Tests: added tests with abstract UNIX sockets.

test/test_asgi_application_unix_abstract.py

@@ -0,0 +1,23 @@
+from packaging import version
+from unit.applications.lang.python import TestApplicationPython
+
+
+class TestASGIApplicationUnixAbstract(TestApplicationPython):
+    prerequisites = {
+        'modules': {
+            'python': lambda v: version.parse(v) >= version.parse('3.5')
+        },
+        'features': ['unix_abstract'],
+    }
+    load_module = 'asgi'
+
+    def test_asgi_application_unix_abstract(self):
+        self.load('empty')
+
+        addr = '\0sock'
+        assert 'success' in self.conf(
+            {"unix:@" + addr[1:]: {"pass": "applications/empty"}},
+            'listeners',
+        )
+
+        assert self.get(sock_type='unix', addr=addr)['status'] == 200