Improve handling of error conditions in BT spec

tests/BencodeTest.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace ApolloRip\BencodeTorrent;
+
+class BencodeTest extends \PHPUnit\Framework\TestCase {
+    public function dataProvider() {
+        return [
+            ['i0e', 0],
+            ['i-1e', -1],
+            ['i20e', 20],
+            ['le', []],
+            ['d4:item5:valuee', ['item' => 'value']],
+            ['0:', ''],
+            ['1:a', 'a'],
+            ['9:123456789', '123456789']
+        ];
+    }
+
+    /**
+     * @dataProvider dataProvider
+     * @param string $bencoded_string
+     * @param mixed  $expected
+     */
+    public function testDecodeEncode($bencoded_string, $expected) {
+        $bencode = new Bencode();
+        $bencode->decodeString($bencoded_string);
+        $this->assertEquals($expected, $bencode->getData());
+        $this->assertEquals($bencoded_string, $bencode->getEncode());
+    }
+
+    public function testEmptyDict() {
+        $bencode = new Bencode();
+        $bencode->decodeString('de');
+        $this->assertEquals([], $bencode->getData());
+        $this->assertEquals('le', $bencode->getEncode());
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testInvalidDictionaryKey() {
+        $bencode = new Bencode();
+        $bencode->decodeString('di1e5:value');
+    }
+
+    public function invalidIntegers() {
+        return [['-0'], ['a'], ['1.0']];
+    }
+
+    /**
+     * @param string $value
+     * @dataProvider invalidIntegers
+     * @expectedException \RuntimeException
+     */
+    public function testInvalidInteger(string $value) {
+        $bencode = new Bencode();
+        $bencode->decodeString("i{$value}e");
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     */
+    public function testInvalidString() {
+        $bencode = new Bencode();
+        $bencode->decodeString('i1e0e');
+    }
+}