test: Move qtests to a separate directory

The tests directory itself is pretty overcrowded, and it's hard to
see which test belongs to which test subsystem (unit, qtest, ...).
Let's move the qtests to a separate folder for more clarity.

Message-Id: <20191218103059.11729-6-thuth@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/migration-helpers.c

@@ -0,0 +1,167 @@
+/*
+ * QTest migration helpers
+ *
+ * Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
+ *   based on the vhost-user-test.c that is:
+ *      Copyright (c) 2014 Virtual Open Systems Sarl.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/qmp/qjson.h"
+
+#include "migration-helpers.h"
+
+bool got_stop;
+
+static void stop_cb(void *opaque, const char *name, QDict *data)
+{
+    if (!strcmp(name, "STOP")) {
+        got_stop = true;
+    }
+}
+
+/*
+ * Events can get in the way of responses we are actually waiting for.
+ */
+QDict *wait_command_fd(QTestState *who, int fd, const char *command, ...)
+{
+    va_list ap;
+
+    va_start(ap, command);
+    qtest_qmp_vsend_fds(who, &fd, 1, command, ap);
+    va_end(ap);
+
+    return qtest_qmp_receive_success(who, stop_cb, NULL);
+}
+
+/*
+ * Events can get in the way of responses we are actually waiting for.
+ */
+QDict *wait_command(QTestState *who, const char *command, ...)
+{
+    va_list ap;
+
+    va_start(ap, command);
+    qtest_qmp_vsend(who, command, ap);
+    va_end(ap);
+
+    return qtest_qmp_receive_success(who, stop_cb, NULL);
+}
+
+/*
+ * Send QMP command "migrate".
+ * Arguments are built from @fmt... (formatted like
+ * qobject_from_jsonf_nofail()) with "uri": @uri spliced in.
+ */
+void migrate_qmp(QTestState *who, const char *uri, const char *fmt, ...)
+{
+    va_list ap;
+    QDict *args, *rsp;
+
+    va_start(ap, fmt);
+    args = qdict_from_vjsonf_nofail(fmt, ap);
+    va_end(ap);
+
+    g_assert(!qdict_haskey(args, "uri"));
+    qdict_put_str(args, "uri", uri);
+
+    rsp = qtest_qmp(who, "{ 'execute': 'migrate', 'arguments': %p}", args);
+
+    g_assert(qdict_haskey(rsp, "return"));
+    qobject_unref(rsp);
+}
+
+/*
+ * Note: caller is responsible to free the returned object via
+ * qobject_unref() after use
+ */
+QDict *migrate_query(QTestState *who)
+{
+    return wait_command(who, "{ 'execute': 'query-migrate' }");
+}
+
+/*
+ * Note: caller is responsible to free the returned object via
+ * g_free() after use
+ */
+static gchar *migrate_query_status(QTestState *who)
+{
+    QDict *rsp_return = migrate_query(who);
+    gchar *status = g_strdup(qdict_get_str(rsp_return, "status"));
+
+    g_assert(status);
+    qobject_unref(rsp_return);
+
+    return status;
+}
+
+static bool check_migration_status(QTestState *who, const char *goal,
+                                   const char **ungoals)
+{
+    bool ready;
+    char *current_status;
+    const char **ungoal;
+
+    current_status = migrate_query_status(who);
+    ready = strcmp(current_status, goal) == 0;
+    if (!ungoals) {
+        g_assert_cmpstr(current_status, !=, "failed");
+        /*
+         * If looking for a state other than completed,
+         * completion of migration would cause the test to
+         * hang.
+         */
+        if (strcmp(goal, "completed") != 0) {
+            g_assert_cmpstr(current_status, !=, "completed");
+        }
+    } else {
+        for (ungoal = ungoals; *ungoal; ungoal++) {
+            g_assert_cmpstr(current_status, !=,  *ungoal);
+        }
+    }
+    g_free(current_status);
+    return ready;
+}
+
+void wait_for_migration_status(QTestState *who,
+                               const char *goal, const char **ungoals)
+{
+    while (!check_migration_status(who, goal, ungoals)) {
+        usleep(1000);
+    }
+}
+
+void wait_for_migration_complete(QTestState *who)
+{
+    wait_for_migration_status(who, "completed", NULL);
+}
+
+void wait_for_migration_fail(QTestState *from, bool allow_active)
+{
+    QDict *rsp_return;
+    char *status;
+    bool failed;
+
+    do {
+        status = migrate_query_status(from);
+        bool result = !strcmp(status, "setup") || !strcmp(status, "failed") ||
+            (allow_active && !strcmp(status, "active"));
+        if (!result) {
+            fprintf(stderr, "%s: unexpected status status=%s allow_active=%d\n",
+                    __func__, status, allow_active);
+        }
+        g_assert(result);
+        failed = !strcmp(status, "failed");
+        g_free(status);
+    } while (!failed);
+
+    /* Is the machine currently running? */
+    rsp_return = wait_command(from, "{ 'execute': 'query-status' }");
+    g_assert(qdict_haskey(rsp_return, "running"));
+    g_assert(qdict_get_bool(rsp_return, "running"));
+    qobject_unref(rsp_return);
+}