Add isNotEmptyString method: asserts string is not empty, with tests and README update

Author: k2gl

README.md

@@ -166,6 +166,9 @@ fact('abcd')->hasLength(3); // Fails
 
 fact('')->isEmptyString(); // Passes
 fact('hello')->isEmptyString(); // Fails
+
+fact('hello')->isNotEmptyString(); // Passes
+fact('')->isNotEmptyString(); // Fails
 ```
 
 ### Type Checking assertions

src/Traits/StringAssertions.php

@@ -273,5 +273,25 @@ public function isEmptyString(string $message = ''): self
         return $this;
     }
 
+    /**
+     * Asserts that a string is not empty.
+     *
+     * This method checks if the actual value is not an empty string.
+     *
+     * Example usage:
+     * fact('hello')->isNotEmptyString(); // Passes
+     * fact('')->isNotEmptyString(); // Fails
+     *
+     * @param string $message Optional custom error message.
+     *
+     * @return self Enables fluent chaining of assertion methods.
+     */
+    public function isNotEmptyString(string $message = ''): self
+    {
+        Assert::assertNotEmpty($this->variable, $message);
+
+        return $this;
+    }
+
     // endregion Length Methods
 }

tests/FluentAssertions/Asserts/IsNotEmptyString/IsNotEmptyStringTest.php

@@ -0,0 +1,50 @@
+<?php declare(strict_types=1);
+
+namespace K2gl\PHPUnitFluentAssertions\Tests\FluentAssertions\Asserts\IsNotEmptyString;
+
+use K2gl\PHPUnitFluentAssertions\Tests\FluentAssertions\FluentAssertionsTestCase;
+use K2gl\PHPUnitFluentAssertions\FluentAssertions;
+use PHPUnit\Framework\Attributes\CoversMethod;
+use PHPUnit\Framework\Attributes\DataProvider;
+
+use function K2gl\PHPUnitFluentAssertions\fact;
+
+#[CoversMethod(className: FluentAssertions::class, methodName: 'isNotEmptyString')]
+final class IsNotEmptyStringTest extends FluentAssertionsTestCase
+{
+    #[DataProvider('isNotEmptyStringDataProvider')]
+    public function testIsNotEmptyString(mixed $variable): void
+    {
+        // act
+        fact($variable)->isNotEmptyString();
+
+        // assert
+        $this->correctAssertionExecuted();
+    }
+
+    #[DataProvider('notIsNotEmptyStringDataProvider')]
+    public function testNotIsNotEmptyString(mixed $variable): void
+    {
+        // assert
+        $this->incorrectAssertionExpected();
+
+        // act
+        fact($variable)->isNotEmptyString();
+    }
+
+    public static function isNotEmptyStringDataProvider(): array
+    {
+        return [
+            ['a'],
+            ['hello'],
+            [' '],
+        ];
+    }
+
+    public static function notIsNotEmptyStringDataProvider(): array
+    {
+        return [
+            [''],
+        ];
+    }
+}