Support templating in root and url

docs/source/index.rst

@@ -140,6 +140,11 @@ it allows you to specify shorter URLs later. If you specify a default
 ``root: https://website.com``, you can later specify ``url: /resource``
 instead of needing to specify the full ``url: https://website.com/resource``.
 
+Both ``root`` and ``url`` support templated values which will be
+formatted using environment variables. For example, if you would like
+to use the ``DEPLOYMENT`` environment variable to fill your ``root``,
+``root: https://{DEPLOYMENT}.website.com/api`` will allow you to do this.
+
 warmup
 ++++++
 
@@ -179,6 +184,11 @@ specified in the ``default`` section, this must be a fully formed URL. If
 you do have a ``root`` specified, this can be a fragment of the URL that will
 be joined with that ``root`` as the above example does.
 
+As with ``root``, ``url`` supports templated values which will be formatted
+using environment variables. For example, if you would like
+to use the ``VERSION`` environment variable to fill your ``url``,
+``url: /api/{VERSION}/status`` will allow you to do this.
+
 method
 ++++++
 

source/_pine.py

@@ -194,9 +194,10 @@ def get_tests(defaults, config, test_names):
             continue
 
         # If there's a configured root url, join it up, otherwise
-        # we'll assume the url is fully formed.
+        # we'll assume the url is fully formed. Format it as well.
         if defaults.root:
-            values["url"] = urljoin(defaults.root, values["url"])
+            value = urljoin(defaults.root, values["url"])
+            values["url"] = value.format(**os.environ)
 
         test = dict(defaults.__dict__)
         test["name"] = test_name