1 files changed, 57 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_jsterm_completion_dollar_underscore.js b/devtools/client/webconsole/test/browser/browser_jsterm_completion_dollar_underscore.js
new file mode 100644
index 0000000000..29c8d338e6
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_jsterm_completion_dollar_underscore.js
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that code completion works properly on $_.
+
+"use strict";
+
+const TEST_URI = `data:text/html;charset=utf8,<!DOCTYPE html><p>test code completion on $_`;
+
+add_task(async function () {
+  const hud = await openNewTabAndConsole(TEST_URI);
+  const { jsterm } = hud;
+  const { autocompletePopup } = jsterm;
+
+  info(
+    "Test that there's no issue when trying to do an autocompletion without last " +
+      "evaluation result"
+  );
+  await setInputValueForAutocompletion(hud, "$_.");
+  is(autocompletePopup.items.length, 0, "autocomplete popup has no items");
+  is(autocompletePopup.isOpen, false, "autocomplete popup is not open");
+
+  info("Populate $_ by executing a command");
+  await executeAndWaitForResultMessage(
+    hud,
+    `Object.create(null, Object.getOwnPropertyDescriptors({
+    x: 1,
+    y: "hello"
+  }))`,
+    `Object { x: 1, y: "hello" }`
+  );
+
+  await setInputValueForAutocompletion(hud, "$_.");
+  checkInputCompletionValue(hud, "x", "'$_.' completion (completeNode)");
+  ok(
+    hasExactPopupLabels(autocompletePopup, ["x", "y"]),
+    "autocomplete popup has expected items"
+  );
+  is(autocompletePopup.isOpen, true, "autocomplete popup is open");
+
+  await setInputValueForAutocompletion(hud, "$_.x.");
+  is(autocompletePopup.isOpen, true, "autocomplete popup is open");
+  ok(
+    hasPopupLabel(autocompletePopup, "toExponential"),
+    "autocomplete popup has expected items"
+  );
+
+  await setInputValueForAutocompletion(hud, "$_.y.");
+  is(autocompletePopup.isOpen, true, "autocomplete popup is open");
+  ok(
+    hasPopupLabel(autocompletePopup, "trim"),
+    "autocomplete popup has expected items"
+  );
+
+  info("Close autocomplete popup");
+  await closeAutocompletePopup(hud);
+});