add release version check function

__tests__/release.test.ts

@@ -0,0 +1,117 @@
+import fs = require('fs');
+import path = require('path');
+import nock = require('nock');
+import * as release from '../src/release';
+
+const platform = release.getPlatform();
+
+describe('release tests', () => {
+  it('getPlatform', () => {
+    const platformMap: {[index: string]: string} = {
+      linux: 'linux',
+      macos: 'darwin',
+      windows: 'win32'
+    };
+
+    expect(platform).toEqual(platformMap[process.platform]);
+  });
+
+  describe('determineVersion', () => {
+    beforeEach(() => {
+      const dataDir = path.join(__dirname, 'data');
+
+      nock('https://storage.googleapis.com', {allowUnmocked: true})
+        .get(`/flutter_infra/releases/releases_${platform}.json`)
+        .replyWithFile(200, path.join(dataDir, `releases_${platform}.json`));
+    });
+
+    afterEach(() => {
+      nock.cleanAll();
+      nock.enableNetConnect();
+    });
+
+    it('channel: "stable", version: ""', async () => {
+      const result = await release.determineVersion('', 'stable', platform);
+
+      expect(result.version).toEqual('1.22.0');
+      expect(result.rawVersion).toEqual('1.22.0');
+      expect(result.downloadUrl).toContain('1.22.0');
+    });
+
+    it('channel: "beta", version: ""', async () => {
+      const result = await release.determineVersion('', 'beta', platform);
+
+      expect(result.version).toEqual('1.22.0-12.3.pre');
+      expect(result.rawVersion).toEqual('1.22.0-12.3.pre');
+      expect(result.downloadUrl).toContain('1.22.0-12.3.pre');
+    });
+
+    it('channel: "dev", version: ""', async () => {
+      const result = await release.determineVersion('', 'dev', platform);
+
+      expect(result.version).toEqual('1.23.0-7.0.pre');
+      expect(result.rawVersion).toEqual('1.23.0-7.0.pre');
+      expect(result.downloadUrl).toContain('1.23.0-7.0.pre');
+    });
+
+    it('channel: "dev", version: "1.17.x"', async () => {
+      const result = await release.determineVersion('1.17.x', 'dev', platform);
+
+      expect(result.version).toEqual('1.17.0-dev.5.0');
+      expect(result.rawVersion).toEqual('1.17.0-dev.5.0');
+      expect(result.downloadUrl).toContain('1.17.0-dev.5.0');
+    });
+
+    it('channel: "dev", version: "1.17"', async () => {
+      const result = await release.determineVersion('1.17', 'dev', platform);
+
+      expect(result.version).toEqual('1.17.0-dev.5.0');
+      expect(result.rawVersion).toEqual('1.17.0-dev.5.0');
+      expect(result.downloadUrl).toContain('1.17.0-dev.5.0');
+    });
+
+    it('channel: "dev", version: "1.7.x" (old format)', async () => {
+      const result = await release.determineVersion('1.7.x', 'dev', platform);
+
+      expect(result.version).toEqual('1.7.11');
+      expect(result.rawVersion).toEqual('v1.7.11');
+      expect(result.downloadUrl).toContain('v1.7.11');
+    });
+
+    it('channel: "dev", version: "1.7" (old format)', async () => {
+      const result = await release.determineVersion('1.7', 'dev', platform);
+
+      expect(result.version).toEqual('1.7.11');
+      expect(result.rawVersion).toEqual('v1.7.11');
+      expect(result.downloadUrl).toContain('v1.7.11');
+    });
+
+    it('channel: "dev", version: "0.12.x" (unknown)', async () => {
+      try {
+        await release.determineVersion('0.12.x', 'dev', platform);
+      } catch (e) {
+        expect(e.message).toEqual('unable to find release for 0.12.x');
+      }
+    });
+
+    it('channel: "dev", version: "0.12" (unknown)', async () => {
+      try {
+        await release.determineVersion('0.12', 'dev', platform);
+      } catch (e) {
+        expect(e.message).toEqual('unable to find release for 0.12');
+      }
+    });
+
+    it('channel: "dev", version: "1.17.0-dev.5.0"', async () => {
+      const result = await release.determineVersion(
+        '1.17.0-dev.5.0',
+        'dev',
+        platform
+      );
+
+      expect(result.version).toEqual('1.17.0-dev.5.0');
+      expect(result.rawVersion).toEqual('1.17.0-dev.5.0');
+      expect(result.downloadUrl).toContain('1.17.0-dev.5.0');
+    });
+  });
+});