docs: update jest README with testing examples and removed react setup instructions that are not currently available.

[professorice]

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[cursor]

Bug: README Bug: Null Handling Inconsistency

The test example in README.md exhibits inconsistent null handling. While the call to current?.track('event') uses optional chaining, suggesting current might be null/undefined, the subsequent expectation expect(current.track).toHaveBeenCalledTimes(1) directly accesses current.track without null checking. If current is null/undefined, the optional chaining prevents the track call, but the expectation will throw a TypeError when attempting to access track on a null/undefined value. This inconsistency can mislead developers using the example.

packages/tooling/jest/README.md#L48-L54

js-core/packages/tooling/jest/README.md

Lines 48 to 54 in b5760c0

	test('mock ldClient correctly', () => {
	const current = useLDClient();
	current?.track('event');
	expect(current.track).toHaveBeenCalledTimes(1);
	});

Fix in Cursor

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