Adds go test task for VS Code

.vscode/tasks.json

@@ -1,18 +1,20 @@
 {
-    // See https://go.microsoft.com/fwlink/?LinkId=733558
-    // for the documentation about the tasks.json format
-    "version": "2.0.0",
-    "tasks": [
-        {
-            "label": "Run tests",
-            "type": "shell",
-            "command": "go fmt && go test",
-            "group": "test",
-            "presentation": {
-              "reveal": "always",
-              "panel": "shared",
-
-            }
-        }
-    ]
-}
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "go",
+      "label": "go: test package",
+      "command": "test",
+      "args": [
+        "${fileDirname}"
+      ],
+      "problemMatcher": [
+        "$go"
+      ],
+      "group": "test",
+      "detail": "go test ${fileDirname}"
+    }
+  ]
+}