test: remove breakpoints and update coverage on expressions

ilpy/expressions.py

@@ -34,7 +34,7 @@ def as_constraint(self) -> Constraint:
 
     def as_objective(self, sense: Sense = Sense.Minimize) -> Objective:
         """Create a linear objective from this expression."""
-        if _get_relation(self) is not None:
+        if _get_relation(self) is not None:  # pragma: no cover
             # TODO: may be supported in the future, eg. for piecewise objectives?
             raise ValueError(f"Objective function cannot have comparisons: {self}")
 
@@ -94,7 +94,7 @@ def __mul__(self, other: Any) -> BinOp | Constant:
         return BinOp(self, ast.Mult(), other)
 
     def __rmul__(self, other: Number) -> BinOp | Constant:
-        if not isinstance(other, (int, float)):
+        if not isinstance(other, (int, float)):  # pragma: no cover
             raise TypeError("Right multiplication must be with a number")
         return Constant(other) * self
 
@@ -191,7 +191,7 @@ def __mul__(self, other: Any) -> BinOp | Constant:
         return super().__mul__(other)
 
     def __pow__(self, other: Number) -> Expression:
-        if not isinstance(other, (int, float)):
+        if not isinstance(other, (int, float)):  # pragma: no cover
             raise TypeError("Exponent must be a number")
         return Constant(self.value**other)
 
@@ -210,20 +210,20 @@ def __init__(self, id: str, index: int | None = None) -> None:
         super().__init__(str(id), ctx=ast.Load())
 
     def __pow__(self, other: Number) -> Expression:
-        if not isinstance(other, (int, float)):
+        if not isinstance(other, (int, float)):  # pragma: no cover
             raise TypeError("Exponent must be a number")
         if other == 2:
             return BinOp(self, ast.Mult(), self)
         elif other == 1:
             return self
-        raise ValueError("Only quadratic variables are supported")
+        raise ValueError("Only quadratic variables are supported")  # pragma: no cover
 
     def __hash__(self) -> int:
         # allow use as dict key
         return id(self)
 
     def __int__(self) -> int:
-        if self.index is None:
+        if self.index is None:  # pragma: no cover
             raise TypeError(f"Variable {self!r} has no index")
         return int(self.index)
 
@@ -247,7 +247,7 @@ def _get_relation(expr: Expression) -> Relation | None:
     relation: Relation | None = None
     for sub in ast.walk(expr):
         if isinstance(sub, Compare):
-            if seen_compare:
+            if seen_compare:  # pragma: no cover
                 raise ValueError("Only single comparisons are supported")
 
             op_type = type(sub.ops[0])
@@ -318,14 +318,10 @@ def _get_coefficients(
         coeffs = {}
 
     if isinstance(expr, Constant):
-        if var_scale is not None:
-            breakpoint()
         coeffs.setdefault(None, 0)
         coeffs[None] += expr.value * scale
 
     elif isinstance(expr, UnaryOp):
-        if var_scale is not None:
-            breakpoint()
         if isinstance(expr.op, ast.USub):
             scale = -scale
         _get_coefficients(expr.operand, coeffs, scale, var_scale)
@@ -341,7 +337,7 @@ def _get_coefficients(
             coeffs[expr] += scale
 
     elif isinstance(expr, Compare):
-        if len(expr.ops) != 1:
+        if len(expr.ops) != 1:  # pragma: no cover
             raise ValueError("Only single comparisons are supported")
         _get_coefficients(expr.left, coeffs, scale, var_scale)
         # negate the right hand side of the comparison
@@ -355,10 +351,10 @@ def _get_coefficients(
             if isinstance(expr.op, (ast.USub, ast.Sub)):
                 scale = -scale
             _get_coefficients(expr.right, coeffs, scale, var_scale)
-        else:
+        else:  # pragma: no cover
             raise ValueError(f"Unsupported binary operator: {type(expr.op)}")
 
-    else:
+    else:  # pragma: no cover
         raise ValueError(f"Unsupported expression type: {type(expr)}")
 
     return coeffs
@@ -396,10 +392,10 @@ def _process_mult_op(
             raise TypeError("Cannot multiply by more than two variables.")
         _get_coefficients(expr.right, coeffs, scale, expr.left)
     elif isinstance(expr.right, Variable):
-        if var_scale is not None:
+        if var_scale is not None:  # pragma: no cover
             raise TypeError("Cannot multiply by more than two variables.")
         _get_coefficients(expr.left, coeffs, scale, expr.right)
-    else:
+    else:  # pragma: no cover
         raise TypeError(
             "Unexpected multiplcation or division between "
             f"{type(expr.left)} and {type(expr.right)}"