add a test

Author: shashi

test/polyform.jl

@@ -63,6 +63,9 @@ end
     ##404#issuecomment-939404030
     a = 1 / (x - (2//1)) + ((-5//1) - x) / ((x - (2//1))^2)
     @test isequal(simplify_fractions(a), -7/(x-2)^2)
+
+    # https://github.com/JuliaSymbolics/Symbolics.jl/issues/968
+    @eqtest simplify_fractions((x * y + (1//2) * x) / (2 * x)) == 1//4 * (1 + 2y)
 end
 
 @testset "isone iszero" begin