add aliasing test

Author: Pangoraw

test/core/aliasing.jl

@@ -0,0 +1,42 @@
+using Reactant, Test
+
+function buffer_equals(x, y)
+    if x isa Reactant.ConcreteIFRTArray
+        y.data.buffer == x.data.buffer
+    elseif x isa Reactant.ConcretePJRTArray
+        y.data.buffers == x.data.buffers
+    else
+        error("invalid array type $(typeof(x))")
+    end
+end
+
+function copy_with_broadcast!(a, b)
+    a .= b
+    return nothing
+end
+
+mutable struct X{T}
+    x::T
+    y::T
+end
+
+function br_func!(x, z)
+    x.x .= z
+    x.y = x.x
+    return nothing
+end
+
+@testset "Buffer aliasing" begin
+    x = Reactant.to_rarray(ones(10))
+    y = similar(x)
+    @jit copy_with_broadcast!(y, x)
+    @test !buffer_equals(x, y)
+
+    x = Reactant.to_rarray(ones(10))
+    y = Reactant.to_rarray(ones(10))
+    x = X(x, y)
+    z = Reactant.to_rarray(ones(10))
+    @jit br_func!(x, z)
+    @test buffer_equals(x.x, x.y)
+    @test !buffer_equals(x.x, z)
+end