Add testing to Makefile, remove cover from rebar.config.script

For some mysterious reason the coverage analysis completely crashes
when run from make. Will returned when we know why.

Makefile

@@ -89,6 +89,22 @@ examples: all
 debug:
 	ERLCFLAGS="+debug_info" make all
 
+###############
+### TESTING ###
+###############
+
+# XXX for some reason, the first pass of eunit doesn't run the tests?!
+eunit:
+	@rebar3 as test do compile,eunit,eunit
+
+common-test:
+	@rebar3 as test do compile,ct
+
+ct: common-test
+
+tests:
+	@rebar3 as test do compile,eunit,eunit,ct
+
 # this protects the intermediate .erl files from make's auto deletion
 #.SECONDARY: $(XRL_INTERM) $(YRL_INTERM)
 

rebar.config.script

@@ -27,6 +27,8 @@ OTPRelease =
                     %% If OTP <= R16, take the digits.
                     [N1|Rest];
                 Rel ->
+                    %% If OTP >= 17.x, erlang:system_info(otp_release) returns
+                    %% just the major version number.
                     File = filename:join([code:root_dir(),"releases",Rel,"OTP_VERSION"]),
                     case file:read_file(File) of
                         {error, _} -> Rel;
@@ -83,10 +85,12 @@ Conf1 = case lists:keyfind(erl_opts, 1, Conf0) of
                 Conf0 ++ [{erl_opts,Copts}]
         end,
 
-TestConfig = [{cover_enabled, true}, {cover_opts, [verbose]}],
+%% TestConfig = [{cover_enabled, true}, {cover_opts, [verbose]}],
 
-Aliases = [{alias, [
-    {test, [eunit, {ct, "--cover"}, cover]}
-]}],
+%% Aliases = [{alias, [
+%%     {test, [eunit, {ct, "--cover"}, cover]}
+%% ]}],
 
-Conf1 ++ TestConfig ++ Aliases.
+%% Conf1 ++ TestConfig ++ Aliases.
+
+Conf1.