[11.x] Add some tests in SupportStrTest class

[saMahmoudzadeh]

This PR, enhances the test coverage for the SupportStrTest class by adding new tests.

1. testStringCanBeLimitedByWords()

Testing negative values for the word count and an empty string are important edge cases to cover.

$this->assertSame('Taylor Otwell', Str::words('Taylor Otwell', -1, '...'));
$this->assertSame('', Str::words('', 3, '...')); 

2. testStringWithoutWordsDoesntProduceError

Testing multiple space and tabs

$this->assertSame('   ', Str::words('   '));
$this->assertSame("\t\t\t", Str::words("\t\t\t"));

3. testStrBeforeLast

$this->assertSame('', Str::beforeLast('', 'test')); // empty string
$this->assertSame('', Str::beforeLast('yvette', 'yvette')); // search parater equal subject parameter
$this->assertSame('laravel', Str::beforeLast("laravel framework", ' ')); // check space
$this->assertSame('yvette', Str::beforeLast("yvette\tyv0et0te", "\t")); // check tab space

[github-actions]

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