Add SMS bulk delay configuration and validate coupon phone function

tests/Unit/SmsMessageAnalyzerTest.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Services\SmsMessageAnalyzer;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Tests\TestCase;
+
+class SmsMessageAnalyzerTest extends TestCase
+{
+    private SmsMessageAnalyzer $analyzer;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->analyzer = new SmsMessageAnalyzer;
+    }
+
+    public function test_empty_message_has_zero_parts(): void
+    {
+        $this->assertSame(0, $this->analyzer->estimatedParts(''));
+    }
+
+    public function test_gsm_single_part_message(): void
+    {
+        $message = str_repeat('A', 160);
+
+        $this->assertTrue($this->analyzer->isGsm7($message));
+        $this->assertSame(1, $this->analyzer->estimatedParts($message));
+    }
+
+    public function test_gsm_multi_part_message(): void
+    {
+        $message = str_repeat('A', 161);
+
+        $this->assertSame(2, $this->analyzer->estimatedParts($message));
+    }
+
+    public function test_unicode_single_part_message(): void
+    {
+        $message = 'Привет';
+
+        $this->assertFalse($this->analyzer->isGsm7($message));
+        $this->assertSame(1, $this->analyzer->estimatedParts($message));
+    }
+
+    public function test_unicode_multi_part_message(): void
+    {
+        $message = str_repeat('Я', 71);
+
+        $this->assertSame(2, $this->analyzer->estimatedParts($message));
+    }
+
+    #[DataProvider('summaryProvider')]
+    public function test_summary(string $message, string $expectedSubstring): void
+    {
+        $this->assertStringContainsString($expectedSubstring, $this->analyzer->summary($message));
+    }
+
+    /**
+     * @return array<string, array{0: string, 1: string}>
+     */
+    public static function summaryProvider(): array
+    {
+        return [
+            'empty' => ['', '0 characters'],
+            'gsm' => ['Hello', '5 characters · 1 SMS'],
+            'unicode' => ['你好', '2 characters · 1 SMS'],
+        ];
+    }
+}