diff --git a/jmbitcoin/test/test_bip21.py b/jmbitcoin/test/test_bip21.py
index 711b219..87027ca 100644
--- a/jmbitcoin/test/test_bip21.py
+++ b/jmbitcoin/test/test_bip21.py
@@ -2,6 +2,21 @@ import jmbitcoin as btc
 import pytest
 
 
+def test_is_bip21_uri():
+    # invalid URIs
+    assert(not btc.is_bip21_uri(''))
+    assert(not btc.is_bip21_uri('nfdjksnfjkdsnfjkds'))
+    assert(not btc.is_bip21_uri('175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W'))
+    assert(not btc.is_bip21_uri('175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?amount=20.3'))
+    assert(not btc.is_bip21_uri('bitcoin:'))
+    assert(not btc.is_bip21_uri('bitcoin:?amount=20.3'))
+    # valid URIs
+    assert(btc.is_bip21_uri('bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W'))
+    assert(btc.is_bip21_uri('BITCOIN:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W'))
+    assert(btc.is_bip21_uri('BitCoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W'))
+    assert(btc.is_bip21_uri('bitcoin:175tWpb8K1S7NmH4Zx6rewF9WQrcZv245W?label=Luke-Jr'))
+
+
 def test_bip21_decode():
 
     # These should raise exception because of not being valid BIP21 URI's