test: Add unit tests for exporting jar (#485)

Author: jdneo

test/gradle/.vscode/settings.json

@@ -1,3 +1,4 @@
 {
-    "java.server.launchMode": "Standard"
+    "java.server.launchMode": "Standard",
+    "java.import.gradle.version": "6.8"
 }

test/maven-suite/exportJar.test.ts

@@ -0,0 +1,53 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+import * as assert from "assert";
+import * as cp from "child_process";
+import * as fse from "fs-extra";
+import { suiteTeardown } from "mocha";
+import * as path from "path";
+import { Task, TaskEndEvent, tasks, workspace } from "vscode";
+import { setupTestEnv } from "../shared";
+
+// tslint:disable: only-arrow-functions
+const folderPath: string = workspace.workspaceFolders![0].uri.fsPath;
+const jarFileName: string = "maven.jar";
+const testFolder: string = path.join(folderPath, "test");
+
+suite("Export Jar Tests", () => {
+
+    suiteSetup(setupTestEnv);
+
+    test("Can export jar correctly", async function() {
+        const vscodeTasks: Task[] = await tasks.fetchTasks();
+        const exportJarTask: Task | undefined = vscodeTasks.find((t: Task) => t.name === "java: exportjar:maven");
+        assert.ok(exportJarTask !== undefined);
+
+        await new Promise<void>(async (resolve) => {
+            tasks.onDidEndTask((e: TaskEndEvent) => {
+                if (e.execution.task.name === exportJarTask?.name) {
+                    return resolve();
+                }
+            });
+            await tasks.executeTask(exportJarTask!);
+        });
+
+        const isFileExist: boolean = await fse.pathExists(path.join(folderPath, jarFileName));
+        assert.ok(isFileExist);
+
+        await fse.ensureDir(testFolder);
+        cp.execSync("jar -xvf ../maven.jar", {
+            cwd: testFolder,
+        });
+
+        const isManifestExist: boolean = await fse.pathExists(path.join(testFolder, "META-INF", "MANIFEST.MF"));
+        assert.ok(isManifestExist);
+        const isClassFileExist: boolean = await fse.pathExists(path.join(testFolder, "com", "mycompany", "app", "App.class"));
+        assert.ok(isClassFileExist);
+    });
+
+    suiteTeardown(async function() {
+        await fse.remove(path.join(folderPath, jarFileName));
+        await fse.remove(testFolder);
+    });
+});

test/maven/.vscode/tasks.json

@@ -0,0 +1,16 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "type": "java",
+            "label": "java: exportjar:maven",
+            "mainClass": "com.mycompany.app.App",
+            "targetPath": "${workspaceFolder}/${workspaceFolderBasename}.jar",
+            "elements": [
+                "${compileOutput}",
+                "${dependencies}"
+            ],
+            "problemMatcher": []
+        }
+    ]
+}