For this app, you'll build the UI for your calculator using the same test driven design principles as before.
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Create a test in androidTest
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Build the XML for the UI
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Add use cases for every user interaction you will support before you add UI to support it.
- Build a test
shouldAdd9ToUIthen add a click event to the button to handle that (be sure to use the code you wrote in the Calculator class to do this)
- Build a test
Remember, this calculator should have the following features:
- Add numbers (in the future, you'll add them with buttons 0-9), but for now, just call the methods manually
- Add a decimal to the current number
- Remove the most recently added character (backspace)
- Perform the following calculations
- Addition
- Subraction
- Multiplication
- Division
- Perform repeated calculations (5 * 10 = 50, pressing equals again should return 500, etc.)
- Clear all values
Be sure to add test cases for each use case on each feature before implementing that feature
- Use what we've learned about styles and themes to make the app look how you want it to.