Add the managetests.json file

This file defines how managetests will build and run the instance.

managetests.json

+{
+    "build": [
+        ["invoke", "build"]
+    ],
+    "before_install": [
+        ["mkdir", "{{base}}/data"],
+        ["virtualenv", "-p", "python3", "{{base}}/env"]
+    ],
+    "install": [
+        {
+            "artifacts": "build/packages/*.whl",
+            "command": ["{{base}}/env/bin/pip", "install", "{{artifact}}"]
+        }
+    ],
+    "run": [
+        "{{base}}/env/bin/uitwww", "run", "-g", "{{gunicorn_config_file}}",
+        "{{base}}/data"
+    ]
+}