diff --git a/README.md b/README.md
index 4e04cc6e..063d80a6 100644
--- a/README.md
+++ b/README.md
@@ -568,6 +568,7 @@ It's random ideas and plans. No orderings and deadlines. <u>But batch processing
   * [More aggregate rules](https://github.com/markrogoyski/math-php#statistics---descriptive).
   * [More cell rules](https://github.com/Respect/Validation).
   * `required` flag for the column.
+  * Multi values in one cell.
   * Custom cell rule as a callback. It's useful when you have a complex rule that can't be described in the schema file.
   * Custom agregate rule as a callback. It's useful when you have a complex rule that can't be described in the schema file.
   * Configurable keyword for null/empty values. By default, it's an empty string. But you will use `null`, `nil`, `none`, `empty`, etc. Overridable on the column level.
@@ -594,6 +595,7 @@ It's random ideas and plans. No orderings and deadlines. <u>But batch processing
 * **Mock data generation**
   * Create CSV files based on the schema (like "create 1000 rows with random data based on schema and rules").
   * Use [Faker](https://github.com/FakerPHP/Faker) for random data generation.
+  * [ReverseRegex](https://github.com/enso-media/ReverseRegex) to generate text from regex.
 
 * **Reporting**
   * More report formats (like JSON, XML, etc). Any ideas?
diff --git a/tests/Commands/ValidateCsvTest.php b/tests/Commands/ValidateCsvTest.php
index b3f081e7..879102d3 100644
--- a/tests/Commands/ValidateCsvTest.php
+++ b/tests/Commands/ValidateCsvTest.php
@@ -485,4 +485,13 @@ public function testInvalidSchemaAndNoFoundCSV(): void
         isSame(1, $exitCode, $actual);
         isSame($expected, $actual);
     }
+
+    public function testSchemaNotFound(): void
+    {
+        $this->expectExceptionMessage('Schema file not found: invalid_schema_path.yml');
+        Tools::virtualExecution('validate:csv', [
+            'csv'    => './tests/fixtures/no-found-file.csv',
+            'schema' => 'invalid_schema_path.yml',
+        ]);
+    }
 }
diff --git a/tests/Rules/Cell/AllowValuesTest.php b/tests/Rules/Cell/AllowValuesTest.php
index e97d5456..ab7e508c 100644
--- a/tests/Rules/Cell/AllowValuesTest.php
+++ b/tests/Rules/Cell/AllowValuesTest.php
@@ -42,11 +42,16 @@ public function testPositive(): void
     public function testNegative(): void
     {
         $rule = $this->create(['1', '2', '3']);
-
         isSame(
             'Value "invalid" is not allowed. Allowed values: ["1", "2", "3"]',
             $rule->test('invalid'),
         );
+
+        $rule = $this->create([]);
+        isSame(
+            'Allowed values are not defined',
+            $rule->test('invalid'),
+        );
     }
 
     public function testInvalidOption(): void
diff --git a/tests/Rules/Cell/DateFormatTest.php b/tests/Rules/Cell/DateFormatTest.php
index 8c4ecd6b..7618cf51 100644
--- a/tests/Rules/Cell/DateFormatTest.php
+++ b/tests/Rules/Cell/DateFormatTest.php
@@ -43,5 +43,11 @@ public function testNegative(): void
             'Date format of value "2000-01-02 12:34:56" is not valid. Expected format: "Y-m-d"',
             $rule->test('2000-01-02 12:34:56'),
         );
+
+        $rule = $this->create('');
+        isSame(
+            'Date format is not defined',
+            $rule->test('12'),
+        );
     }
 }
diff --git a/tests/Rules/Cell/IsTrimmedTest.php b/tests/Rules/Cell/IsTrimmedTest.php
new file mode 100644
index 00000000..1f9ea071
--- /dev/null
+++ b/tests/Rules/Cell/IsTrimmedTest.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * JBZoo Toolbox - Csv-Blueprint.
+ *
+ * This file is part of the JBZoo Toolbox project.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT
+ * @copyright  Copyright (C) JBZoo.com, All rights reserved.
+ * @see        https://github.com/JBZoo/Csv-Blueprint
+ */
+
+declare(strict_types=1);
+
+namespace JBZoo\PHPUnit\Rules\Cell;
+
+use JBZoo\CsvBlueprint\Rules\Cell\IsTrimmed;
+use JBZoo\PHPUnit\Rules\AbstractCellRule;
+
+use function JBZoo\PHPUnit\isSame;
+
+final class IsTrimmedTest extends AbstractCellRule
+{
+    protected string $ruleClass = IsTrimmed::class;
+
+    public function testPositive(): void
+    {
+        $rule = $this->create(true);
+        isSame('', $rule->test(''));
+        isSame('', $rule->test('Hello world!'));
+    }
+
+    public function testNegative(): void
+    {
+        $rule = $this->create(true);
+        isSame('Value "Hello world! " is not trimmed', $rule->test('Hello world! '));
+        isSame('Value " Hello world!" is not trimmed', $rule->test(' Hello world!'));
+        isSame('Value " Hello world! " is not trimmed', $rule->test(' Hello world! '));
+    }
+}
diff --git a/tests/Rules/Cell/NotAllowValuesTest.php b/tests/Rules/Cell/NotAllowValuesTest.php
index 795d0193..b3cc8f3d 100644
--- a/tests/Rules/Cell/NotAllowValuesTest.php
+++ b/tests/Rules/Cell/NotAllowValuesTest.php
@@ -40,16 +40,11 @@ public function testPositive(): void
     public function testNegative(): void
     {
         $rule = $this->create(['invalid', ' ']);
+        isSame('Value "invalid" is not allowed', $rule->test('invalid'));
+        isSame('Value " " is not allowed', $rule->test(' '));
 
-        isSame(
-            'Value "invalid" is not allowed',
-            $rule->test('invalid'),
-        );
-
-        isSame(
-            'Value " " is not allowed',
-            $rule->test(' '),
-        );
+        $rule = $this->create([]);
+        isSame('Not allowed values are not defined', $rule->test('invalid'));
     }
 
     public function testInvalidOption(): void
diff --git a/tests/Rules/Cell/RegexTest.php b/tests/Rules/Cell/RegexTest.php
index 0a5a0e33..1dbf1517 100644
--- a/tests/Rules/Cell/RegexTest.php
+++ b/tests/Rules/Cell/RegexTest.php
@@ -43,15 +43,12 @@ public function testPositive(): void
     public function testNegative(): void
     {
         $rule = $this->create('/^a/');
-        isSame(
-            'Value "1bc" does not match the pattern "/^a/"',
-            $rule->test('1bc'),
-        );
+        isSame('Value "1bc" does not match the pattern "/^a/"', $rule->test('1bc'));
 
         $rule = $this->create('^a');
-        isSame(
-            'Value "1bc" does not match the pattern "/^a/"',
-            $rule->test('1bc'),
-        );
+        isSame('Value "1bc" does not match the pattern "/^a/"', $rule->test('1bc'));
+
+        $rule = $this->create('');
+        isSame('Regex pattern is not defined', $rule->test('1bc'));
     }
 }
diff --git a/tests/Rules/Cell/StratsWithTest.php b/tests/Rules/Cell/StratsWithTest.php
index 4f9634df..b23d962f 100644
--- a/tests/Rules/Cell/StratsWithTest.php
+++ b/tests/Rules/Cell/StratsWithTest.php
@@ -32,21 +32,18 @@ public function testPositive(): void
         isSame('', $rule->test('a'));
         isSame('', $rule->test('abc'));
         isSame(null, $rule->validate(''));
+
+        $rule = $this->create('a');
+        isSame('', $rule->test(''));
     }
 
     public function testNegative(): void
     {
         $rule = $this->create('a');
 
-        isSame(
-            'Value " a" must start with "a"',
-            $rule->test(' a'),
-        );
+        isSame('Value " a" must start with "a"', $rule->test(' a'));
 
         $rule = $this->create('');
-        isSame(
-            'Rule must contain a prefix value in schema file.',
-            $rule->test('a '),
-        );
+        isSame('Rule must contain a prefix value in schema file.', $rule->test('a '));
     }
 }
diff --git a/tests/UtilsTest.php b/tests/UtilsTest.php
index adf068a6..9ebff7b4 100644
--- a/tests/UtilsTest.php
+++ b/tests/UtilsTest.php
@@ -51,6 +51,7 @@ public function testFindFiles(): void
         ])));
 
         isSame([], $this->getFileName(Utils::findFiles([])));
+        isSame([], $this->getFileName(Utils::findFiles([''])));
 
         $this->getFileName(Utils::findFiles(['*.qwerty']));