1 files changed, 20 insertions, 0 deletions
diff --git a/toolkit/components/osfile/tests/xpcshell/test_constants.js b/toolkit/components/osfile/tests/xpcshell/test_constants.js
new file mode 100644
index 0000000000..7bc2e72a07
--- /dev/null
+++ b/toolkit/components/osfile/tests/xpcshell/test_constants.js
@@ -0,0 +1,20 @@
+"use strict";
+
+const { OS } = ChromeUtils.import("resource://gre/modules/osfile.jsm");
+
+// Test that OS.Constants is defined correctly.
+add_task(async function check_definition() {
+  Assert.ok(OS.Constants != null);
+  Assert.ok(!!OS.Constants.Win || !!OS.Constants.libc);
+  Assert.ok(OS.Constants.Path != null);
+  Assert.ok(OS.Constants.Sys != null);
+  // check system name
+  Assert.equal(Services.appinfo.OS, OS.Constants.Sys.Name);
+
+  // check if using DEBUG build
+  if (Cc["@mozilla.org/xpcom/debug;1"].getService(Ci.nsIDebug2).isDebugBuild) {
+    Assert.ok(OS.Constants.Sys.DEBUG);
+  } else {
+    Assert.ok(typeof OS.Constants.Sys.DEBUG == "undefined");
+  }
+});