1 files changed, 99 insertions, 0 deletions
diff --git a/devtools/client/shared/sourceeditor/test/browser_detectindent.js b/devtools/client/shared/sourceeditor/test/browser_detectindent.js
new file mode 100644
index 0000000000..80f2487417
--- /dev/null
+++ b/devtools/client/shared/sourceeditor/test/browser_detectindent.js
@@ -0,0 +1,99 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TWO_SPACES_CODE = [
+  "/*",
+  " * tricky comment block",
+  " */",
+  "div {",
+  "  color: red;",
+  "  background: blue;",
+  "}",
+  "     ",
+  "span {",
+  "  padding-left: 10px;",
+  "}",
+].join("\n");
+
+const FOUR_SPACES_CODE = [
+  "var obj = {",
+  "    addNumbers: function() {",
+  "        var x = 5;",
+  "        var y = 18;",
+  "        return x + y;",
+  "    },",
+  "   ",
+  "    /*",
+  "     * Do some stuff to two numbers",
+  "     * ",
+  "     * @param x",
+  "     * @param y",
+  "     * ",
+  "     * @return the result of doing stuff",
+  "     */",
+  "    subtractNumbers: function(x, y) {",
+  "        var x += 7;",
+  "        var y += 18;",
+  "        var result = x - y;",
+  "        result %= 2;",
+  "    }",
+  "}",
+].join("\n");
+
+const TABS_CODE = [
+  "/*",
+  " * tricky comment block",
+  " */",
+  "div {",
+  "\tcolor: red;",
+  "\tbackground: blue;",
+  "}",
+  "",
+  "span {",
+  "\tpadding-left: 10px;",
+  "}",
+].join("\n");
+
+const NONE_CODE = [
+  "var x = 0;",
+  "           // stray thing",
+  "var y = 9;",
+  "    ",
+  "",
+].join("\n");
+
+async function test() {
+  waitForExplicitFinish();
+
+  const { ed, win } = await setup();
+  is(ed.getOption("indentUnit"), 2, "2 spaces before code added");
+  is(ed.getOption("indentWithTabs"), false, "spaces is default");
+
+  ed.setText(NONE_CODE);
+  is(ed.getOption("indentUnit"), 2, "2 spaces after un-detectable code");
+  is(
+    ed.getOption("indentWithTabs"),
+    false,
+    "spaces still set after un-detectable code"
+  );
+
+  ed.setText(FOUR_SPACES_CODE);
+  is(ed.getOption("indentUnit"), 4, "4 spaces detected in 4 space code");
+  is(ed.getOption("indentWithTabs"), false, "spaces detected in 4 space code");
+
+  ed.setText(TWO_SPACES_CODE);
+  is(ed.getOption("indentUnit"), 2, "2 spaces detected in 2 space code");
+  is(ed.getOption("indentWithTabs"), false, "spaces detected in 2 space code");
+
+  ed.setText(TABS_CODE);
+  is(ed.getOption("indentUnit"), 2, "2 space indentation unit");
+  is(
+    ed.getOption("indentWithTabs"),
+    true,
+    "tabs detected in majority tabs code"
+  );
+
+  teardown(ed, win);
+}