Add make target for eunit tests

Makefile

@@ -1,6 +1,15 @@
 PROJECT = riichi
 
-DEPS = reloader
+DEPS = reloader eunit_formatters
 dep_reloader = git https://github.com/oinksoft/reloader.git master
+dep_eunit_formatters = git https://github.com/seancribbs/eunit_formatters.git master
 
 include erlang.mk
+
+ifneq ($(wildcard test/),)
+ebin/$(PROJECT).app:: $(shell find test -type f -name \*_tests.erl)
+	$(if $(strip $?),$(call compile_erl,$?))
+endif
+
+eunit: clean deps app
+	$(gen_verbose) erl -noshell -pa ebin -eval 'eunit:test({application, $(PROJECT)}, [no_tty, {report, {eunit_progress, [colored, profile]}}])' -s init stop

test/eunit_SUITE.erl

@@ -0,0 +1,17 @@
+-module(eunit_SUITE).
+
+-include_lib("common_test/include/ct.hrl").
+
+%% ct.
+-export([all/0]).
+
+%% Tests.
+-export([eunit/1]).
+
+%% ct.
+
+all() ->
+    [eunit].
+
+eunit(_) ->
+    ok = eunit:test({application, riichi}).

test/riichi_tests.erl

@@ -1,6 +1,6 @@
 -module(riichi_tests).
 
--include("riichi.hrl").
+-include("../include/riichi.hrl").
 -include_lib("eunit/include/eunit.hrl").
 
 valid_tile_dragon_test_() ->

test/riichi_yaku_tests.erl

@@ -1,7 +1,5 @@
 -module(riichi_yaku_tests).
 
--compile(export_all).
-
 -include("../include/riichi.hrl").
 -include_lib("eunit/include/eunit.hrl").