To test an if condition and return statement inside a function using Jest, you can do the following:
- Write a test function that calls the function you want to test and pass in the necessary arguments.
- Use the
expect
function to assert that the return value of the function is what you expect it to be. For example:
test('function should return correct value', () => {
const result = myFunction(arg1, arg2);
expect(result).toBe(expectedValue);
});
- Run the test using the
jest
command.
Here’s an example of a function and a test for it:
function myFunction(arg1, arg2) {
if (arg1 > arg2) {
return 'arg1 is greater';
} else {
return 'arg2 is greater';
}
}
test('function should return correct value', () => {
const result = myFunction(2, 3);
expect(result).toBe('arg2 is greater');
});
In this example, the test function calls myFunction
with the arguments 2
and 3
, and then uses the expect
function to assert that the return value is 'arg2 is greater'
. When you run the test using the jest
command, it will pass if the function returns the expected value.