Add testcase method's name to the test's title

[smuuf]

Resolves #448.

• new feature
• BC break? no (hopefully)

What this does

For tests wrapped in testcase class:

class MyTests extends \Tester\Testcase {
    public function testMethod_1() { ... }
    public function testMethod_2() { ... }
}

... where Tester creates a separate Test object for each of the testcase's methods, we now add (append) the method's name to the (maybe already specified) test's title.

In the case of these two methods, if this PR is merged, the first test object will now have the title "testMethod_1" and the second one will have the title "testMethod_2".

What is looks like

... if Nette Tester self-tests with -o console-lines output mode:

Append... title?

Yes, the test file might also contain "a primary, standalone title definition", like so:

/**
 * These are my tests
 */
class MyTests extends \Tester\Testcase {
    public function testMethod_1() { ... }
    public function testMethod_2() { ... }
}

... in that case the test objects representing both methods would have a same, pre-specified title "These are my tests".

This PR changes this and in the end the first test object would have the title "These are my tests testMethod_1" and the second one will have the title "These are my tests testMethod_2".

[dg]

In what case is the constructor called with a title that has extra spaces?

[smuuf]

Thanks for merging 🌻 Unfortunately your changes introduced a minor bug with dealing with spaces in the test's title:

7d226fa#diff-07c33aaa3cca21e4927002dc11edb6d232627948635ad1e537854703ecd21666R231-R233

	return array_map(
			fn(string $method): Test => $test
				->withTitle("$test->title $method")
				->withArguments(['method' => $method]),
			$methods,
		);

... If the initial instance of Test doesn't have any "primary" title (i.e. $test->title is null or ''), then the new title will contain leading whitespace.

It would probably be sufficient if it was done as ->withTitle(trim("$test->title $method")) instead.