tests: Move ports/esp32/resolve_on_connect.py to net_inet.

The main reason for moving this test is that it needs internet connection
to pass.  So putting it in `net_inet` makes sure it's alongside other tests
that need the internet.

Also, it's a general test that could eventually run on other ports, if/when
they support doing an address resolution as part of `socket.connect()`.

Signed-off-by: Damien George <damien@micropython.org>

tests/net_inet/resolve_on_connect.py

@@ -0,0 +1,58 @@
+# Test that the socket module performs DNS resolutions on bind and connect.
+# Currenty only the esp32 port does this, so the test is restricted to that port.
+
+import sys
+
+if sys.implementation.name == "micropython" and sys.platform != "esp32":
+    print("SKIP")
+    raise SystemExit
+
+import socket
+
+
+def test_bind_resolves_0_0_0_0():
+    s = socket.socket()
+    try:
+        s.bind(("0.0.0.0", 31245))
+        print("bind actually bound")
+        s.close()
+    except Exception as e:
+        print("bind raised", e)
+
+
+def test_bind_resolves_localhost():
+    s = socket.socket()
+    try:
+        s.bind(("localhost", 31245))
+        print("bind actually bound")
+        s.close()
+    except Exception as e:
+        print("bind raised", e)
+
+
+def test_connect_resolves():
+    s = socket.socket()
+    try:
+        s.connect(("micropython.org", 80))
+        print("connect actually connected")
+        s.close()
+    except Exception as e:
+        print("connect raised", e)
+
+
+def test_connect_non_existent():
+    s = socket.socket()
+    try:
+        s.connect(("nonexistent.example.com", 80))
+        print("connect actually connected")
+        s.close()
+    except OSError as e:
+        print("connect raised OSError")
+    except Exception as e:
+        print("connect raised", e)
+
+
+test_funs = [n for n in dir() if n.startswith("test_")]
+for f in sorted(test_funs):
+    print("--", f, end=": ")
+    eval(f + "()")