From c00f09f48252bc37c246ffcdd8536c30e80d741e Mon Sep 17 00:00:00 2001
From: Aayush Sabharwal <aayush.sabharwal@gmail.com>
Date: Thu, 9 Jan 2025 14:12:38 +0530
Subject: [PATCH] test: add tests for `fast_subsitute` on function of array of
 symbolics

---
 test/utils.jl | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/test/utils.jl b/test/utils.jl
index b47c1146a..8203b41f6 100644
--- a/test/utils.jl
+++ b/test/utils.jl
@@ -153,4 +153,12 @@ end
     test_nested_derivative = Dx(Dt(Dt(u)))
     result = diff2term(Symbolics.value(test_nested_derivative))
     @test typeof(result) === Symbolics.BasicSymbolic{Real}
-end
\ No newline at end of file
+end
+
+@testset "`fast_substitute` inside array symbolics" begin
+    @variables x y z
+    @register_symbolic foo(a::AbstractArray, b)
+    ex = foo([x, y], z)
+    ex2 = Symbolics.fixpoint_sub(ex, Dict(y => 1.0, z => 2.0))
+    @test isequal(ex2, foo([x, 1.0], 2.0))
+end