qmp-test: Drop dependence on global_qtest

As a general rule, we prefer avoiding implicit global state
because it makes code harder to safely copy and paste without
thinking about the global state.  Although qmp-test does not
maintain parallel qtest connections, it was the last test
assigning to global_qtest.  It's just as easy to be explicit
about the state; once all tests have been cleaned up, a later
patch can then get rid of global_qtest and a layer of wrappers
in libqtest.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qmp-test.c

@@ -43,32 +43,32 @@ static void test_version(QObject *version)
     visit_free(v);
 }
 
-static void test_malformed(void)
+static void test_malformed(QTestState *qts)
 {
     QDict *resp;
 
     /* Not even a dictionary */
-    resp = qmp("null");
+    resp = qtest_qmp(qts, "null");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     QDECREF(resp);
 
     /* No "execute" key */
-    resp = qmp("{}");
+    resp = qtest_qmp(qts, "{}");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     QDECREF(resp);
 
     /* "execute" isn't a string */
-    resp = qmp("{ 'execute': true }");
+    resp = qtest_qmp(qts, "{ 'execute': true }");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     QDECREF(resp);
 
     /* "arguments" isn't a dictionary */
-    resp = qmp("{ 'execute': 'no-such-cmd', 'arguments': [] }");
+    resp = qtest_qmp(qts, "{ 'execute': 'no-such-cmd', 'arguments': [] }");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     QDECREF(resp);
 
     /* extra key */
-    resp = qmp("{ 'execute': 'no-such-cmd', 'extra': true }");
+    resp = qtest_qmp(qts, "{ 'execute': 'no-such-cmd', 'extra': true }");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     QDECREF(resp);
 }
@@ -77,11 +77,12 @@ static void test_qmp_protocol(void)
 {
     QDict *resp, *q, *ret;
     QList *capabilities;
+    QTestState *qts;
 
-    global_qtest = qtest_init_without_qmp_handshake(common_args);
+    qts = qtest_init_without_qmp_handshake(common_args);
 
     /* Test greeting */
-    resp = qmp_receive();
+    resp = qtest_qmp_receive(qts);
     q = qdict_get_qdict(resp, "QMP");
     g_assert(q);
     test_version(qdict_get(q, "version"));
@@ -90,46 +91,46 @@ static void test_qmp_protocol(void)
     QDECREF(resp);
 
     /* Test valid command before handshake */
-    resp = qmp("{ 'execute': 'query-version' }");
+    resp = qtest_qmp(qts, "{ 'execute': 'query-version' }");
     g_assert_cmpstr(get_error_class(resp), ==, "CommandNotFound");
     QDECREF(resp);
 
     /* Test malformed commands before handshake */
-    test_malformed();
+    test_malformed(qts);
 
     /* Test handshake */
-    resp = qmp("{ 'execute': 'qmp_capabilities' }");
+    resp = qtest_qmp(qts, "{ 'execute': 'qmp_capabilities' }");
     ret = qdict_get_qdict(resp, "return");
     g_assert(ret && !qdict_size(ret));
     QDECREF(resp);
 
     /* Test repeated handshake */
-    resp = qmp("{ 'execute': 'qmp_capabilities' }");
+    resp = qtest_qmp(qts, "{ 'execute': 'qmp_capabilities' }");
     g_assert_cmpstr(get_error_class(resp), ==, "CommandNotFound");
     QDECREF(resp);
 
     /* Test valid command */
-    resp = qmp("{ 'execute': 'query-version' }");
+    resp = qtest_qmp(qts, "{ 'execute': 'query-version' }");
     test_version(qdict_get(resp, "return"));
     QDECREF(resp);
 
     /* Test malformed commands */
-    test_malformed();
+    test_malformed(qts);
 
     /* Test 'id' */
-    resp = qmp("{ 'execute': 'query-name', 'id': 'cookie#1' }");
+    resp = qtest_qmp(qts, "{ 'execute': 'query-name', 'id': 'cookie#1' }");
     ret = qdict_get_qdict(resp, "return");
     g_assert(ret);
     g_assert_cmpstr(qdict_get_try_str(resp, "id"), ==, "cookie#1");
     QDECREF(resp);
 
     /* Test command failure with 'id' */
-    resp = qmp("{ 'execute': 'human-monitor-command', 'id': 2 }");
+    resp = qtest_qmp(qts, "{ 'execute': 'human-monitor-command', 'id': 2 }");
     g_assert_cmpstr(get_error_class(resp), ==, "GenericError");
     g_assert_cmpint(qdict_get_int(resp, "id"), ==, 2);
     QDECREF(resp);
 
-    qtest_end();
+    qtest_quit(qts);
 }
 
 static int query_error_class(const char *cmd)