Add a script to check for name clashes in test module file names

Makefile

@@ -107,7 +107,7 @@ clean:
 	rm -rf bin/gradualizer ebin cover test/*.beam
 
 .PHONY: tests eunit compile-tests cli-tests
-tests: build_test_data eunit cli-tests
+tests: check_name_clashes build_test_data eunit cli-tests
 
 test_erls=$(wildcard test/*.erl)
 test_beams=$(test_erls:test/%.erl=test/%.beam)
@@ -216,6 +216,10 @@ dialyze: app $(DIALYZER_PLT)
 dialyze-tests: app $(DIALYZER_PLT)
 	dialyzer $(DIALYZER_OPTS) $(test_data_erls)
 
+.PHONY: check_name_clashes
+check_name_clashes:
+	test/check_name_clashes.sh
+
 # DIALYZER_PLT is a variable understood directly by Dialyzer.
 # Exit status 2 = warnings were emitted
 $(DIALYZER_PLT):

test/check_name_clashes.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+#set -x
+
+if [ x$(uname) == x"Darwin" ]; then
+BASENAME=basename
+else
+BASENAME="basename -a"
+fi
+
+UNIQ=$(find test/should_pass test/should_fail test/known_problems/*/ -name \*.erl \
+        | xargs $BASENAME \
+        | sort \
+        | uniq -c \
+        | sort -n \
+        | tail -1)
+
+COUNT=$(echo $UNIQ | awk '{print $1}')
+
+if [ "$COUNT" == 1 ]; then
+    exit 0
+else
+    echo "Name clash in tests:"
+    find test -name $(echo $UNIQ | awk '{print $2}')
+    exit 1
+fi