Fix typo in check for value length

Author: christopher-wild

causal_testing/testing/causal_test_outcome.py

@@ -94,7 +94,7 @@ class Positive(SomeEffect):
     def apply(self, res: CausalTestResult) -> bool:
         if res.ci_valid() and not super().apply(res):
             return False
-        if len(res.test_value.value > 0):
+        if len(res.test_value.value) > 1:
             raise ValueError("Positive Effects are currently only supported on single float datatypes")
         if res.test_value.type in {"ate", "coefficient"}:
             return bool(res.test_value.value[0] > 0)
@@ -109,7 +109,7 @@ class Negative(SomeEffect):
     def apply(self, res: CausalTestResult) -> bool:
         if res.ci_valid() and not super().apply(res):
             return False
-        if len(res.test_value.value > 0):
+        if len(res.test_value.value) > 1:
             raise ValueError("Negative Effects are currently only supported on single float datatypes")
         if res.test_value.type in {"ate", "coefficient"}:
             return bool(res.test_value.value[0] < 0)