at the end of the day, it was inevitable

tests/AppTestCaseTrait.php

@@ -0,0 +1,94 @@
+<?php
+
+namespace Tests;
+
+use Common\Util\Matcher\AppMatcher;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Trait AppTestCaseTrait
+ * @package Tests
+ */
+trait AppTestCaseTrait
+{
+
+    /**
+     * Call public, protected or private specified object method.
+     *
+     * @param object $object Object on which we should call method.
+     * @param string $method Called method.
+     * @param array  $params Called method parameters.
+     *
+     * @return mixed
+     */
+    protected function call($object, $method, array $params = [])
+    {
+        $methodReflection = new \ReflectionMethod($object, $method);
+        $methodReflection->setAccessible(true);
+
+        return $methodReflection->invokeArgs($object, $params);
+    }
+
+    /**
+     * Get public, protected or private property of specified object.
+     *
+     * @param object $object   Object from which we should get property.
+     * @param string $property Required property name.
+     *
+     * @return mixed
+     */
+    protected function getProperty($object, $property)
+    {
+        $propertyReflection = new \ReflectionProperty($object, $property);
+        $propertyReflection->setAccessible(true);
+
+        return $propertyReflection->getValue($object);
+    }
+
+    /**
+     * Assert that specified value matched to given pattern.
+     * Uses coduo/php-matcher.
+     *
+     * @param mixed  $value   Matched value.
+     * @param mixed  $pattern Expected pattern.
+     * @param string $message Custom error message.
+     *
+     * @return void
+     */
+    protected static function assertMatch($value, $pattern, $message = null)
+    {
+        self::assertTrue(
+            AppMatcher::match($value, $pattern, $error),
+            $message ? $message . PHP_EOL . $error : $error
+        );
+    }
+
+    /**
+     * @param string $className Interface fqcn.
+     *
+     * @return \PHPUnit_Framework_MockObject_MockObject
+     */
+    protected function getMockForInterface($className)
+    {
+        if (! $this instanceof TestCase) {
+            throw new \LogicException('AppTestCaseTrait should be used by subclasses od TestCase');
+        }
+
+        return $this->getMockBuilder($className)
+            ->disableOriginalConstructor()
+            ->setMethods($this->getClassMethods($className))
+            ->getMock();
+    }
+
+    /**
+     * @param string $class A abstract class fqcn.
+     *
+     * @return string[]
+     */
+    protected function getClassMethods($class)
+    {
+        $reflection = new \ReflectionClass($class);
+
+        return \nspl\a\map(\nspl\op\methodCaller('getName'), $reflection->getMethods());
+    }
+}