Another possibility is you need to get the background-color attribute. You should use this when you what the color shading of a UI element or cell. Use "color" when you want to get at the color of the text itself.
You can always use an rgb string as the expected value in the assert:
"rgb(0, 63, 89)"
To figure out why it's not working as expected I would need to have a first hand look at your application.
Is there any way to check whether a Kendo grid cell is editable or not? I tried Isenabled. But it is always returning true.
Why do you care? Normally you would just let the test script enter the values needed for the business logic and not worry about testing whether the cell is in edit mode or not.
Anyway, how this is accomplished depends on whether row editing mode is used or cell editing mode is used. You will have to write a line or two of code and test whether or not the right attribute is applied to the right UI element as shown in the attached screen shots.