test: add test for paramType property

tests/strategy/test_strategy_parameters.py

@@ -43,6 +43,7 @@ def test_hyperopt_int_parameter():
 
     HyperoptStateContainer.set_state(HyperoptState.OPTIMIZE)
     assert len(list(intpar.range)) == 1
+    assert intpar.param_type == "IntParameter"
 
 
 def test_hyperopt_real_parameter():
@@ -60,6 +61,7 @@ def test_hyperopt_real_parameter():
     assert isinstance(fltpar.get_space(""), FloatDistribution)
 
     assert not hasattr(fltpar, "range")
+    assert fltpar.param_type == "RealParameter"
 
 
 def test_hyperopt_decimal_parameter():
@@ -94,6 +96,7 @@ def test_hyperopt_decimal_parameter():
 
     HyperoptStateContainer.set_state(HyperoptState.OPTIMIZE)
     assert len(list(decimalpar.range)) == 1
+    assert decimalpar.param_type == "DecimalParameter"
 
 
 def test_hyperopt_categorical_parameter():
@@ -133,3 +136,5 @@ def test_hyperopt_categorical_parameter():
     HyperoptStateContainer.set_state(HyperoptState.OPTIMIZE)
     assert len(list(catpar.range)) == 1
     assert len(list(boolpar.range)) == 1
+    assert boolpar.param_type == "BooleanParameter"
+    assert catpar.param_type == "CategoricalParameter"