Fix error handling in deno::ReadFileToString

Starts a unit test for it, and adds to mock_runtime_test.

1 files changed, 13 insertions, 0 deletions

diff --git a/deno2/file_util_test.cc b/deno2/file_util_test.cc
new file mode 100644
index 000000000..3b1c3e239
--- /dev/null
+++ b/deno2/file_util_test.cc
@@ -0,0 +1,13 @@
+// Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
+// All rights reserved. MIT License.
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "file_util.h"
+
+TEST(FileUtilTest, ReadFileToStringFileNotExist) {
+  std::string output;
+  EXPECT_FALSE(deno::ReadFileToString("/should_error_out.txt", &output));
+}
+
+// TODO(ry) success unit test. Needs a tempfile or fixture.
+// TEST(FileUtilTest, ReadFileToStringSuccess) { }