test/: Add three basic self tests

* true-001.sh: Always returns true - this should never ever fail.

* run-test-001.sh: Invokes run-test, passing itself as a parameter.
  Subsequently, it outputs the very same (hardcoded) expected and actual
  values.

* run-test-002.sh: Tests run-test's negative assertion feature in a way
  similar to run-test-001.sh. However, output different (hardcoded)
  expected and actual values and invoke run-test with the negative test
  prefix ('!').

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

test/Makefile.am

@@ -1,6 +1,12 @@
 AUTOMAKE_OPTIONS = foreign
 
+TESTS = \
+	true-001.sh \
+	run-test-001.sh \
+	run-test-002.sh
+
 check_PROGRAMS = run-test
+check_SCRIPTS = $(TESTS)
 
 run_test_SOURCES = run-test.c