[io] Add tests for failure to resolve a path using FileSystemEntity.resolveSymbolicLinks.

Bug:https://github.com/dart-lang/sdk/issues/53862
Change-Id: I269668064657856f2c2aa3479618b206aad075aa
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/347204
Commit-Queue: Brian Quinlan <bquinlan@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>

tests/standalone/io/resolve_symbolic_links_test.dart

@@ -96,6 +96,7 @@ main() {
         });
       }));
 
+  asyncTest(testNonExistantPath);
   asyncTest(testLinkTargetTypeChangedAfterCreation);
 }
 
@@ -157,6 +158,13 @@ Future testLink(String name) {
   });
 }
 
+Future testNonExistantPath() async {
+  try {
+    await File('/tmp/foo/doesnotexist').resolveSymbolicLinks();
+    Expect.fail("expected FileSystemException");
+  } on FileSystemException {}
+}
+
 Future testLinkTargetTypeChangedAfterCreation() async {
   // Test the following scenario:
   // 1. create a file