Fix broken test

Author: YingboMa

test/structural_transformation/tearing.jl

@@ -167,6 +167,7 @@ u = [1.0];
 pr = 0.2;
 tt = 0.1;
 @test_skip (@ballocated $(prob.f)($du, $u, $pr, $tt)) == 0
+prob.f(du, u, pr, tt)
 @test du≈[-asin(u[1] - pr * tt)] atol=1e-5
 
 # test the initial guess is respected