fix: add tests to package deps

Author: jenstroeger

Makefile

@@ -8,8 +8,9 @@ PACKAGE_NAME := package
 PACKAGE_VERSION := $(shell python -c $$'try: import $(PACKAGE_NAME); print($(PACKAGE_NAME).__version__);\nexcept: print("unknown");')
 
 # Files that this package depends on are in the src/ folder, so collect them
-# all into a list.
-PACKAGE_DEPS := $(shell find src/$(PACKAGE_NAME) -type f -not -path "*/__pycache__/*")
+# all into a list. Also collect everything needed for testing this package.
+PACKAGE_DEPS := $(shell find src/$(PACKAGE_NAME)/ -type f -not -path "*/__pycache__/*")
+PACKAGE_DEPS_TEST := $(shell find tests/ -type f -not -path "*/__pycache__/*")
 
 # This variable contains the first goal that matches any of the listed goals
 # here, else it contains an empty string. The net effect is to filter out
@@ -174,7 +175,7 @@ check: .venv/checked-on
 # the hook setup itself does not pass files to pytest (see .pre-commit-config.yaml).
 .PHONY: test
 test: check .venv/tested-on
-.venv/tested-on: $(PACKAGE_DEPS)
+.venv/tested-on: $(PACKAGE_DEPS) $(PACKAGE_DEPS_TEST)
 	pre-commit run pytest --hook-stage push --files tests/
 	echo "Automatically generated by Python Package Makefile on $$(date '+%Y-%m-%d %H:%M:%S %z')." > .venv/tested-on
 
@@ -230,6 +231,7 @@ prune:
 .PHONY: dist-clean clean
 dist-clean:
 	rm -fr dist/*
+	rm -f .venv/checked-on .venv/tested-on
 	rm -f requirements.txt
 clean: dist-clean
 	rm -fr .coverage .hypothesis/ .mypy_cache/ .pytest_cache/