Add test for multi directional tuple

tests/test_coreir/gold/test_multi_direction_tuple.json

@@ -0,0 +1,16 @@
+{"top":"global.Foo",
+"namespaces":{
+  "global":{
+    "modules":{
+      "Foo":{
+        "type":["Record",[
+          ["ifc",["Record",[["I","BitIn"],["O","Bit"]]]]
+        ]],
+        "connections":[
+          ["self.ifc.O","self.ifc.I"]
+        ]
+      }
+    }
+  }
+}
+}

tests/test_coreir/test_coreir_tuple.py

@@ -0,0 +1,21 @@
+import magma as m
+from magma.testing import check_files_equal
+
+
+def test_multi_direction_tuple():
+    foo = m.DefineCircuit("Foo", "ifc", m.Tuple(I=m.In(m.Bit), O=m.Out(m.Bit)))
+    m.wire(foo.ifc.I, foo.ifc.O)
+    m.EndCircuit()
+
+    m.compile("build/test_multi_direction_tuple", foo, output="coreir")
+    assert check_files_equal(__file__, f"build/test_multi_direction_tuple.json",
+                             f"gold/test_multi_direction_tuple.json")
+
+    assert [T.isinput() for T in foo.interface.ports["ifc"].Ts] == \
+           [False, True]
+
+    assert [T.isinput() for T in foo.IO.ports["ifc"].Ts] == \
+           [True, False]
+
+if __name__ == "__main__":
+    test_multi_direction_tuple()