Use our classes from tests.lib.* in pytest fixtures

tests/conftest.py

@@ -2,6 +2,8 @@ import py
 import pytest
 
 from tests.lib.path import Path
+from tests.lib.scripttest import PipTestEnvironment
+from tests.lib.venv import VirtualEnvironment
 
 
 @pytest.fixture
@@ -18,3 +20,42 @@ def tmpdir(request):
     name = py.std.re.sub("[\W]", "_", name)
     tmp = request.config._tmpdirhandler.mktemp(name, numbered=True)
     return Path(tmp)
+
+
+@pytest.fixture
+def virtualenv(tmpdir):
+    """
+    Return a virtual environment which is unique to each test function
+    invocation created inside of a sub directory of the test function's
+    temporary directory. The returned object is a
+    ``tests.lib.venv.VirtualEnvironment`` object.
+    """
+    return VirtualEnvironment.create(tmpdir.join(".venv"))
+
+
+@pytest.fixture
+def script(tmpdir, virtualenv):
+    """
+    Return a PipTestEnvironment which is unique to each test function and
+    will execute all commands inside of the unique virtual environment for this
+    test function. The returned object is a
+    ``tests.lib.scripttest.PipTestEnvironment``.
+    """
+    return PipTestEnvironment(
+        # The base location for our test environment
+        tmpdir,
+
+        # Tell the Test Environment where our virtualenv is located
+        virtualenv=virtualenv.location,
+
+        # Do not ignore hidden files, they need to be checked as well
+        ignore_hidden=False,
+
+        # We are starting with an already empty directory
+        start_clear=False,
+
+        # We want to ensure no temporary files are left behind, so the
+        # PipTestEnvironment needs to capture and assert against temp
+        capture_temp=True,
+        assert_no_temp=True,
+    )