message: fix: resolve cppcheck syntax error
  Don't wrap gtest macros into namespace. cppcheck has problems with that.
diff: @@ -36,6 +36,7 @@ namespace {
  .nonACGTs = std::move(realNonACGTs),
  };
  }
  +}// namespace
  TEST(shouldReportPrimerMutation, REPORT_WHEN_PRIMER_HAS_NO_NONACGTS) {
  const auto mut = makeMutation(12, 'A');
  @@ -90,4 +91,3 @@ namespace {
  });
  EXPECT_FALSE(shouldReportPrimerMutation(mut, primer));
  }
  -}// namespace
  