Add third_party/pexpect

third_party/pexpect/tests/test_async.py

+try:
+    import asyncio
+except ImportError:
+    asyncio = None
+
+import sys
+import unittest
+
+import pexpect
+from .PexpectTestCase import PexpectTestCase
+
+def run(coro):
+    return asyncio.get_event_loop().run_until_complete(coro)
+
+@unittest.skipIf(asyncio is None, "Requires asyncio")
+class AsyncTests(PexpectTestCase):
+    def test_simple_expect(self):
+        p = pexpect.spawn('cat')
+        p.sendline('Hello asyncio')
+        coro = p.expect(['Hello', pexpect.EOF] , async=True)
+        assert run(coro) == 0
+        print('Done')
+
+    def test_timeout(self):
+        p = pexpect.spawn('cat')
+        coro = p.expect('foo', timeout=1, async=True)
+        with self.assertRaises(pexpect.TIMEOUT):
+            run(coro)
+        
+        p = pexpect.spawn('cat')
+        coro = p.expect(['foo', pexpect.TIMEOUT], timeout=1, async=True)
+        assert run(coro) == 1
+
+    def test_eof(self):
+        p = pexpect.spawn('cat')
+        p.sendline('Hi')
+        coro = p.expect(pexpect.EOF, async=True)
+        p.sendeof()
+        assert run(coro) == 0
+
+        p = pexpect.spawn('cat')
+        p.sendeof()
+        coro = p.expect('Blah', async=True)
+        with self.assertRaises(pexpect.EOF):
+            run(coro)
+    
+    def test_expect_exact(self):
+        p = pexpect.spawn('%s list100.py' % sys.executable)
+        assert run(p.expect_exact(b'5', async=True)) == 0
+        assert run(p.expect_exact(['wpeok', b'11'], async=True)) == 1
+        assert run(p.expect_exact([b'foo', pexpect.EOF], async=True)) == 1