diff --git a/tools/rbcrun/testdata/file_ops.star b/tools/rbcrun/testdata/file_ops.star
index 31631ef..50e39bf 100644
--- a/tools/rbcrun/testdata/file_ops.star
+++ b/tools/rbcrun/testdata/file_ops.star
@@ -9,11 +9,17 @@
     assert.true(not rblf_file_exists("no_such_file"), "the file no_such_file does not exist")
     files = rblf_wildcard("*.star")
     assert.true(myname in files, "expected %s in  %s" % (myname, files))
-    # RBCDATADIR is set by the caller to the path where this file resides
     files = rblf_wildcard("*.star", rblf_env.TEST_DATA_DIR)
     assert.true(myname in files, "expected %s in %s" % (myname, files))
     files = rblf_wildcard("*.xxx")
     assert.true(len(files) == 0, "expansion should be empty but contains %s" % files)
-
-
+    mydir = "testdata"
+    myrelname = "%s/%s" % (mydir, myname)
+    files = rblf_find_files(rblf_env.TEST_DATA_DIR + "/../", "*")
+    assert.true(mydir in files and myrelname in files, "expected %s and %s in %s" % (mydir, myrelname, files))
+    files = rblf_find_files(rblf_env.TEST_DATA_DIR + "/../", "*", only_files=1)
+    assert.true(mydir not in files, "did not expect %s in %s" % (mydir, files))
+    assert.true(myrelname in files, "expected %s  in %s" % (myrelname, files))
+    files = rblf_find_files(rblf_env.TEST_DATA_DIR + "/../", "*.star")
+    assert.true(myrelname in files, "expected %s in %s" % (myrelname, files))
 test()