diff --git a/tests/DecoderTest.php b/tests/DecoderTest.php
index 9925d66..a27f8bb 100644
--- a/tests/DecoderTest.php
+++ b/tests/DecoderTest.php
@@ -401,6 +401,18 @@ public static function getDecodeInvalidTests()
 				'd4',
 				new DecodingException('Premature end of data', 1)
 			],
+			[
+				'd0',
+				new DecodingException('Premature end of data', 1)
+			],
+			[
+				'd',
+				new DecodingException('Premature end of data', 0)
+			],
+			[
+				'dd',
+				new DecodingException('Illegal character', 1)
+			],
 			[
 				'ld1',
 				new DecodingException('Premature end of data', 2)