fixes poly ring in test cases

Author: ederc

test/algorithms/solvers.jl

@@ -61,14 +61,14 @@
     @test_throws ErrorException real_solutions(I, interval=true)
 	@test_throws ErrorException rational_solutions(I)
 
+    R, (x, y) = polynomial_ring(QQ,["x","y"])
     # issue 54
     I = Ideal([R(0)])
 	@test_throws ErrorException real_solutions(I)
-    I = Ideal([x1-1,x2+2,R(0)])
+    I = Ideal([x-1,y+2,R(0)])
     @test sort(real_solutions(I)) == sort(Vector{QQFieldElem}[[1, -2]])
 
     # check variable permutation
-    R, (x, y) = polynomial_ring(QQ,["x","y"])
     I = Ideal([x^2-1, y])
     sols = Vector{QQFieldElem}[
         [-1, 0],