Add documentation

src/rebar.erl

@@ -369,6 +369,8 @@ eunit       [suite[s]=foo]               Run eunit tests in foo.erl and
                                          no such test exists, run the test whose
                                          name starts with bar in the suite's
                                          _tests module
+            [random_suite_order=true]    Run tests in a random order, either with
+            [random_suite_order=Seed]    a random seed for the PRNG, or a specific one.
 
 ct          [suite[s]=] [case=]          Run common_test suites
 

src/rebar_eunit.erl

@@ -126,6 +126,9 @@ info_help(Description) ->
        "               name starts with bar and, if no such test exists,~n"
        "               run the test whose name starts with bar in the~n"
        "               suite's _tests module)~n"
+       "  random_suite_order=true (Run tests in random order)~n"
+       "  random_suite_order=Seed (Run tests in random order,~n"
+       "                           with the PRNG seeded with Seed)~n"
        "  compile_only=true (Compile but do not run tests)",
        [
         Description,