Add tests

Author: phipsgabler

test/test_setindex.jl

@@ -23,6 +23,9 @@ end
     @test @set(arr[1] = 10) == [10, 2, 3]
     @test arr == [1,2,3]
     @test Setfield.setindex(arr, 10.0, 1) ==ₜ Float64[10.0, 2.0, 3.0]
+    @test Setfield.setindex(ones(2, 2), zeros(2), 1, :) ==ₜ Float64[0.0 0.0; 1.0 1.0]
+    @test Setfield.setindex(ones(BigInt, 2, 2), zeros(Float32, 2), 1, :) ==ₜ BigFloat[0.0 0.0; 1.0 1.0]
+    @test Setfield.setindex(fill(ones(1), 2, 2), [im, im], :, 1) ==ₜ Any[[im, im];; [[1.0], [1.0]]]
 
     d = Dict(:a => 1, :b => 2)
     @test_throws MethodError Base.setindex(d, 10, :a)