Add regression test

Closes sympy/sympy#21999
skirpichev · Sep 2, 2021 · 17a3b07 · 17a3b07
1 parent e3d1e88
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diff --git a/diofant/tests/solvers/test_polysys.py b/diofant/tests/solvers/test_polysys.py
@@ -338,3 +338,8 @@ def test_solve_surd_system():
     res = [{x: 17*y**2/288 - sqrt(y**4 - 1440)/288},
            {x: 17*y**2/288 + sqrt(y**4 - 1440)/288}]
     assert solve_surd_system(eqs, x) == res
+
+
+def test_sympyissue_21999():
+    assert solve_poly_system([x - 1], x, y) == [{x: 1}]
+    assert solve_poly_system([y - 1], x, y) == [{y: 1}]
diff --git a/docs/release/notes-0.13.rst b/docs/release/notes-0.13.rst
@@ -128,3 +128,4 @@ These Sympy issues also were addressed:
 * :sympyissue:`21905`: raise NotImplementedError("Equation not in exact domain. Try converting to rational") Error
 * :sympyissue:`21938`: Series raises an error at infinity for an example which can be solved by aseries
 * :sympyissue:`21984`: ValueError: list.remove(x): x not in list occurs in nonlinsolve
+* :sympyissue:`21999`: detection of infinite solution request