diff --git a/affinity_effect_calculator/tests/data/sample_input.json b/affinity_effect_calculator/tests/data/sample_input.json
new file mode 100644
index 0000000..04b1320
--- /dev/null
+++ b/affinity_effect_calculator/tests/data/sample_input.json
@@ -0,0 +1,5 @@
+{
+  "effect_4x": 1.35,
+  "effect_2x": 0.85,
+  "calculated_effect": 0.5
+}
\ No newline at end of file