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diff --git a/testing/mochitest/tests/Harness_sanity/test_importInMainProcess.html b/testing/mochitest/tests/Harness_sanity/test_importInMainProcess.html
new file mode 100644
index 0000000000..10e5aa6526
--- /dev/null
+++ b/testing/mochitest/tests/Harness_sanity/test_importInMainProcess.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for SpecialPowers.importInMainProcess</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+
+<div id="content" class="testbody">
+  <script type="text/javascript">
+    SimpleTest.waitForExplicitFinish();
+
+    (async () => {
+      var failed = false;
+      try {
+        await SpecialPowers.importInMainProcess("invalid file for import");
+      } catch (e) {
+        ok(e.toString().indexOf("NS_ERROR_MALFORMED_URI") > -1, "Exception should be for a malformed URI");
+        failed = true;
+      }
+      ok(failed, "An invalid import should throw");
+
+      const testingResource = "resource://testing-common/ImportTesting.jsm";
+      var script = SpecialPowers.loadChromeScript(SimpleTest.getTestFileURL('importtesting_chromescript.js'));
+
+      script.addMessageListener("ImportTesting:IsModuleLoadedReply", handleFirstReply);
+      script.sendAsyncMessage("ImportTesting:IsModuleLoaded", testingResource);
+
+      async function handleFirstReply(aMsg) {
+        ok(!aMsg, "ImportTesting.jsm shouldn't be loaded before we import it");
+
+        try {
+          await SpecialPowers.importInMainProcess(testingResource);
+        } catch (e) {
+          ok(false, "Unexpected exception when importing a valid resource: " + e.toString());
+        }
+
+        script.removeMessageListener("ImportTesting:IsModuleLoadedReply", handleFirstReply);
+        script.addMessageListener("ImportTesting:IsModuleLoadedReply", handleSecondReply);
+        script.sendAsyncMessage("ImportTesting:IsModuleLoaded", testingResource);
+      }
+
+      function handleSecondReply(aMsg) {
+        script.removeMessageListener("ImportTesting:IsModuleLoadedReply", handleSecondReply);
+
+        ok(aMsg, "ImportTesting.jsm should be loaded after we import it");
+
+        SimpleTest.finish();
+      }
+    })();
+
+  </script>
+</div>
+</body>
+</html>