Add tests for error count

Author: Ph0tonic

tests/Rule/BaselinePerIdentifierFormatterTest.php

@@ -23,6 +23,7 @@ public function testFormat(): void
         $formatter->formatErrors(
             $this->createAnalysisResult(
                 [
+                    (new Error('Error simple', $fakeRoot . '/app/file.php', 1))->withIdentifier('sample.identifier'), // @phpstan-ignore phpstanApi.constructor
                     (new Error('Error simple', $fakeRoot . '/app/file.php', 1))->withIdentifier('sample.identifier'), // @phpstan-ignore phpstanApi.constructor
                     (new Error('Error to escape \'#', $fakeRoot . '/app/config.php', 2))->withIdentifier('another.identifier'), // @phpstan-ignore phpstanApi.constructor
                     (new Error('Error 3', $fakeRoot . '/app/index.php', 3)), // @phpstan-ignore phpstanApi.constructor

tests/Rule/data/baselines-neon/sample.identifier.neon

@@ -1,8 +1,8 @@
-# total 1 error
+# total 2 error
 
 parameters:
     ignoreErrors:
         -
             message: '#^Error simple$#'
-            count: 1
+            count: 2
             path: ../app/file.php

tests/Rule/data/baselines-php/sample.identifier.php

@@ -1,11 +1,11 @@
 <?php declare(strict_types = 1);
 
-// total 1 error
+// total 2 error
 
 $ignoreErrors = [];
 $ignoreErrors[] = [
     'message' => '#^Error simple$#',
-    'count' => 1,
+    'count' => 2,
     'path' => __DIR__ . '/../app/file.php',
 ];