add test for issue #394

Author: Christopher Doris

pytest/test_all.py

@@ -1,2 +1,19 @@
 def test_import():
     import juliacall
+
+def test_issue_394():
+    "https://github.com/JuliaPy/PythonCall.jl/issues/394"
+    from juliacall import Main as jl
+    x = 3
+    f = lambda x: x+1
+    y = 5
+    jl.x = f
+    assert jl.x is x
+    jl.f = f
+    assert jl.f is f
+    jl.y = y
+    assert jl.y is y
+    assert jl.x is x
+    assert jl.f is f
+    assert jl.y is y
+    assert jl.seval("f(x)") == 4