Add test that the local key takes precedence over an environment variable.
diff --git a/properties_test.go b/properties_test.go
index 69e1cfc..3a30629 100644
--- a/properties_test.go
+++ b/properties_test.go
@@ -86,6 +86,7 @@
{"key=value\nkey2=${key}", "key", "value", "key2", "value"},
{"key=value\nkey2=${key}\nkey3=${key2}", "key", "value", "key2", "value", "key3", "value"},
{"key=${USER}", "key", os.Getenv("USER")},
+ {"key=${USER}\nUSER=value", "key", "value", "USER", "value"},
}
// define error test cases in the form of
