Bug 1259702 - test case for webgl getFragDataLocation(). r=jgilbert

dom/canvas/test/webgl-mochitest/test_fuzzing_bugs.html

@@ -82,10 +82,62 @@ function getFramebufferAttachmentParameter_bug1267100()
   ok(true, 'WebGL test getFramebufferAttachmentParameter');
 }
 
+// Test to call getFragDataLocation() when the fragment shader is detatched.
+function getFragDataLocation_bug1259702() {
+  var canvas = document.createElement('canvas');
+
+  var gl = canvas.getContext('webgl2');
+
+  if (!gl) {
+    todo(false, 'WebGL2 is not supported');
+    return;
+  }
+
+  var program = gl.createProgram();
+
+  var vertexShaderSrc =
+    "void main(void) { \
+       gl_Position = vec4(1.0, 1.0, 1.0, 1.0); \
+    }";
+  var fragmentShaderSrc =
+    "void main(void) { \
+       gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0); \
+    }";
+
+  var vertexShader = gl.createShader(gl.VERTEX_SHADER);
+  var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
+
+  gl.shaderSource(vertexShader, vertexShaderSrc);
+  gl.compileShader(vertexShader);
+  gl.attachShader(program, vertexShader);
+
+  gl.shaderSource(fragmentShader, fragmentShaderSrc);
+  gl.compileShader(fragmentShader);
+  gl.attachShader(program, fragmentShader);
+
+  gl.linkProgram(program);
+  if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
+    var lastError = gl.getProgramInfoLog(program);
+    ok(false, 'WebGL getFragDataLocation() test, error in linking:' +
+        lastError);
+    return;
+  }
+
+  gl.useProgram(program);
+
+  gl.detachShader(program, fragmentShader);
+  // Test the getFragDataLocation() call after detatch the shader.
+  // This call should not hit crash.
+  gl.getFragDataLocation(program, "foobar");
+
+  ok(true, 'WebGL getFragDataLocation() call after detatch fragment shader');
+}
+
 function run() {
   webGL2ClearBufferXXX_bug1252414();
   framebufferTexture2D_bug1257593();
   getFramebufferAttachmentParameter_bug1267100();
+  getFragDataLocation_bug1259702();
 
   SimpleTest.finish();
 }