result).toEqual({
+    key: 'root',
+    index: 1,
+    routes: [
+      { key: 'foo', name: 'foo', params: { answer: 42 } },
+      { key: 'bar', name: 'bar', params: { fruit: 'orange' } },
+      { key: 'baz', name: 'baz' },
+    ],
+    routeNames: ['foo', 'bar', 'baz', 'qux'],
+  });
+});
+
+it("doesn't handle SET_PARAMS if source key isn't present", () => {
+  const result = BaseRouter.getStateForAction(STATE, {
+    ...BaseActions.setParams({ answer: 42 }),
+    source: 'magic',
+  });
+
+  expect(result).toBe(null);
+});
+
+it('resets state to new state with RESET', () => {
+  const routes = [
+    { key: 'foo', name: 'foo' },
+    { key: 'bar', name: 'bar', params: { fruit: 'orange' } },
+    { key: 'baz', name: 'baz' },
+    { key: 'qux-1', name: 'qux' },
+  ];
+
+  const result = BaseRouter.getStateForAction(
+    STATE,
+    BaseActions.reset({
+      index: 0,
+      routes,
+    })
+  );
+
+  expect(result).toEqual({ ...STATE, index: 0, routes });
+});
+
+it('ignores key and routeNames when resetting with RESET', () => {
+  const result = BaseRouter.getStateForAction(
+    STATE,
+    BaseActions.reset({ index: 2, key: 'foo', routeNames: ['test'] })
+  );
+
+  expect(result).toEqual({ ...STATE, index: 2 });
+});