Add IntTiny type for TINYINT range validation with tests and alias …

src/Integer/Alias/TinyInt.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpTypedValues\Integer\Alias;
+
+use PhpTypedValues\Integer\DB\IntTiny;
+
+/**
+ * Alias of IntTiny.
+ *
+ * Example "1"
+ *
+ * @psalm-immutable
+ */
+readonly class TinyInt extends IntTiny
+{
+}

src/Integer/DB/IntTiny.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpTypedValues\Integer\DB;
+
+use PhpTypedValues\Abstract\Integer\IntType;
+use PhpTypedValues\Exception\IntegerTypeException;
+
+use function sprintf;
+
+/**
+ * Database tiny integer (TINYINT signed: -128..127).
+ *
+ * Example "-5"
+ *
+ * @psalm-immutable
+ */
+readonly class IntTiny extends IntType
+{
+    /** @var int<-128, 127> */
+    protected int $value;
+
+    /**
+     * @throws IntegerTypeException
+     */
+    public function __construct(int $value)
+    {
+        if ($value < -128 || $value > 127) {
+            throw new IntegerTypeException(sprintf('Expected tiny integer in range -128..127, got "%d"', $value));
+        }
+
+        $this->value = $value;
+    }
+
+    /**
+     * @throws IntegerTypeException
+     */
+    public static function fromInt(int $value): static
+    {
+        return new static($value);
+    }
+
+    /**
+     * @throws IntegerTypeException
+     */
+    public static function fromString(string $value): static
+    {
+        parent::assertIntegerString($value);
+
+        return new static((int) $value);
+    }
+
+    /**
+     * @return int<-128, 127>
+     */
+    public function value(): int
+    {
+        return $this->value;
+    }
+}

src/psalmTest.php

@@ -20,6 +20,8 @@
 use PhpTypedValues\Integer\Alias\IntType;
 use PhpTypedValues\Integer\Alias\NonNegativeInt;
 use PhpTypedValues\Integer\Alias\PositiveInt;
+use PhpTypedValues\Integer\Alias\TinyInt;
+use PhpTypedValues\Integer\DB\IntTiny;
 use PhpTypedValues\Integer\IntegerNonNegative;
 use PhpTypedValues\Integer\IntegerPositive;
 use PhpTypedValues\Integer\IntegerStandard;
@@ -37,6 +39,11 @@
 testNonNegativeInt(IntegerNonNegative::fromInt(10)->value());
 testWeekDayInt(IntegerWeekDay::fromInt(7)->value());
 
+// DB tinyint usage
+echo TinyInt::fromInt(-5)->toString() . \PHP_EOL;
+echo IntTiny::fromInt(-5)->toString() . \PHP_EOL;
+echo IntTiny::fromString('127')->toString() . \PHP_EOL;
+
 echo NonNegativeInt::fromString('10')->toString() . \PHP_EOL;
 echo PositiveInt::fromString('10')->toString() . \PHP_EOL;
 echo IntegerStandard::fromString('10')->toString() . \PHP_EOL;

tests/Unit/Integer/DB/IntTinyTest.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+use PhpTypedValues\Exception\IntegerTypeException;
+use PhpTypedValues\Integer\DB\IntTiny;
+
+it('accepts values within signed tinyint range and preserves value', function (): void {
+    $a = new IntTiny(-128);
+    $b = IntTiny::fromInt(0);
+    $c = IntTiny::fromInt(127);
+
+    expect($a->value())->toBe(-128)
+        ->and($a->toString())->toBe('-128')
+        ->and($b->value())->toBe(0)
+        ->and($b->toString())->toBe('0')
+        ->and($c->value())->toBe(127)
+        ->and($c->toString())->toBe('127');
+});
+
+it('fromString parses integers and enforces tinyint bounds', function (): void {
+    $v = IntTiny::fromString('-5');
+    expect($v->value())->toBe(-5)
+        ->and($v->toString())->toBe('-5');
+});
+
+it('throws when value is below -128', function (): void {
+    expect(fn() => new IntTiny(-129))
+        ->toThrow(IntegerTypeException::class, 'Expected tiny integer in range -128..127, got "-129"');
+});
+
+it('throws when value is above 127', function (): void {
+    expect(fn() => IntTiny::fromInt(128))
+        ->toThrow(IntegerTypeException::class, 'Expected tiny integer in range -128..127, got "128"');
+});
+
+it('fromString throws on non-integer strings (strict check)', function (): void {
+    expect(fn() => IntTiny::fromString('12.3'))
+        ->toThrow(IntegerTypeException::class, 'String "12.3" has no valid integer value');
+});