text_charat mutator is unable to load generator tests.

[AnmAtAnm]

Problem statement

Bug in generator tests:
Blockly.Constants.Text.TEXT_CHARAT_MUTATOR_MIXIN.mutationToDom(..) fails to load tests/generators/text.xml.

Actual Behavior

Steps to Reproduce

1. Load the latest version of the text.xml or colour.xml into the test harness.

Stack Traces

index.html:145 TypeError: Cannot read property 'type' of null
    at Blockly.BlockSvg.mutationToDom (text.js:809)
    at Object.Blockly.Xml.blockToDom (xml.js:103)
    at Object.Blockly.Xml.blockToDom (xml.js:162)
    at Object.Blockly.Xml.blockToDom (xml.js:193)
    at Object.Blockly.Xml.blockToDom (xml.js:162)
    at Object.Blockly.Xml.blockToDomWithXY (xml.js:81)
    at new Blockly.Events.Create (events.js:465)
    at Object.Blockly.Xml.domToBlock (xml.js:482)
    at Object.Blockly.Xml.domToWorkspace (xml.js:345)
    at fromXml (index.html:139)

Operating System and Browser

Tested in...

• Desktop Chrome

[RoboErikG]

And I get a Cross origin error for every test category... When did that break?

index.html:112 Failed to load file:///.../tests/generators/logic.xml: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.

[RoboErikG]

Found another way to test by trying to generate xml for the text_charat block when it doesn't have the second input.

[rachel-fenichel]

Cross origin error: if it's only for the generator tests, that's a known problem: https://developers.google.com/blockly/guides/modify/web/unit-testing#block_generator_tests