1 files changed, 57 insertions, 0 deletions
diff --git a/docshell/test/browser/browser_bug134911.js b/docshell/test/browser/browser_bug134911.js
new file mode 100644
index 0000000000..9b52eeab47
--- /dev/null
+++ b/docshell/test/browser/browser_bug134911.js
@@ -0,0 +1,57 @@
+const TEXT = {
+  /* The test text decoded correctly as Shift_JIS */
+  rightText:
+    "\u30E6\u30CB\u30B3\u30FC\u30C9\u306F\u3001\u3059\u3079\u3066\u306E\u6587\u5B57\u306B\u56FA\u6709\u306E\u756A\u53F7\u3092\u4ED8\u4E0E\u3057\u307E\u3059",
+
+  enteredText1: "The quick brown fox jumps over the lazy dog",
+  enteredText2:
+    "\u03BE\u03B5\u03C3\u03BA\u03B5\u03C0\u03AC\u03B6\u03C9\u0020\u03C4\u1F74\u03BD\u0020\u03C8\u03C5\u03C7\u03BF\u03C6\u03B8\u03CC\u03C1\u03B1\u0020\u03B2\u03B4\u03B5\u03BB\u03C5\u03B3\u03BC\u03AF\u03B1",
+};
+
+function test() {
+  waitForExplicitFinish();
+
+  var rootDir = "http://mochi.test:8888/browser/docshell/test/browser/";
+  gBrowser.selectedTab = BrowserTestUtils.addTab(
+    gBrowser,
+    rootDir + "test-form_sjis.html"
+  );
+  BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser).then(afterOpen);
+}
+
+function afterOpen() {
+  BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser).then(
+    afterChangeCharset
+  );
+
+  SpecialPowers.spawn(gBrowser.selectedBrowser, [TEXT], function (TEXT) {
+    content.document.getElementById("testtextarea").value = TEXT.enteredText1;
+    content.document.getElementById("testinput").value = TEXT.enteredText2;
+  }).then(() => {
+    /* Force the page encoding to Shift_JIS */
+    BrowserForceEncodingDetection();
+  });
+}
+
+function afterChangeCharset() {
+  SpecialPowers.spawn(gBrowser.selectedBrowser, [TEXT], function (TEXT) {
+    is(
+      content.document.getElementById("testpar").innerHTML,
+      TEXT.rightText,
+      "encoding successfully changed"
+    );
+    is(
+      content.document.getElementById("testtextarea").value,
+      TEXT.enteredText1,
+      "text preserved in <textarea>"
+    );
+    is(
+      content.document.getElementById("testinput").value,
+      TEXT.enteredText2,
+      "text preserved in <input>"
+    );
+  }).then(() => {
+    gBrowser.removeCurrentTab();
+    finish();
+  });
+}