Fix deprecated pytest imports (#7)

* Fix deprecated pytest raises import

* Update pulp_engine variable lower bound definition

* Update releases documentation

Author: idapena

docs/release-notes.md

@@ -12,6 +12,20 @@ hide:
 
 [//]: # (--------------------------------------------------------------------------------------------------------------)
 
+## [v0.1.3](https://github.com/dapensoft/pyorlib/releases/tag/0.1.3) <small>July 30, 2025</small> { id="0.1.3" }
+
+<hr class="divider">
+
+##### Changed
+
+- Updated the lower bound variable definition in `pulp_engine` to set it to `None` when `-inf` is specified as the lower bound.
+
+##### Fixed
+
+- Updated deprecated `_pytest.python_api.raises` imports in several tests.
+
+[//]: # (--------------------------------------------------------------------------------------------------------------)
+
 ## [v0.1.2](https://github.com/dapensoft/pyorlib/releases/tag/0.1.2) <small>April 9, 2024</small> { id="0.1.2" }
 
 <hr class="divider">

src/pyorlib/__init__.py

@@ -3,7 +3,7 @@
 mathematical models in a standardized manner across different optimization packages.
 """
 
-__version__ = "0.1.2"
+__version__ = "0.1.3"
 
 from .engines import Engine
 from .model import Model

src/pyorlib/engines/pulp/pulp_engine.py

@@ -100,14 +100,14 @@ def __init__(
                 pulp_var = LpVariable(
                     name=name,
                     cat=LpInteger,
-                    lowBound=lower_bound,
+                    lowBound=lower_bound if lower_bound > -inf else None,
                     upBound=upper_bound if upper_bound < inf else None,
                 )
             elif self.value_type == ValueType.CONTINUOUS:
                 pulp_var = LpVariable(
                     name=name,
                     cat=LpContinuous,
-                    lowBound=lower_bound,
+                    lowBound=lower_bound if lower_bound > -inf else None,
                     upBound=upper_bound if upper_bound < inf else None,
                 )
             else:

tests/algebra/expressions/test_expression.py

@@ -1,6 +1,6 @@
 from math import isclose
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.algebra import Element, Expression
 

tests/algebra/terms/constants/test_constant.py

@@ -1,6 +1,6 @@
 from math import inf
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.algebra import Term, Constant
 from pyorlib.enums import ValueType, TermType

tests/algebra/terms/test_term.py

@@ -1,7 +1,7 @@
 from math import isclose
 from typing import Any
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.algebra import Element, Expression, Term, Constant
 from pyorlib.enums import ValueType

tests/algebra/terms/variables/test_variable.py

@@ -1,6 +1,6 @@
 from math import inf
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.algebra import Term, Variable
 from pyorlib.engines import Engine

tests/model/test_model.py

@@ -1,7 +1,7 @@
 from math import inf
 from typing import List
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib import Model, Engine
 from pyorlib.algebra import Term, Element

tests/structures/parameters/test_multi_value_parameter.py

@@ -1,6 +1,6 @@
 from math import inf
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.enums import ParameterType, ValueType
 from pyorlib.structures import MultiValueParameter, Parameter

tests/structures/parameters/test_single_value_parameter.py

@@ -1,6 +1,6 @@
 from math import inf
 
-from _pytest.python_api import raises
+from pytest import raises
 
 from pyorlib.enums import ParameterType, ValueType
 from pyorlib.structures import SingleValueParameter, Parameter