diff --git a/solutions/prime_number/test_yavuzdelibasi.py b/solutions/prime_number/test_yavuzdelibasi.py
new file mode 100644
index 0000000..d503d74
--- /dev/null
+++ b/solutions/prime_number/test_yavuzdelibasi.py
@@ -0,0 +1,11 @@
+from prime import is_prime
+import pytest
+
+def test_prime():
+	assert is_prime(7) == True
+	
+def test_big_number():
+    assert is_prime(1559) == True
+
+def test_not_prime():
+    assert is_prime(20) == False