diff -r 000000000000 -r 6474c204b198 browser/devtools/shadereditor/test/browser_se_shaders-edit-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/shadereditor/test/browser_se_shaders-edit-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if compile or linkage errors are emitted when a shader source
+ * gets malformed after being edited.
+ */
+
+function ifWebGLSupported() {
+  let [target, debuggee, panel] = yield initShaderEditor(SIMPLE_CANVAS_URL);
+  let { gFront, EVENTS, ShadersEditorsView } = panel.panelWin;
+
+  reload(target);
+  yield promise.all([
+    once(gFront, "program-linked"),
+    once(panel.panelWin, EVENTS.SOURCES_SHOWN)
+  ]);
+
+  let vsEditor = yield ShadersEditorsView._getEditor("vs");
+  let fsEditor = yield ShadersEditorsView._getEditor("fs");
+
+  vsEditor.replaceText("vec3", { line: 7, ch: 22 }, { line: 7, ch: 26 });
+  let [, error] = yield onceSpread(panel.panelWin, EVENTS.SHADER_COMPILED);
+
+  ok(error,
+    "The new vertex shader source was compiled with errors.");
+  is(error.compile, "",
+    "The compilation status should be empty.");
+  isnot(error.link, "",
+    "The linkage status should not be empty.");
+  is(error.link.split("ERROR").length - 1, 2,
+    "The linkage status contains two errors.");
+  ok(error.link.contains("ERROR: 0:8: 'constructor'"),
+    "A constructor error is contained in the linkage status.");
+  ok(error.link.contains("ERROR: 0:8: 'assign'"),
+    "An assignment error is contained in the linkage status.");
+
+  fsEditor.replaceText("vec4", { line: 2, ch: 14 }, { line: 2, ch: 18 });
+  let [, error] = yield onceSpread(panel.panelWin, EVENTS.SHADER_COMPILED);
+
+  ok(error,
+    "The new fragment shader source was compiled with errors.");
+  is(error.compile, "",
+    "The compilation status should be empty.");
+  isnot(error.link, "",
+    "The linkage status should not be empty.");
+  is(error.link.split("ERROR").length - 1, 1,
+    "The linkage status contains one error.");
+  ok(error.link.contains("ERROR: 0:6: 'constructor'"),
+    "A constructor error is contained in the linkage status.");
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 255, b: 0, a: 255 }, true);
+
+  vsEditor.replaceText("vec4", { line: 7, ch: 22 }, { line: 7, ch: 26 });
+  let [, error] = yield onceSpread(panel.panelWin, EVENTS.SHADER_COMPILED);
+  ok(!error, "The new vertex shader source was compiled successfully.");
+
+  fsEditor.replaceText("vec3", { line: 2, ch: 14 }, { line: 2, ch: 18 });
+  let [, error] = yield onceSpread(panel.panelWin, EVENTS.SHADER_COMPILED);
+  ok(!error, "The new fragment shader source was compiled successfully.");
+
+  yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 255, g: 0, b: 0, a: 255 }, true);
+  yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 255, b: 0, a: 255 }, true);
+
+  yield teardown(panel);
+  finish();
+}