Add test for Model/Api/Capabilities

Test/Unit/Model/Api/CapabilitiesTest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Omise\Payment\Test\Unit\Model\Api;
+
+use PHPUnit\Framework\TestCase;
+use Omise\Payment\Model\Api\Capabilities;
+use Omise\Payment\Model\Config\Config;
+use Mockery as m;
+
+class CapabilitiesTest extends TestCase
+{
+    private $configMock;
+    private $omiseCapabilitiesMock;
+
+    protected function setUp(): void
+    {
+        $this->configMock = m::mock(Config::class);
+        $this->configMock->shouldReceive('canInitialize')->andReturn(true);
+        $this->omiseCapabilitiesMock = m::mock('alias:OmiseCapabilities');
+    }
+
+    protected function tearDown(): void
+    {
+        m::close();
+    }
+
+    /**
+     * @covers Omise\Payment\Model\Api\Capabilities
+     */
+    public function testGetInstallmentMinLimit()
+    {
+        $data = [
+            'limits' => [
+                'installment_amount' => [
+                    'min' => 3000
+                ]
+            ]
+        ];
+        $this->omiseCapabilitiesMock->shouldReceive('retrieve')->andReturn($data);
+        $capabilities = new Capabilities($this->configMock);
+        $result = $capabilities->getInstallmentMinLimit();
+
+        $this->assertEquals($data['limits']['installment_amount']['min'], $result);
+    }
+
+    /**
+     * @covers Omise\Payment\Model\Api\Capabilities
+     */
+    public function testGetInstallmentMinLimitReturnsZeroIfCapabilitiesIsNotSet()
+    {
+        $this->omiseCapabilitiesMock->shouldReceive('retrieve')->andReturn(null);
+        $capabilities = new Capabilities($this->configMock);
+        $result = $capabilities->getInstallmentMinLimit();
+
+        $this->assertEquals(0, $result);
+    }
+}