def test_str_repr(self):
"""Test str and repr"""
with self.subTest("5 variables"):
n = 5
quadratic_program = QuadraticProgram()
quadratic_program.binary_var_list(n) # x0,...,x4
expr = LinearExpression(quadratic_program,
[float(e) for e in range(n)])
self.assertEqual(str(expr), "x1 + 2*x2 + 3*x3 + 4*x4")
self.assertEqual(repr(expr),
"<LinearExpression: x1 + 2*x2 + 3*x3 + 4*x4>")
with self.subTest("50 variables"):
# pylint: disable=cyclic-import
from qiskit_optimization.translators.prettyprint import DEFAULT_TRUNCATE
n = 50
quadratic_program = QuadraticProgram()
quadratic_program.binary_var_list(n) # x0,...,x49
expr = LinearExpression(quadratic_program,
[float(e) for e in range(n)])
expected = " ".join(["x1"] +
sorted([f"+ {i}*x{i}" for i in range(2, n)],
key=lambda e: e.split(" ")[1]))
self.assertEqual(str(expr), expected)
self.assertEqual(
repr(expr),
f"<LinearExpression: {expected[:DEFAULT_TRUNCATE]}...>")
