Verify that inline style sourceMappingURL is resolved properly.

[expanded] 
element.style { ()

[expanded] 
body { (test.less:7 -> test.less:7:3)
    background-color: red;

[expanded] 
.red, body { (mixin.less:2 -> mixin.less:2:3)
    color: red;

[expanded] 
body { (user agent stylesheet)
    display: block;
    margin: 8px;
        margin-top: 8px;
        margin-right: 8px;
        margin-bottom: 8px;
        margin-left: 8px;