fix: don't allow invalid class names

tests/Features/DatasetProviderErrors.php

@@ -21,7 +21,7 @@ test('reports missing datasets as errors for a single file run', function () use
     $result = $run('tests/Fixtures/Suites/IssueOnly.php');
 
     expect($result['output'])
-        ->toContain("A dataset with the name `missing` does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
+        ->toContain("A dataset with the name [missing] does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
         ->toContain('FAILED')
         ->toContain('Tests:    1 failed')
         ->and($result['code'])->not->toBe(0);
@@ -31,7 +31,7 @@ test('reports missing datasets as errors alongside passing tests', function () u
     $result = $run('tests/Fixtures/Suites/IssueWithPassing.php');
 
     expect($result['output'])
-        ->toContain("A dataset with the name `missing` does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
+        ->toContain("A dataset with the name [missing] does not exist. You can create it using `dataset('missing', ['a', 'b']);`.")
         ->toContain('1 passed')
         ->toContain('1 failed')
         ->and($result['code'])->not->toBe(0);

tests/Features/DatasetsTests.php

@@ -10,12 +10,12 @@ beforeEach(function (): void {
 });
 
 it('throws exception if dataset does not exist', function (): void {
-    expect(fn () => DatasetsRepository::resolve(['first'], __FILE__))->toThrow(DatasetDoesNotExist::class, "A dataset with the name `first` does not exist. You can create it using `dataset('first', ['a', 'b']);`.");
+    expect(fn () => DatasetsRepository::resolve(['first'], __FILE__))->toThrow(DatasetDoesNotExist::class, "A dataset with the name [first] does not exist. You can create it using `dataset('first', ['a', 'b']);`.");
 });
 
 it('throws exception if dataset already exist', function (): void {
     DatasetsRepository::set('second', [[]], __DIR__);
-    expect(fn () => DatasetsRepository::set('second', [[]], __DIR__))->toThrow(DatasetAlreadyExists::class, 'A dataset with the name `second` already exists in scope ['.__DIR__.'].');
+    expect(fn () => DatasetsRepository::set('second', [[]], __DIR__))->toThrow(DatasetAlreadyExists::class, 'A dataset with the name [second] already exists in scope ['.__DIR__.'].');
 });
 
 it('sets closures', function (): void {

tests/Fixtures/Suites/InvalidNames/2fa/login.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The folder name creates the namespace segment `2fa`, which starts with a number.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/ReservedKeyword/list.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `list`, which is a PHP keyword.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/ReservedType/int.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `int`, which is a name PHP reserves.
+
+it('never runs')->assertTrue(true);

tests/Fixtures/Suites/InvalidNames/StartsWithNumber/2fa.test.php

@@ -0,0 +1,5 @@
+<?php
+
+// The file name creates the class `2fa`, which starts with a number.
+
+it('never runs')->assertTrue(true);

tests/Unit/TestSuite.php

@@ -15,7 +15,7 @@ it('does not allow to add the same test description twice', function (): void {
     $testSuite->tests->set($method);
 })->throws(
     TestAlreadyExist::class,
-    sprintf('A test with the description `%s` already exists in the filename `%s`.', 'bar', 'foo'),
+    sprintf('A test with the description [%s] already exists in the filename [%s].', 'bar', 'foo'),
 );
 
 it('does not allow static closures', function (): void {

tests/Visual/Parallel.php

@@ -43,7 +43,7 @@ test('a parallel test can extend another test with same name', function () use (
 
 test('parallel reports invalid datasets as failures', function () use ($run): void {
     expect($run('tests/Fixtures/Suites/ParallelInvalidDataset'))
-        ->toContain("A dataset with the name `missing.dataset` does not exist. You can create it using `dataset('missing.dataset', ['a', 'b']);`.")
+        ->toContain("A dataset with the name [missing.dataset] does not exist. You can create it using `dataset('missing.dataset', ['a', 'b']);`.")
         ->toContain('Tests:    1 failed, 1 passed (1 assertions)')
         ->toContain('Parallel: 3 processes');
 })->skipOnWindows();