Add testing of bad client behavior

This test will become a suite over coming weeks.
Spin up a server, and send some illegal data to it, and probe that the correct behavior occurs.
diff --git a/test/core/bad_client/bad_client.c b/test/core/bad_client/bad_client.c
new file mode 100644
index 0000000..e6239bb
--- /dev/null
+++ b/test/core/bad_client/bad_client.c
@@ -0,0 +1,133 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "test/core/bad_client/bad_client.h"
+
+#include "src/core/channel/channel_stack.h"
+#include "src/core/channel/http_server_filter.h"
+#include "src/core/iomgr/endpoint_pair.h"
+#include "src/core/surface/completion_queue.h"
+#include "src/core/surface/server.h"
+#include "src/core/transport/chttp2_transport.h"
+
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+
+typedef struct {
+	grpc_server *server;
+	grpc_completion_queue *cq;
+	grpc_bad_client_server_side_validator validator;
+	gpr_event done_thd;
+	gpr_event done_write;
+} thd_args;
+
+static void thd_func(void *arg) {
+	thd_args *a = arg;
+	a->validator(a->server, a->cq);
+	gpr_event_set(&a->done_thd, (void*)1);
+}
+
+static void done_write(void *arg, grpc_endpoint_cb_status status) {
+	thd_args *a = arg;
+	gpr_event_set(&a->done_write, (void*)1);
+}
+
+static grpc_transport_setup_result server_setup_transport(void *ts, grpc_transport *transport, grpc_mdctx *mdctx) {
+	thd_args *a = ts;
+  static grpc_channel_filter const *extra_filters[] = {
+      &grpc_http_server_filter};
+  return grpc_server_setup_transport(a->server, transport, extra_filters,
+                                     GPR_ARRAY_SIZE(extra_filters), mdctx);
+}
+
+void grpc_run_bad_client_test(const char *name, const char *client_payload,
+	                            size_t client_payload_length,
+	                            grpc_bad_client_server_side_validator validator
+	                            ) {
+	grpc_endpoint_pair sfd;
+	thd_args a;
+	gpr_thd_id id;
+	gpr_slice slice = gpr_slice_from_copied_buffer(client_payload, client_payload_length);
+
+	/* Add a debug log */
+	gpr_log(GPR_INFO, "TEST: %s", name);
+
+	/* Init grpc */
+	grpc_init();
+
+	/* Create endpoints */
+	sfd = grpc_iomgr_create_endpoint_pair(65536);
+
+  /* Create server, completion events */
+	a.server = grpc_server_create_from_filters(NULL, 0, NULL);
+	a.cq = grpc_completion_queue_create();
+	gpr_event_init(&a.done_thd);
+	gpr_event_init(&a.done_write);
+	a.validator = validator;
+	grpc_server_register_completion_queue(a.server, a.cq);
+	grpc_server_start(a.server);
+	grpc_create_chttp2_transport(server_setup_transport, &a, NULL, sfd.server, NULL, 0, grpc_mdctx_create(), 0);
+
+  /* Bind everything into the same pollset */
+	grpc_endpoint_add_to_pollset(sfd.client, grpc_cq_pollset(a.cq));
+	grpc_endpoint_add_to_pollset(sfd.server, grpc_cq_pollset(a.cq));
+
+	/* Check a ground truth */
+	GPR_ASSERT(grpc_server_has_open_connections(a.server));
+
+	/* Start validator */
+	gpr_thd_new(&id, thd_func, &a, NULL);
+
+	/* Write data */
+	switch (grpc_endpoint_write(sfd.client, &slice, 1, done_write, &a)) {
+		case GRPC_ENDPOINT_WRITE_DONE:
+			done_write(&a, 1);
+			break;
+		case GRPC_ENDPOINT_WRITE_PENDING:
+			break;
+		case GRPC_ENDPOINT_WRITE_ERROR:
+			done_write(&a, 0);
+			break;
+	}
+
+	/* Await completion */
+	GPR_ASSERT(gpr_event_wait(&a.done_write, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5)));
+	GPR_ASSERT(gpr_event_wait(&a.done_thd, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5)));
+
+	/* Shutdown */
+	grpc_endpoint_destroy(sfd.client);
+	grpc_server_destroy(a.server);
+	grpc_completion_queue_destroy(a.cq);
+
+	grpc_shutdown();
+}