Move tests from test_issues.cpp/py into appropriate files

tests/test_operator_overloading.py

@@ -1,5 +1,9 @@
+import pytest
+from pybind11_tests import ConstructorStats
+
+
 def test_operator_overloading():
-    from pybind11_tests import Vector2, Vector, ConstructorStats
+    from pybind11_tests.operators import Vector2, Vector
 
     v1 = Vector2(1, 2)
     v2 = Vector(3, -1)
@@ -51,3 +55,53 @@ def test_operator_overloading():
     assert cstats.move_constructions >= 10
     assert cstats.copy_assignments == 0
     assert cstats.move_assignments == 0
+
+
+def test_operators_notimplemented():
+    """#393: need to return NotSupported to ensure correct arithmetic operator behavior"""
+    from pybind11_tests.operators import C1, C2
+
+    c1, c2 = C1(), C2()
+    assert c1 + c1 == 11
+    assert c2 + c2 == 22
+    assert c2 + c1 == 21
+    assert c1 + c2 == 12
+
+
+def test_nested():
+    """#328: first member in a class can't be used in operators"""
+    from pybind11_tests.operators import NestA, NestB, NestC, get_NestA, get_NestB, get_NestC
+
+    a = NestA()
+    b = NestB()
+    c = NestC()
+
+    a += 10
+    assert get_NestA(a) == 13
+    b.a += 100
+    assert get_NestA(b.a) == 103
+    c.b.a += 1000
+    assert get_NestA(c.b.a) == 1003
+    b -= 1
+    assert get_NestB(b) == 3
+    c.b -= 3
+    assert get_NestB(c.b) == 1
+    c *= 7
+    assert get_NestC(c) == 35
+
+    abase = a.as_base()
+    assert abase.value == -2
+    a.as_base().value += 44
+    assert abase.value == 42
+    assert c.b.a.as_base().value == -2
+    c.b.a.as_base().value += 44
+    assert c.b.a.as_base().value == 42
+
+    del c
+    pytest.gc_collect()
+    del a  # Should't delete while abase is still alive
+    pytest.gc_collect()
+
+    assert abase.value == 42
+    del abase, b
+    pytest.gc_collect()