fixup! test: rename generate_custom_function testset to code_generation

Author: AayushSabharwal

test/code_generation.jl

@@ -9,7 +9,8 @@ using ModelingToolkit: t_nounits as t, D_nounits as D
     u0 = [1.0, 2.0, 3.0, 4.0]
     p = ModelingToolkit.MTKParameters(sys, [])
 
-    fn1 = generate_custom_function(sys, x + y[1] + p1 + p2[1] + p3 * t; expression = Val(false))
+    fn1 = generate_custom_function(
+        sys, x + y[1] + p1 + p2[1] + p3 * t; expression = Val(false))
     @test fn1(u0, p, 0.0) == 5.0
 
     fn2 = generate_custom_function(