diff --git a/tests/Unit/Domain/Models/ValueObjects/BrandCodeTest.php b/tests/Unit/Domain/Models/ValueObjects/BrandCodeTest.php
new file mode 100644
index 0000000..d5a2e38
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/BrandCodeTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\BrandCode;
+
+covers(BrandCode::class);
+
+describe('BrandCode Value Object', function (): void {
+    it('accepts valid positive brand codes', function (int $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $brandCode = new BrandCode($value);
+
+        // THEN
+        expect($brandCode->value)->toBe($value);
+    })->with([13, 1, 9999]);
+
+    it('rejects zero or negative brand codes', function (int $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new BrandCode($invalid))
+            ->toThrow(\DomainException::class);
+    })->with([0, -1, -9999]);
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/EstablishmentCodeTest.php b/tests/Unit/Domain/Models/ValueObjects/EstablishmentCodeTest.php
new file mode 100644
index 0000000..776662b
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/EstablishmentCodeTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\EstablishmentCode;
+
+covers(EstablishmentCode::class);
+
+describe('EstablishmentCode Value Object', function (): void {
+    it('accepts valid establishment codes matching pattern', function (string $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $establishmentCode = new EstablishmentCode($value);
+
+        // THEN
+        expect($establishmentCode->value)->toBe($value);
+    })->with(['EST01', '01', 'ESTABLISHMENT', 'A1']);
+
+    it('rejects invalid, lowercase, short or empty establishment codes', function (string $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new EstablishmentCode($invalid))
+            ->toThrow(\DomainException::class);
+    })->with(['est01', 'A', '', 'EST 01', 'EST-01']);
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/IncoCompoIdTest.php b/tests/Unit/Domain/Models/ValueObjects/IncoCompoIdTest.php
new file mode 100644
index 0000000..7060bdb
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/IncoCompoIdTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\IncoCompoId;
+
+covers(IncoCompoId::class);
+
+describe('IncoCompoId Value Object', function (): void {
+    it('accepts valid numeric values', function (string $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $vo = new IncoCompoId($value);
+
+        // THEN
+        expect($vo->value)->toBe($value);
+    })->with(['123', '0', '999999']);
+
+    it('rejects invalid non-numeric or empty values', function (string $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new IncoCompoId($invalid))
+            ->toThrow(\DomainException::class);
+    })->with(['abc', '12a', '', ' 123 ', '-5']);
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/IncoIdTest.php b/tests/Unit/Domain/Models/ValueObjects/IncoIdTest.php
new file mode 100644
index 0000000..01d91e2
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/IncoIdTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\IncoId;
+
+covers(IncoId::class);
+
+describe('IncoId Value Object', function (): void {
+    it('accepts valid numeric values', function (string $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $vo = new IncoId($value);
+
+        // THEN
+        expect($vo->value)->toBe($value);
+    })->with(['100', '1', '88888']);
+
+    it('rejects invalid non-numeric or empty values', function (string $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new IncoId($invalid))
+            ->toThrow(\DomainException::class);
+    })->with(['invalid', '12b', '', ' ', '-1']);
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/ServiceIdTest.php b/tests/Unit/Domain/Models/ValueObjects/ServiceIdTest.php
new file mode 100644
index 0000000..618c4d9
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/ServiceIdTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\ServiceId;
+
+covers(ServiceId::class);
+
+describe('ServiceId Value Object', function (): void {
+    it('accepts valid numeric service identifiers', function (string $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $vo = new ServiceId($value);
+
+        // THEN
+        expect($vo->value)->toBe($value);
+    })->with(['097', '1', '12345']);
+
+    it('rejects non-numeric service identifiers', function (string $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new ServiceId($invalid))
+            ->toThrow(\DomainException::class);
+    })->with(['SERV01', 'abc', '', ' 097 ', '-10']);
+});
diff --git a/tests/Unit/Domain/Models/ValueObjects/SiteIdTest.php b/tests/Unit/Domain/Models/ValueObjects/SiteIdTest.php
new file mode 100644
index 0000000..ed3e844
--- /dev/null
+++ b/tests/Unit/Domain/Models/ValueObjects/SiteIdTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Domain\Models\ValueObjects;
+
+use Domain\Models\ValueObjects\SiteId;
+
+covers(SiteId::class);
+
+describe('SiteId Value Object', function (): void {
+    it('accepts valid uppercase alphabetical site identifiers', function (string $input): void {
+        // GIVEN
+        $value = $input;
+
+        // WHEN
+        $vo = new SiteId($value);
+
+        // THEN
+        expect($vo->value)->toBe($value);
+    })->with(['LDCSER', 'SLELA', 'DDE', 'SITE']);
+
+    it('rejects lowercase, numeric, or too short site identifiers', function (string $invalid): void {
+        // GIVEN / WHEN / THEN
+        expect(fn () => new SiteId($invalid))
+            ->toThrow(\DomainException::class);
+    })->with(['site', 'LDCSER01', 'A', '123', '', 'LD CSER']);
+});