From cec6b96d8b8ae662028d7f0901cacceeb2eb1c97 Mon Sep 17 00:00:00 2001
From: MF2199 <38331387+mf2199@users.noreply.github.com>
Date: Mon, 31 Aug 2020 16:40:42 -0400
Subject: [PATCH] feat: Stage 5 of `nox` implementation - adding coverage
 targets (#479)

---
 .coveragerc | 23 +++++++++++++++++++++++
 noxfile.py  | 19 +++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 .coveragerc

diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000000..b1a1aa9cf5
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2020 Google LLC
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+[run]
+branch = True
+
+[report]
+fail_under = 100
+show_missing = True
+exclude_lines =
+    # Re-enable the standard pragma
+    pragma: NO COVER
+    # Ignore debug-only repr
+    def __repr__
+    # Ignore abstract methods
+    raise NotImplementedError
+omit =
+  */site-packages/*.py
\ No newline at end of file
diff --git a/noxfile.py b/noxfile.py
index 4570168cd3..016fe33c39 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -69,6 +69,13 @@ def default(session):
     session.run(
         "py.test",
         "--quiet",
+        "--cov=django_spanner",
+        "--cov=spanner_dbapi",
+        "--cov=tests.spanner_dbapi",
+        "--cov-append",
+        "--cov-config=.coveragerc",
+        "--cov-report=",
+        "--cov-fail-under=0",
         os.path.join("tests", "spanner_dbapi"),
         *session.posargs
     )
@@ -80,6 +87,18 @@ def unit(session):
     default(session)
 
 
+@nox.session(python="3.8")
+def cover(session):
+    """Run the final coverage report.
+
+    This outputs the coverage report aggregating coverage from the unit
+    test runs (not system test runs), and then erases coverage data.
+    """
+    session.install("coverage", "pytest-cov")
+    session.run("coverage", "report", "--show-missing", "--fail-under=20")
+    session.run("coverage", "erase")
+
+
 @nox.session(python="3.8")
 def docs(session):
     """Build the docs for this library."""