add pattern Interpreter

Behavioral/Interpreter/Tests/InterpreterTest.php

@@ -0,0 +1,63 @@
+<?php declare(strict_types=1);
+
+namespace DesignPatterns\Behavioral\Interpreter\Tests;
+
+use DesignPatterns\Behavioral\Interpreter\AndExp;
+use DesignPatterns\Behavioral\Interpreter\Context;
+use DesignPatterns\Behavioral\Interpreter\OrExp;
+use DesignPatterns\Behavioral\Interpreter\VariableExp;
+use PHPUnit\Framework\TestCase;
+
+class InterpreterTest extends TestCase
+{
+    private Context $context;
+    private VariableExp $a;
+    private VariableExp $b;
+    private VariableExp $c;
+
+    public function setUp(): void
+    {
+        $this->context = new Context();
+        $this->a = new VariableExp('A');
+        $this->b = new VariableExp('B');
+        $this->c = new VariableExp('C');
+    }
+
+    public function testOr()
+    {
+        $this->context->assign($this->a, false);
+        $this->context->assign($this->b, false);
+        $this->context->assign($this->c, true);
+
+        // A ∨ B
+        $exp1 = new OrExp($this->a, $this->b);
+        $result1 = $exp1->interpret($this->context);
+
+        $this->assertFalse($result1, 'A ∨ B must false');
+
+        // $exp1 ∨ C
+        $exp2 = new OrExp($exp1, $this->c);
+        $result2 = $exp2->interpret($this->context);
+
+        $this->assertTrue($result2, '(A ∨ B) ∨ C must true');
+    }
+
+    public function testAnd()
+    {
+        $this->context->assign($this->a, true);
+        $this->context->assign($this->b, true);
+        $this->context->assign($this->c, false);
+
+        // A ∧ B
+        $exp1 = new AndExp($this->a, $this->b);
+        $result1 = $exp1->interpret($this->context);
+
+        $this->assertTrue($result1, 'A ∧ B must true');
+
+        // $exp1 ∧ C
+        $exp2 = new AndExp($exp1, $this->c);
+        $result2 = $exp2->interpret($this->context);
+
+        $this->assertFalse($result2, '(A ∧ B) ∧ C must false');
+    }
+}