From 6834d6a46fcd328ed96e78af8f1d4521119f141b Mon Sep 17 00:00:00 2001
From: Gustav Wulf <gustav@neer.se>
Date: Thu, 25 Jan 2024 11:55:11 +0100
Subject: [PATCH] Added 'make test-cover' to allow easy compare of coverage
 before push to PR.

---
 CONTRIBUTING.md | 6 ++++++
 Makefile        | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3bb0d3bbd..a38170f26 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -60,6 +60,12 @@ Clean everything:
 $ make clean
 ```
 
+Compare coverage to current `develop` branch to see if changes causes reduced coverage.
+Please run before creating a PR.
+```sh
+$ make test-cover
+```
+
 ## Automatic
 
 Keep all of the above tasks running on change:
diff --git a/Makefile b/Makefile
index 0deba4b5a..33d818a7e 100644
--- a/Makefile
+++ b/Makefile
@@ -111,6 +111,13 @@ ifndef DISABLE_COVERAGE
 	poetry run coveragespace update overall
 endif
 
+.PHONY: test-cover
+test-cover: install
+# Run first to generate coverage data current code.
+	TEST_INTEGRATION=true poetry run pytest doorstop --doctest-modules --cov=doorstop --cov-report=xml --cov-report=term-missing
+# Run second to generate coverage data for the code in the develop branch.
+	TEST_INTEGRATION=true diff-cover ./coverage.xml --compare-branch=$(shell git for-each-ref --sort=-committerdate refs/heads/develop | cut -f 1 -d ' ')
+
 .PHONY: read-coverage
 read-coverage:
 	bin/open htmlcov/index.html