Task 1: Calculator init

tasks/task_01/.phpunit.result.cache

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+{"version":1,"defects":[],"times":{"Tests\\CalculatorTest::testAdd":0.007,"Tests\\CalculatorTest::testSubtract":0,"Tests\\CalculatorTest::testMultiply":0,"Tests\\CalculatorTest::testDivide":0,"Tests\\CalculatorTest::testDivideByZero":0.001}}

tasks/task_01/composer.json

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+{
+    "name": "oskar/task_01",
+    "type": "project",
+    "autoload": {
+        "psr-4": {
+            "App\\": "src/"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^10.5"
+    }
+}

tasks/task_01/index.php

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+<?php
+
+declare(strict_types=1);
+
+require 'vendor/autoload.php';
+
+use App\Calculator;
+use App\Operation;
+
+try {
+    $calculator = new Calculator();
+
+    $result = $calculator->calculate(10, 5, Operation::ADD);
+    echo "Wynik dodawania: $result\n";
+
+    $result = $calculator->calculate(10, 5, Operation::SUBTRACT);
+    echo "Wynik odejmowania: $result\n";
+
+    $result = $calculator->calculate(10, 5, Operation::MULTIPLY);
+    echo "Wynik mnożenia: $result\n";
+
+    $result = $calculator->calculate(10, 5, Operation::DIVIDE);
+    echo "Wynik dzielenia: $result\n";
+} catch (InvalidArgumentException $e) {
+    echo 'Błąd: ' . $e->getMessage();
+}

tasks/task_01/phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php">
+    <testsuites>
+        <testsuite name="My Test Suite">
+            <directory>./tests</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

tasks/task_01/src/Calculator.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+use InvalidArgumentException;
+
+class Calculator implements CalculatorInterface
+{
+    public function calculate(float $a, float $b, Operation $operation): float
+    {
+        return match ($operation) {
+            Operation::ADD => $this->add($a, $b),
+            Operation::SUBTRACT => $this->subtract($a, $b),
+            Operation::MULTIPLY => $this->multiply($a, $b),
+            Operation::DIVIDE => $this->divide($a, $b),
+        };
+    }
+
+    private function add(float $a, float $b): float
+    {
+        return $a + $b;
+    }
+
+    private function subtract(float $a, float $b): float
+    {
+        return $a - $b;
+    }
+
+    private function multiply(float $a, float $b): float
+    {
+        return $a * $b;
+    }
+
+    private function divide(float $a, float $b): float
+    {
+        if ($b === 0.0) {
+            throw new InvalidArgumentException('Division by zero is not allowed.');
+        }
+        return $a / $b;
+    }
+}

tasks/task_01/src/CalculatorInterface.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+interface CalculatorInterface
+{
+    public function calculate(float $a, float $b, Operation $operation): float;
+}

tasks/task_01/src/Operation.php

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+<?php
+
+declare(strict_types=1);
+
+namespace App;
+
+enum Operation: string {
+    case ADD = 'add';
+    case SUBTRACT = 'subtract';
+    case MULTIPLY = 'multiply';
+    case DIVIDE = 'divide';
+}

tasks/task_01/tests/CalculatorTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use PHPUnit\Framework\TestCase;
+use App\Calculator;
+use App\Operation;
+use InvalidArgumentException;
+
+class CalculatorTest extends TestCase
+{
+    private Calculator $calculator;
+
+    protected function setUp(): void
+    {
+        $this->calculator = new Calculator();
+    }
+
+    public function testAdd(): void
+    {
+        $result = $this->calculator->calculate(10, 5, Operation::ADD);
+        $this->assertEquals(15, $result);
+    }
+
+    public function testSubtract(): void
+    {
+        $result = $this->calculator->calculate(10, 5, Operation::SUBTRACT);
+        $this->assertEquals(5, $result);
+    }
+
+    public function testMultiply(): void
+    {
+        $result = $this->calculator->calculate(10, 5, Operation::MULTIPLY);
+        $this->assertEquals(50, $result);
+    }
+
+    public function testDivide(): void
+    {
+        $result = $this->calculator->calculate(10, 5, Operation::DIVIDE);
+        $this->assertEquals(2, $result);
+    }
+
+    public function testDivideByZero(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->calculator->calculate(10, 0, Operation::DIVIDE);
+    }
+}