| Tags | tdd regular-expressions |
| Hard Prerequisites |
|
Please test your code using jasmine.
Your directory structure should look like this.
>node_modules <---- make sure this is in your .gitignore
>spec
> support
- jasmine.json
- string_calculator_spec.js
>src
- string_calculator.js
- package.json
Your project is expected to be completed using pytest. You are expected to follow industry best practices in all things. This means that you need to have a directory structure that is in good shape. Please name your files and folders like this:
├── string_calculator the package under test
│ └── calculator.py
├── requirements.txt installation requiremnts
├── setup.py installation script for the package under test
└── tests all package tests go in this directory
└── test_calculator.py
Please take a look at this topic to see an explanation of the required directory structure. : [TODO] Umuzi Tech Department
Before you commence, first read through TOPICS: Data Validation . Upon completion, read through TOPICS: Regular Expression Resources .
Please note that this project should be done in a TDD manner.
Create a function called add() that takes in a string as a parameter and behaves in the following way:
add("")
// should return 0
add("1")
// should return 1
add("1,1")
// should return 2
Note: The output that the function returns should be an integer and not a string.
add("1,2,3,4")
// should return 10
add("")
// should still return 0
add("1")
// should still return 1
add("1,1")
// should still return 2
As you keep adding more functionality to your code always make sure that the previous functionality you implemented still works flawlessly. Keep this in mind as you continue to modify your code.
add("1\n2,3" )
// should return 6
Delimiters will be specified in the following manner:
add("//;\n1;2")
// should return 3
add("//4\n142")
// should return 3
In the first case, the default delimiter is: “;”.
In the second case, the default delimiter is: “4”.
If a negative number is passed into the add function it should throw this exception:
"negatives not allowed"
The exception should contain a list of all the negative integers that were passed into the add function.
For example:
add("-1,-2,3,4")
// should throw the following:
'ERROR: negatives not allowed -1,-2'
add("//;\n1000;1;2")
// should return 3
As long as the string passed in satisfies this format, “//[delimiter]\n[integers…]“, which was explained above. The add function should be able to handle it. For example:
add("//***\n1***2***3")
// should return 6
As long as the string passed into the add function follows this format, “//[delim1][delim2]\n[integers…]“, the add function should be able to handle it:
For example:
add("//[:D][%]\n1:D2%3")
// should return 6
add("//[***][%%%]\n1***2%%%3")
// should return 6
add("//[(-_-')][%]\n1(-_-')2%3")
// should return 6
add("//[abc][777][:(]\n1abc27773:(1")
// should return 7
If the string passed in is invalid, your code should be able to detect this and throw an error.
Hint: A valid string input follows these formats:
- "integer,integer,integer" e.g "1,2" or "1,2,3,4"
- "integer \n integer,integer e.g "1\n2,3"
- "//delimiter \n integer delimiter integer" e.g "//;\n1;2"
- "//[delimiter][delimiter]\n integer delimiter integer" e.g "//[\*][%]\n1\*2%3"
If the string doesn’t abide by any of these formats, it should be considered invalid.
add("//;\n1000;1;2;")
// should throw the following:
'ERROR: invalid input'
add(" //;\n1000,1;2")
// should throw the following:
'ERROR: invalid input'
add("1,2,3//;\n1000,1;2")
// should throw the following:
'ERROR: invalid input'