In this pull request, the unit tests for the SearchParams class have been significantly refactored. The main change is the use of Jest's test.each function, which allows us to run the same test multiple times with different inputs. This makes the tests more concise and easier to maintain, as we can add, remove, or modify test cases simply by modifying an array of parameters.

Additionally, the test labels (the descriptions that appear when the tests are run) have been parameterized. This means that the specific values being tested are included in the test label, making it easier to understand what each test is doing and identify which test has failed if there are any failures.

Here's an example of what the new tests look like:

test.each([
  { page: null, expected: 1 },
  { page: undefined, expected: 1 },
  { page: '', expected: 1 },
  // ... other test cases
])('page prop %p', ({ page, expected }) => {
  const params = new SearchParams();
  expect(params.page).toBe(1);
  // ... rest of the test
});

In this example, %p in the test label is replaced with the value of entry for each test case. This makes it clear what value is being tested in each run of the test.