Provide relevant error message if datadir is not writable.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 58f033cd89..e750969b65 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -800,4 +800,20 @@ BOOST_AUTO_TEST_CASE(test_LockDirectory)
     fs::remove_all(dirname);
 }
 
+BOOST_AUTO_TEST_CASE(test_DirIsWritable)
+{
+    // Should be able to write to the system tmp dir.
+    fs::path tmpdirname = fs::temp_directory_path();
+    BOOST_CHECK_EQUAL(DirIsWritable(tmpdirname), true);
+
+    // Should not be able to write to a non-existent dir.
+    tmpdirname = fs::temp_directory_path() / fs::unique_path();
+    BOOST_CHECK_EQUAL(DirIsWritable(tmpdirname), false);
+
+    fs::create_directory(tmpdirname);
+    // Should be able to write to it now.
+    BOOST_CHECK_EQUAL(DirIsWritable(tmpdirname), true);
+    fs::remove(tmpdirname);
+}
+
 BOOST_AUTO_TEST_SUITE_END()