add semi-continuous/semi-integer tests

test/test_lp_var_types.py

@@ -0,0 +1,63 @@
+import pytest
+
+from modeler import LPModel, LPStatus, LPVar, LPVarType
+
+
+def test_semicontinuos() -> None:
+    x = LPVar(
+        "x",
+        lower_bound=19,
+        upper_bound=21,
+        variable_type=LPVarType.SEMICONTINUOUS,
+    )
+
+    y = LPVar(
+        "y",
+        lower_bound=18,
+        upper_bound=20,
+        variable_type=LPVarType.SEMICONTINUOUS,
+    )
+
+    model = LPModel()
+
+    model.add_constraint(x + y >= 10)
+    model.add_constraint(x + y <= 30)
+
+    model.set_objective(-x - y)
+
+    model.solve()
+
+    assert model.status == LPStatus.OPTIMAL
+
+    assert x.value() == pytest.approx(21)
+    assert y.value() == pytest.approx(0)
+
+
+def test_semiinteger() -> None:
+    x = LPVar(
+        "x",
+        lower_bound=19.5,
+        upper_bound=21.5,
+        variable_type=LPVarType.SEMIINTEGER,
+    )
+
+    y = LPVar(
+        "y",
+        lower_bound=18.5,
+        upper_bound=20.5,
+        variable_type=LPVarType.SEMIINTEGER,
+    )
+
+    model = LPModel()
+
+    model.add_constraint(x + y >= 10)
+    model.add_constraint(x + y <= 30)
+
+    model.set_objective(-x - y)
+
+    model.solve()
+
+    assert model.status == LPStatus.OPTIMAL
+
+    assert x.value() == pytest.approx(21)
+    assert y.value() == pytest.approx(0)