Adding tests with buttercup & makem.sh

.gitattributes

@@ -0,0 +1 @@
+makem.sh linguist-vendored

.gitignore

@@ -10,3 +10,5 @@
 # Undo-tree save-files
 *.~undo-tree
 
+# Tests
+sandbox/

Makefile

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+# * makem.sh/Makefile --- Script to aid building and testing Emacs Lisp packages
+
+# URL: https://github.com/alphapapa/makem.sh
+# Version: 0.5
+
+# * Arguments
+
+# For consistency, we use only var=val options, not hyphen-prefixed options.
+
+# NOTE: I don't like duplicating the arguments here and in makem.sh,
+# but I haven't been able to find a way to pass arguments which
+# conflict with Make's own arguments through Make to the script.
+# Using -- doesn't seem to do it.
+
+ifdef install-deps
+	INSTALL_DEPS = "--install-deps"
+endif
+ifdef install-linters
+	INSTALL_LINTERS = "--install-linters"
+endif
+
+ifdef sandbox
+	ifeq ($(sandbox), t)
+		SANDBOX = --sandbox
+	else
+		SANDBOX = --sandbox=$(sandbox)
+	endif
+endif
+
+ifdef debug
+	DEBUG = "--debug"
+endif
+
+# ** Verbosity
+
+# Since the "-v" in "make -v" gets intercepted by Make itself, we have
+# to use a variable.
+
+verbose = $(v)
+
+ifneq (,$(findstring vvv,$(verbose)))
+	VERBOSE = "-vvv"
+else ifneq (,$(findstring vv,$(verbose)))
+	VERBOSE = "-vv"
+else ifneq (,$(findstring v,$(verbose)))
+	VERBOSE = "-v"
+endif
+
+# * Rules
+
+# TODO: Handle cases in which "test" or "tests" are called and a
+# directory by that name exists, which can confuse Make.
+
+%:
+	@./makem.sh $(DEBUG) $(VERBOSE) $(SANDBOX) $(INSTALL_DEPS) $(INSTALL_LINTERS) $(@)
+
+.DEFAULT: init
+init:
+	@./makem.sh -vvv $(SANDBOX) --install-linters --install-deps -i buttercup
+
+quick:
+	@./makem.sh -vvv $(SANDBOX) --exclude evaluate-with-file-functions.el --no-compile test
+
+test:
+	@./makem.sh -vvv $(SANDBOX) --exclude evaluate-with-file-functions.el test