test no-webgl environments using --disabel-webgl CLI flag

Author: etpinard

test/jasmine/bundle_tests/no_webgl_test.js

@@ -0,0 +1,41 @@
+var Plotly = require('@lib');
+
+var createGraphDiv = require('../assets/create_graph_div');
+var destroyGraphDiv = require('../assets/destroy_graph_div');
+var failTest = require('../assets/fail_test');
+
+describe('Plotly w/o WebGL support:', function() {
+    var gd;
+
+    beforeEach(function() {
+        gd = createGraphDiv();
+    });
+
+    afterEach(function() {
+        Plotly.purge(gd);
+        destroyGraphDiv();
+    });
+
+    function checkNoWebGLMsg(visible) {
+        var glDiv = gd.querySelector('div.gl-container');
+        var msg = glDiv.querySelector('div.no-webgl');
+        if(visible) {
+            expect(msg.innerHTML.substr(0, 22)).toBe('WebGL is not supported');
+        } else {
+            expect(msg).toBe(null);
+        }
+    }
+
+    it('gl3d subplots', function(done) {
+        Plotly.react(gd, require('@mocks/gl3d_autocolorscale.json'))
+        .then(function() {
+            checkNoWebGLMsg(true);
+            return Plotly.react(gd, require('@mocks/10.json'));
+        })
+        .then(function() {
+            checkNoWebGLMsg(false);
+        })
+        .catch(failTest)
+        .then(done);
+    });
+});

test/jasmine/karma.conf.js

@@ -188,7 +188,8 @@ func.defaultConfig = {
             flags: [
                 '--touch-events',
                 '--window-size=' + argv.width + ',' + argv.height,
-                isCI ? '--ignore-gpu-blacklist' : ''
+                isCI ? '--ignore-gpu-blacklist' : '',
+                (isBundleTest && basename(testFileGlob) === 'no_webgl') ? '--disable-webgl' : ''
             ]
         },
         _Firefox: {