Add regression test

Fixes sympy/sympy#12180
diofant · Feb 17, 2017 · 7083c4c · 7083c4c
1 parent eaf0b10
commit 7083c4c
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diff --git a/diofant/solvers/tests/test_solvers.py b/diofant/solvers/tests/test_solvers.py
@@ -1490,3 +1490,11 @@ def test_sympyissue_12114():
                   b: -sqrt(3)*f/2 + sqrt(-f**2 + 2)/2, c: -sqrt(-f**2 + 2),
                   d: -f/2 + sqrt(-3*f**2 + 6)/2,
                   e: -f/2 - sqrt(3)*sqrt(-f**2 + 2)/2, g: 2}]
+
+
+def test_sympyissue_12180():
+    e1, e2 = x - y*b, x*a - y
+    assert (solve(e1, [x, y], dict=True) ==
+            solve(e1, x, y, dict=True) == [{x: y*b}])
+    assert (solve(e2, [x, y], dict=True) ==
+            solve(e2, x, y, dict=True) == [{x: y/a}])
diff --git a/docs/release/notes-0.9.rst b/docs/release/notes-0.9.rst
@@ -94,6 +94,7 @@ Issues closed
 * `#371 <https://github.com/diofant/diofant/issues/371>`_ Better documentation for BaseSymbol
 * `#432 <https://github.com/diofant/diofant/issues/432>`_ Permission to use your patches in SymPy
 * `#431 <https://github.com/diofant/diofant/issues/431>`_ minpoly() is wrong for AlgebraicNumber's with coeffs != (1, 0)
+* `sympy/sympy#12180 <https://github.com/sympy/sympy/issues/12180>`_ Confusing output from sympy.solve
 
 .. last pr: #433