refactor state handling to make application available independent of the state

tests/unit/application/Context/ApplicationContextFactory.spec.ts

@@ -0,0 +1,83 @@
+import 'mocha';
+import { expect } from 'chai';
+import { OperatingSystem } from '@/domain/OperatingSystem';
+import { ICategoryCollection } from '@/domain/ICategoryCollection';
+import { CategoryCollectionStub } from '../../stubs/CategoryCollectionStub';
+import { EnvironmentStub } from '../../stubs/EnvironmentStub';
+import { ApplicationStub } from '../../stubs/ApplicationStub';
+import { buildContextAsync } from '@/application/Context/ApplicationContextFactory';
+import { IApplicationFactory } from '@/application/IApplicationFactory';
+import { IApplication } from '@/domain/IApplication';
+
+describe('ApplicationContextFactory', () => {
+    describe('buildContextAsync', () => {
+        describe('factory', () => {
+            it('sets application from factory', async () => {
+                // arrange
+                const expected = new ApplicationStub().withCollection(
+                    new CategoryCollectionStub().withOs(OperatingSystem.macOS));
+                const factoryMock = mockFactoryWithApp(expected);
+                // act
+                const context = await buildContextAsync(factoryMock);
+                // assert
+                expect(expected).to.equal(context.app);
+            });
+        });
+        describe('environment', () => {
+            describe('sets initial OS as expected', () => {
+                it('returns currentOs if it is supported', async () => {
+                    // arrange
+                    const expected = OperatingSystem.Windows;
+                    const environment = new EnvironmentStub().withOs(expected);
+                    const collection = new CategoryCollectionStub().withOs(expected);
+                    const factoryMock = mockFactoryWithCollection(collection);
+                    // act
+                    const context = await buildContextAsync(factoryMock, environment);
+                    // assert
+                    const actual = context.state.os;
+                    expect(expected).to.equal(actual);
+                });
+                it('fallbacks to other os if OS in environment is not supported', async () => {
+                    // arrange
+                    const expected = OperatingSystem.Windows;
+                    const currentOs = OperatingSystem.macOS;
+                    const environment = new EnvironmentStub().withOs(currentOs);
+                    const collection = new CategoryCollectionStub().withOs(expected);
+                    const factoryMock = mockFactoryWithCollection(collection);
+                    // act
+                    const context = await buildContextAsync(factoryMock, environment);
+                    // assert
+                    const actual = context.state.os;
+                    expect(expected).to.equal(actual);
+                });
+                it('fallbacks to most supported os if current os is not supported', async () => {
+                    // arrange
+                    const expectedOs = OperatingSystem.Android;
+                    const allCollections = [
+                        new CategoryCollectionStub().withOs(OperatingSystem.Linux).withTotalScripts(3),
+                        new CategoryCollectionStub().withOs(expectedOs).withTotalScripts(5),
+                        new CategoryCollectionStub().withOs(OperatingSystem.Windows).withTotalScripts(4),
+                    ];
+                    const environment = new EnvironmentStub().withOs(OperatingSystem.macOS);
+                    const app = new ApplicationStub().withCollections(...allCollections);
+                    const factoryMock = mockFactoryWithApp(app);
+                    // act
+                    const context = await buildContextAsync(factoryMock, environment);
+                    // assert
+                    const actual = context.state.os;
+                    expect(expectedOs).to.equal(actual, `Expected: ${OperatingSystem[expectedOs]}, actual: ${OperatingSystem[actual]}`);
+                });
+            });
+        });
+    });
+});
+
+function mockFactoryWithCollection(result: ICategoryCollection): IApplicationFactory {
+    return mockFactoryWithApp(new ApplicationStub().withCollection(result));
+}
+
+function mockFactoryWithApp(app: IApplication): IApplicationFactory {
+    return {
+        getAppAsync: () => Promise.resolve(app),
+    };
+}