[fuchsia] Some directory operations

runtime/bin/directory_test.cc

Index: runtime/bin/directory_test.cc
diff --git a/runtime/bin/directory_test.cc b/runtime/bin/directory_test.cc
index d5b81755b9f0aed2f735d7565f43dddeeda95eb7..b99609fbb9135ffb56bb1c2ab1ef050b2645407d 100644
--- a/runtime/bin/directory_test.cc
+++ b/runtime/bin/directory_test.cc
@@ -28,8 +28,7 @@ TEST_CASE(DirectoryExists) {
   const char* current = dart::bin::Directory::Current();
   EXPECT_NOTNULL(current);
 
-  dart::bin::Directory::ExistsResult r =
-      dart::bin::Directory::Exists(current);
+  dart::bin::Directory::ExistsResult r = dart::bin::Directory::Exists(current);
   EXPECT_EQ(dart::bin::Directory::EXISTS, r);
 }
 
@@ -40,6 +39,16 @@ TEST_CASE(DirectorySystemTemp) {
 }
 
 
+TEST_CASE(DirectorySystemTempExists) {
+  const char* system_temp = dart::bin::Directory::SystemTemp();
+  EXPECT_NOTNULL(system_temp);
+
+  dart::bin::Directory::ExistsResult r =
+      dart::bin::Directory::Exists(system_temp);
+  EXPECT_EQ(dart::bin::Directory::EXISTS, r);
+}
+
+
 TEST_CASE(DirectoryCreateTemp) {
   const char* kTempPrefix = "test_prefix";
   const char* system_temp = dart::bin::Directory::SystemTemp();