add test case for npm test to verify PRs. (#63)

* add test case for `npm test` to verify PRs.
* add the script to install redhat.java extension before executing test

Author: andxu

.gitignore

@@ -6,3 +6,6 @@ out/
 **/lib
 **/server
 **/*.vsix
+.vscode-test/
+vscode-java-*.vsix
+packages/

package-lock.json

@@ -86,7 +86,7 @@
     "vscode:prepublish": "tsc -p ./",
     "compile": "tsc -watch -p ./",
     "postinstall": "node ./node_modules/vscode/bin/install",
-    "test": "node ./node_modules/vscode/bin/test",
+    "test": "node ./scripts/download-vscode-for-system-tests && node ./scripts/install-vsix-dependencies redhat.java && node ./scripts/install-vsix-dependencies vscode-java-dependency-0.3.0.vsix && node ./scripts/run-vscode-tests",
     "build-server": "./node_modules/.bin/gulp build_server"
   },
   "extensionDependencies": [
@@ -97,10 +97,12 @@
     "@types/mocha": "^5.2.5",
     "@types/node": "^6.0.40",
     "@types/xml2js": "^0.4.3",
+    "cross-env": "^5.2.0",
     "gulp": "^4.0.0",
     "gulp-copy": "^4.0.1",
     "gulp-tslint": "^8.1.3",
     "mocha": "^5.2.0",
+    "shelljs": "^0.8.2",
     "tslint": "^5.11.0",
     "typescript": "^3.1.3",
     "vscode": "^1.1.21"

package.json

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+const shell = require('shelljs');
+
+// Downloads an instance of VS Code for tests
+
+if (shell.test('-e', '.vscode-test')) {
+  // Already downloaded the instance of vscode-test
+  shell.echo(
+    'Using already downloaded instance in ' + shell.pwd() + '/.vscode-test'
+  );
+} else {
+  shell.echo(
+    'Invoking ' +
+      shell.pwd() +
+      '/node_modules/vscode/bin/test for downloading VS Code'
+  );
+  shell.exec('node ./node_modules/vscode/bin/test', { silent: true });
+}