use --failed-furst for make devtest

makefile

@@ -426,7 +426,6 @@ ipy:
 ## Like `make test`, but with debug parameters
 .PHONY: devtest
 devtest:
-	@rm -rf ".pytest_cache";
 	@rm -rf "src/__pycache__";
 	@rm -rf "test/__pycache__";
 
@@ -438,6 +437,7 @@ ifdef FILTER
 		--verbose \
 		--capture=no \
 		--exitfirst \
+		--failed-first \
 		-k $(FILTER) \
 		test/ src/;
 else
@@ -448,10 +448,10 @@ else
 		--verbose \
 		--capture=no \
 		--exitfirst \
+		--failed-first \
 		test/ src/;
 endif
 
-	@rm -rf ".pytest_cache";
 	@rm -rf "src/__pycache__";
 	@rm -rf "test/__pycache__";
 

requirements/development.txt

@@ -34,3 +34,16 @@ snakeviz
 # add one after you've tested it and found it to be actually useful.
 
 ipython     # nuff said
+
+
+# A command line utility to display dependency tree of the installed Python packages
+# https://github.com/naiquevin/pipdeptree
+#
+# For graph output you will need to:
+# $ sudo apt install -y graphviz
+# $ pipdeptree --graph-output svg > requirements/tree.svg
+pipdeptree
+graphviz
+
+# run failed tests first
+pytest-cache