signature: test new leading/trailing dot parsing

We now allow leading and trailing dots in username and email addresses.
Test that we do so.

tests/libgit2/commit/signature.c

@@ -36,6 +36,13 @@ void test_commit_signature__leading_and_trailing_spaces_are_trimmed(void)
 	assert_name_and_email("nulltoken", "emeric.fermas@gmail.com", " \t nulltoken \n", " \n  emeric.fermas@gmail.com  \n");
 }
 
+void test_commit_signature__leading_and_trailing_dots_are_supported(void)
+{
+	assert_name_and_email(".nulltoken", ".emeric.fermas@gmail.com", ".nulltoken", ".emeric.fermas@gmail.com");
+	assert_name_and_email("nulltoken.", "emeric.fermas@gmail.com.", "nulltoken.", "emeric.fermas@gmail.com.");
+	assert_name_and_email(".nulltoken.", ".emeric.fermas@gmail.com.", ".nulltoken.", ".emeric.fermas@gmail.com.");
+}
+
 void test_commit_signature__leading_and_trailing_crud_is_trimmed(void)
 {
 	assert_name_and_email("nulltoken", "emeric.fermas@gmail.com", "\"nulltoken\"", "\"emeric.fermas@gmail.com\"");