Add Arrange-Act-Assert comments inside tests

[MatanYadaev]

The AAA (Arrange, Act Assert) pattern's purpose is to organize your test in a way that is easier to read and understand. You can read about it here: https://github.com/goldbergyoni/javascript-testing-best-practices#-%EF%B8%8F-12-structure-tests-by-the-aaa-pattern

In this repo, all of the tests are following this pattern. But it's not perfect, because no comments are separating the test into these 3 sections.

This task is about adding these comments.

Example:

// ❌ Before
it('calculates sum', function (): void {
  $firstNumber = 1;
  $secondNumber = 2;

  $result = sum($firstNumber, $secondNumber);

  expect($result)->toBe(3);
});

// ✅ After
it('calculates sum', function (): void {
  // Arrange
  $firstNumber = 1;
  $secondNumber = 2;

  // Act
  $result = sum($firstNumber, $secondNumber);

  // Assert
  expect($result)->toBe(3);
});

Real example:

laravel-eloquent-spatial/tests/SpatialBuilderTest.php

Lines 375 to 390 in ce02266

	it('calculates geometry centroid', function (): void {
	// Arrange
	$polygon = Polygon::fromJson('{"type":"Polygon","coordinates":[[[-1,-1],[1,-1],[1,1],[-1,1],[-1,-1]]]}');
	TestPlace::factory()->create(['polygon' => $polygon]);
	// Act
	/** @var TestPlace $testPlace */
	$testPlace = TestPlace::query()
	->withCentroid('polygon')
	->withCasts(['centroid' => Point::class])
	->firstOrFail();
	// Assert
	$expectedCentroid = new Point(0, 0);
	expect($testPlace->centroid)->toEqual($expectedCentroid);
	});