resolve dkelmer review comments

lib/unittest.bzl

diff --git a/lib/unittest.bzl b/lib/unittest.bzl
index ce835c0..793955f 100644
--- a/lib/unittest.bzl
+++ b/lib/unittest.bzl
@@ -407,7 +407,7 @@
             actual_errors += cause.message + "\n"
         if actual_errors.find(expected_failure_msg) < 0:
             expectation_msg = "Expected errors to contain '%s' but did not. " % expected_failure_msg
-            expectation_msg += "Actual error:%s" % actual_errors
+            expectation_msg += "Actual errors:%s" % actual_errors
             _fail(env, expectation_msg)
     else:
         _fail(env, "Expected failure of target_under_test, but found success")

tests/unittest_tests.bzl

diff --git a/tests/unittest_tests.bzl b/tests/unittest_tests.bzl
index 3dd3bd2..9bdecc6 100644
--- a/tests/unittest_tests.bzl
+++ b/tests/unittest_tests.bzl
@@ -3,7 +3,7 @@
 load("//lib:unittest.bzl", "analysistest", "asserts", "unittest")
 
 ###################################
-####### fail_basic_test ########
+####### fail_basic_test ###########
 ###################################
 def _basic_failing_test(ctx):
     """Unit tests for a basic library verification test that fails."""