diff --git a/tests/test_strategies.py b/tests/test_strategies.py
index 38503755..3f7350d6 100644
--- a/tests/test_strategies.py
+++ b/tests/test_strategies.py
@@ -43,19 +43,22 @@
 
 FLOAT_STRATEGIES = st.one_of(
     st.integers(),
-    st.floats(min_value=0, max_value=1, allow_nan=False, allow_subnormal=False),
     st.floats(allow_infinity=False, allow_nan=False, allow_subnormal=False),
     st.floats(allow_infinity=True, allow_nan=False, allow_subnormal=False),
     st.floats(allow_infinity=True, allow_nan=False, allow_subnormal=True),
 )
 
+PROBABILITY_STRATEGIES = st.floats(
+    min_value=0, max_value=1, allow_nan=False, allow_subnormal=False
+)
+
 VALUE_TYPE_VALUE_STRATEGY_MAPPING = {
     ValueType.BOOLEAN: st.booleans(),
     ValueType.INTEGER: st.integers(),
     ValueType.REAL: FLOAT_STRATEGIES,
     ValueType.SIGMOID: FLOAT_STRATEGIES,
-    ValueType.PROBABILITY: FLOAT_STRATEGIES,
-    ValueType.PROBABILITY_SAMPLE: FLOAT_STRATEGIES,
+    ValueType.PROBABILITY: PROBABILITY_STRATEGIES,
+    ValueType.PROBABILITY_SAMPLE: PROBABILITY_STRATEGIES,
     ValueType.PROBABILITY_DISTRIBUTION: FLOAT_STRATEGIES,
     ValueType.CLASS: st.text(),
 }
@@ -88,26 +91,41 @@ def variable_strategy(
     variable_label = draw(st.text(max_size=variable_label_max_length))
     units = draw(st.text(max_size=units_max_length))
     is_covariate = draw(st.booleans())
-    type = draw(st.sampled_from(ValueType))
-    dtype = VALUE_TYPE_DTYPE_MAPPING[type]
-    value_strategy = VALUE_TYPE_VALUE_STRATEGY_MAPPING[type]
-
-    value_range = draw(
-        st.one_of(
-            st.none(),
-            st.tuples(value_strategy, value_strategy).map(sorted),
+
+    value_type = draw(st.sampled_from(ValueType))
+
+    dtype = VALUE_TYPE_DTYPE_MAPPING[value_type]
+    value_strategy = VALUE_TYPE_VALUE_STRATEGY_MAPPING[value_type]
+
+    if value_type is ValueType.BOOLEAN:
+        allowed_values = [True, False]
+        value_range = None
+        rescale = 1
+    elif value_type in {
+        ValueType.PROBABILITY,
+        ValueType.PROBABILITY_SAMPLE,
+        ValueType.PROBABILITY_DISTRIBUTION,
+    }:
+        value_range = (0, 1)
+        allowed_values = None
+        rescale = 1
+    else:
+        value_range = draw(
+            st.one_of(
+                st.none(),
+                st.tuples(value_strategy, value_strategy).map(sorted),
+            )
         )
-    )
-    allowed_values = draw(
-        st.one_of(st.none(), st.lists(value_strategy, unique=True, min_size=1))
-    )
-    rescale = draw(st.one_of(st.just(1), value_strategy))
+        allowed_values = draw(
+            st.one_of(st.none(), st.lists(value_strategy, unique=True, min_size=1))
+        )
+        rescale = draw(st.one_of(st.just(1), value_strategy))
 
     v = Variable(
         name=name,
         variable_label=variable_label,
         units=units,
-        type=type,
+        type=value_type,
         is_covariate=is_covariate,
         value_range=value_range,
         allowed_values=allowed_values,