chore: add Cask + ert-runner test infrastructure

Replace the bare emacs --batch test runner with cask exec ert-runner.
The Makefile test targets now delegate. validate-parens, compile, and
lint stay on bare emacs --batch. Running cask once per file would slow
them down for no real win.

Adds:
- Cask file declaring sources and ert-runner as a dev dep
- .ert-runner config adding . and tests to load-path
- tests/test-helper.el placeholder for future test setup
- .gitignore entry for .cask/

All 88 tests pass in 0.19s via the new path.

5 files changed, 42 insertions, 7 deletions

diff --git a/.ert-runner b/.ert-runner
new file mode 100644
index 0000000..676e285
--- /dev/null
+++ b/.ert-runner
@@ -0,0 +1,2 @@
+-L .
+-L tests
diff --git a/.gitignore b/.gitignore
index 621111a..9c74e1c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,6 +10,9 @@
 *.elc
 *.eln
 
+# Cask-installed deps
+/.cask/
+
 # Test logs
 /tests/*-output.log
 
diff --git a/Cask b/Cask
new file mode 100644
index 0000000..7dea946
--- /dev/null
+++ b/Cask
@@ -0,0 +1,8 @@
+(source gnu)
+(source nongnu)
+(source melpa)
+
+(package-file "gloss.el")
+
+(development
+ (depends-on "ert-runner"))
diff --git a/Makefile b/Makefile
index 047039a..098f259 100644
--- a/Makefile
+++ b/Makefile
@@ -10,11 +10,12 @@ TEST_FILES = $(wildcard tests/test-*.el)
 UNIT_TESTS = $(filter-out tests/test-integration-%.el,$(TEST_FILES))
 INTEGRATION_TESTS = $(wildcard tests/test-integration-*.el)
 
-.PHONY: help test test-unit test-integration test-file test-name validate-parens compile lint clean
+.PHONY: help test test-unit test-integration test-file test-name validate-parens compile lint clean install
 
 help:
 	@echo "Targets:"
-	@echo "  make test                     Run all tests"
+	@echo "  make install                  Install dev deps via Cask"
+	@echo "  make test                     Run all tests via cask exec ert-runner"
 	@echo "  make test-unit                Unit tests only"
 	@echo "  make test-integration         Integration tests only"
 	@echo "  make test-file FILE=path/to/test-foo.el   Run one test file"
@@ -24,22 +25,26 @@ help:
 	@echo "  make lint                     elisp-lint pass"
 	@echo "  make clean                    Remove .elc"
 
+install:
+	@cask install
+
 test:
-	@$(EMACS) $(EMACSFLAGS) $(LOADPATH) -l ert $(addprefix -l ,$(TEST_FILES)) -f ert-run-tests-batch-and-exit
+	@cask exec ert-runner $(TEST_FILES)
 
 test-unit:
-	@$(EMACS) $(EMACSFLAGS) $(LOADPATH) -l ert $(addprefix -l ,$(UNIT_TESTS)) -f ert-run-tests-batch-and-exit
+	@cask exec ert-runner $(UNIT_TESTS)
 
 test-integration:
-	@$(EMACS) $(EMACSFLAGS) $(LOADPATH) -l ert $(addprefix -l ,$(INTEGRATION_TESTS)) -f ert-run-tests-batch-and-exit
+	@if [ -z "$(INTEGRATION_TESTS)" ]; then echo "No integration tests yet."; exit 0; fi
+	@cask exec ert-runner $(INTEGRATION_TESTS)
 
 test-file:
 	@if [ -z "$(FILE)" ]; then echo "Usage: make test-file FILE=tests/test-NAME.el"; exit 1; fi
-	@$(EMACS) $(EMACSFLAGS) $(LOADPATH) -l ert -l "$(FILE)" -f ert-run-tests-batch-and-exit
+	@cask exec ert-runner "$(FILE)"
 
 test-name:
 	@if [ -z "$(TEST)" ]; then echo "Usage: make test-name TEST=pattern"; exit 1; fi
-	@$(EMACS) $(EMACSFLAGS) $(LOADPATH) -l ert $(addprefix -l ,$(TEST_FILES)) --eval "(ert-run-tests-batch-and-exit \"$(TEST)\")"
+	@cask exec ert-runner --pattern "$(TEST)" $(TEST_FILES)
 
 validate-parens:
 	@for f in $(PACKAGE_FILES) $(TEST_FILES); do \
diff --git a/tests/test-helper.el b/tests/test-helper.el
new file mode 100644
index 0000000..783fafa
--- /dev/null
+++ b/tests/test-helper.el
@@ -0,0 +1,17 @@
+;;; test-helper.el --- Test setup for ert-runner -*- lexical-binding: t -*-
+
+;; SPDX-License-Identifier: GPL-3.0-or-later
+
+;;; Commentary:
+
+;; Loaded automatically by ert-runner before test files.  Adds the
+;; tests/ directory to `load-path' so `(require \\='testutil-gloss)' and
+;; sibling testutil files resolve.
+
+;;; Code:
+
+(let ((tests-dir (file-name-directory (or load-file-name buffer-file-name))))
+  (add-to-list 'load-path tests-dir))
+
+(provide 'test-helper)
+;;; test-helper.el ends here