test: add tests for get-used-version task

test/get-used-versions.spec.ts

@@ -0,0 +1,43 @@
+import * as chai from 'chai';
+import {expect} from 'chai';
+import * as chaiAsPromised from 'chai-as-promised';
+import {execSync} from 'child_process';
+import {suite, test} from 'mocha-typescript';
+import {join} from 'path';
+import {dirSync} from 'tmp';
+import {getUsedVersion, getUsedVersionMajorMinor} from '../src/tasks/get-used-version';
+
+chai.use(chaiAsPromised);
+chai.should();
+
+@suite()
+export class GetUsedVersionsSpec {
+  @test
+  async 'does not depend on core'() {
+    return getUsedVersion(join(__dirname, '..'), '@openstapps/core').should.eventually.be.rejected;
+  }
+
+  @test
+  async 'not a Node.js project'() {
+    return getUsedVersion(__dirname, '@openstapps/core').should.eventually.be.rejected;
+  }
+
+  @test
+  async 'has no dependencies'() {
+    const temporaryDirectory = dirSync();
+
+    execSync(`cd ${temporaryDirectory.name}; npm init -y`);
+
+    await getUsedVersion(temporaryDirectory.name, '@openstapps/core').should.eventually.be.rejected;
+  }
+
+  @test
+  async 'get used version'() {
+    expect(await getUsedVersion(join(__dirname, '..'), '@krlwlfrt/async-pool')).to.be.equal('0.1.0');
+  }
+
+  @test
+  async 'get used version major minor'() {
+    expect(await getUsedVersionMajorMinor(join(__dirname, '..'), '@krlwlfrt/async-pool')).to.be.equal('0.1');
+  }
+}