Fix make test to use cellbuild's path

As make test creates a cellbuild, the tests should look for modules in the
cell directory.

This removes the need for activating an environment as part of any custom
test targets.

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Exit `iocsh` if file to run does not exist
 * Add trigger mapping on `LoadedModules` to silence QSRV2 warning
 * Silence warnings on submodule initialisation
+* Automatically use cell path with `test` target (no longer any need to activate an environment as part of the test rule)
 
 ## [5.1.1]
 

configure/E3/CONFIG_TEST

@@ -12,4 +12,6 @@ VARS_EXCLUDES+=TEMP_CELL_PATH
 
 ifneq (,$(findstring test,$(MAKECMDGOALS)))
   E3_MODULES_PATH=$(TEMP_CELL_PATH)/$(notdir $(EPICS_BASE))/require-$(E3_REQUIRE_VERSION)
+  EPICS_DRIVER_PATH:=$(E3_MODULES_PATH):$(EPICS_DRIVER_PATH)
+  PATH:=$(EPICS_BASE)/require/$(E3_REQUIRE_VERSION)/bin:$(PATH)
 endif