Run tests against 'dotnet new' output instead of Yeoman output

test/templates/util/dotnetnew.ts

@@ -0,0 +1,63 @@
+import * as childProcess from 'child_process';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as rimraf from 'rimraf';
+import * as mkdirp from 'mkdirp';
+
+const templatePackageName = 'Microsoft.DotNet.Web.Spa.ProjectTemplates';
+const templatePackageArtifactsDir = '../templates/package-builder/dist/artifacts';
+
+export function generateProjectSync(targetDir: string, templateName: string) {
+    installTemplatePackage(targetDir, templatePackageName, templateName);
+    executeDotNetNewTemplateSync(targetDir, templateName);
+    executeCommand('npm install', /* quiet */ false, targetDir);
+}
+
+function installTemplatePackage(targetDir: string, packageName: string, templateName: string) {
+    // First figure out which file is the latest one for this package
+    const packagePaths = fs.readdirSync(templatePackageArtifactsDir)
+        .filter(name => name.startsWith(templatePackageName + '.'))
+        .filter(name => path.extname(name) === '.nupkg')
+        .map(name => path.join(templatePackageArtifactsDir, name))
+        .sort();
+    const latestPackagePath = packagePaths[packagePaths.length - 1];
+
+    if (!latestPackagePath) {
+        throw new Error(`Could not find ${packageName}.*.nupkg in directory ${templatePackageArtifactsDir}`);
+    }
+
+    // Uninstall any older version so we can be sure the new one did install
+    try {
+        console.log(`Uninstalling any prior version of ${packageName}...`);
+        executeCommand(`dotnet new --uninstall ${packageName}`, /* quiet */ true);
+    } catch (ex) {
+        // Either no prior version existed, or we failed to uninstall. We'll determine
+        // which it was next. 
+    }
+    try {
+        console.log(`Verifying that no prior version of ${packageName} is still installed...`);
+        executeDotNetNewTemplateSync(targetDir, templateName, /* quiet */ true);
+        throw new Error(`Failed to uninstall template package ${packageName}. The template '${templateName}' was not removed as expected.`);
+    } catch (ex) {
+        // Looks like we successfully uninstalled it
+        console.log(`Confirmed that no prior version of ${templatePackageName} remains installed.`);
+    }
+
+    // Now install the new version
+    console.log(`Installing new templates package at ${latestPackagePath}...`);
+    executeCommand(`dotnet new --install ${latestPackagePath}`, /* quiet */ true);
+}
+
+function executeDotNetNewTemplateSync(targetDir: string, templateName: string, quiet?: boolean) {
+    rimraf.sync(targetDir);
+    mkdirp.sync(targetDir);
+    executeCommand(`dotnet new ${templateName}`, quiet, targetDir);
+}
+
+function executeCommand(command: string, quiet?: boolean, cwd?: string) {
+    childProcess.execSync(command, {
+        cwd,
+        stdio: quiet ? null : 'inherit',
+        encoding: 'utf8'
+    });
+}