diff --git a/tests/great_ai/__init__.py b/tests/great_ai/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/great_ai/test_basic_starters.py b/tests/great_ai/test_basic_starters.py
new file mode 100644
index 0000000..c5c77b2
--- /dev/null
+++ b/tests/great_ai/test_basic_starters.py
@@ -0,0 +1,59 @@
+import unittest
+from functools import lru_cache
+
+import pytest
+
+from src.great_ai import (
+    ArgumentValidationError,
+    GreatAI,
+    WrongDecoratorOrderError,
+    parameter,
+)
+
+
+class TestHumanReadableToByte(unittest.TestCase):
+    def test_create_simple_cases(self) -> None:
+        @GreatAI.create
+        def hello_world(name: str) -> str:
+            return f"Hello {name}!"
+
+        assert hello_world("andras").output == "Hello andras!"
+
+        @GreatAI.create()
+        def hello_world(name: str) -> str:
+            return f"Hello {name}!"
+
+        assert hello_world("andras").output == "Hello andras!"
+
+    def test_create_with_other_decorator(self) -> None:
+        @GreatAI.create
+        @lru_cache
+        def hello_world(name: str) -> str:
+            return f"Hello {name}!"
+
+        assert hello_world("andras").output == "Hello andras!"
+
+        @lru_cache
+        @GreatAI.create()
+        def hello_world(name: str) -> str:
+            return f"Hello {name}!"
+
+        assert hello_world("andras").output == "Hello andras!"
+
+    def test_with_parameter(self) -> None:
+        @GreatAI.create
+        @parameter("name", validator=lambda v: len(v) > 5)
+        def hello_world(name: str) -> str:
+            return f"Hello {name}!"
+
+        assert hello_world("andras").output == "Hello andras!"
+
+        with pytest.raises(ArgumentValidationError):
+            hello_world("short")
+
+        with pytest.raises(WrongDecoratorOrderError):
+
+            @parameter("name", validator=lambda v: len(v) > 5)
+            @GreatAI.create
+            def hello_world(name: str) -> str:
+                return f"Hello {name}!"
diff --git a/tests/large_file/test_human_readable_to_byte.py b/tests/large_file/test_human_readable_to_byte.py
index 271722e..cc0e995 100644
--- a/tests/large_file/test_human_readable_to_byte.py
+++ b/tests/large_file/test_human_readable_to_byte.py
@@ -12,7 +12,7 @@ class TestHumanReadableToByte(unittest.TestCase):
         assert human_readable_to_byte("0.5KB") == 512
         assert human_readable_to_byte("20.5KB") == 1024 * 20 + 512
 
-    def test_formating(self) -> None:
+    def test_formatting(self) -> None:
         assert human_readable_to_byte(" 1MB") == 1024 * 1024
         assert human_readable_to_byte(" 2  MB") == 1024 * 1024 * 2
         assert human_readable_to_byte("    4   MB ") == 1024 * 1024 * 4