test(spec): Control Server API secured via cross-pinning mTLS

. We are now leveraging nix for portable dependency handling.
. There are now three types of tests: client, server and end-to-end.
. server tests exercise the actual kapow server being tested, while the
requests are performed using the test steps.
. client tests exercise the actual kapow client being tested, while the
requests are served using the test steps.
. e2e test exercise the actual kapow program in its dual role of client
and server (¡como tiene que ser!).

Co-authored-by: Roberto Abdelkader Martínez Pérez <robertomartinezp@gmail.com>

spec/test/Makefile

@@ -1,23 +1,20 @@
-.PHONY: lint wip test fix catalog sync
+.PHONY: all lint wip test fix catalog
 
-all: checkbin sync test
+all: checkbin test
 
-sync:
-	pipenv sync
 lint:
 	gherkin-lint
 wip:
-	KAPOW_DEBUG_TESTS=1 pipenv run behave --stop --wip
+	KAPOW_DEBUG_TESTS=1 behave --stop --wip -k
 test: lint
-	pipenv run behave --no-capture --tags=~@skip
+	behave --no-capture --tags=~@skip
 fix: lint
-	KAPOW_DEBUG_TESTS=1 pipenv run behave --stop --no-capture --tags=~@skip
+	KAPOW_DEBUG_TESTS=1 behave --stop --no-capture --tags=~@skip
 catalog:
-	pipenv run behave --format steps.usage --dry-run --no-summary -q
-clean:
-	pipenv --rm
+	behave --format steps.usage --dry-run --no-summary -q
 checkbin:
 	@which kapow >/dev/null || (echo "ERROR: Your kapow binary is not present in PATH" && exit 1)
-testpoc: sync
-	pipenv run pip install -r ../../testutils/poc/requirements.txt
-	PATH=../../testutils/poc:$$PATH KAPOW_CONTROL_URL=http://localhost:8081 KAPOW_DATA_URL=http://localhost:8081 pipenv run behave --no-capture --tags=~@skip
+testpoc:
+	PATH=../../testutils/poc:$$PATH behave --no-capture --tags=~@skip
+wippoc:
+	PATH=../../testutils/poc:$$PATH behave --no-capture --tags=@wip -k