diff --git a/.results.json b/.results.json
new file mode 100644
index 0000000..6691eec
--- /dev/null
+++ b/.results.json
@@ -0,0 +1 @@
+{"stats": {"passes": 1, "skipped": 0, "encoding": "UTF-8", "errors": 0, "failures": 0, "total": 1}, "results": [{"classname": "tests.test_is_rotation:TestIs_rotation", "type": "success", "name": "test_is_rotation", "time": 0.009854793548583984}]}
\ No newline at end of file
diff --git a/build.py b/build.py
index e69de29..a656c0d 100644
--- a/build.py
+++ b/build.py
@@ -0,0 +1,3 @@
+def is_rotation(s1, s2):
+    return False if s1 is None or s2 is None else\
+           True  if len(s1) == len(s2) and s2 in s1*2 else False
diff --git a/build.pyc b/build.pyc
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index 0000000..410fa88
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
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index 0000000..477f2d5
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diff --git a/tests/test_is_rotation.pyc b/tests/test_is_rotation.pyc
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index 0000000..98ed729
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