Test lazy_connect

The test makes sure the various corner cases are covered by the test
suite.

maxscale-system-test/mxs2350_lazy_connect.cpp

@@ -0,0 +1,39 @@
+/**
+ * MXS-2350: On-demand connection creation
+ * https://jira.mariadb.org/browse/MXS-2350
+ */
+
+#include "testconnections.h"
+#include <maxbase/string.hh>
+
+int main(int argc, char* argv[])
+{
+    TestConnections test(argc, argv);
+    Connection c = test.maxscales->rwsplit();
+
+    test.expect(c.connect(), "Connection should work");
+    auto output = test.maxscales->ssh_output("maxctrl list servers --tsv|cut -f 4|sort|uniq").second;
+    mxb::trim(output);
+    test.expect(output == "0", "Servers should have no connections: %s", output.c_str());
+    c.disconnect();
+
+    test.expect(c.connect(), "Connection should work");
+    test.expect(c.query("SELECT 1"), "Read should work");
+    c.disconnect();
+
+    test.expect(c.connect(), "Connection should work");
+    test.expect(c.query("SELECT @@last_insert_id"), "Write should work");
+    c.disconnect();
+
+    test.expect(c.connect(), "Connection should work");
+    test.expect(c.query("SET @a = 1"), "Session command should work");
+    c.disconnect();
+
+    test.expect(c.connect(), "Connection should work");
+    test.expect(c.query("BEGIN"), "BEGIN should work");
+    test.expect(c.query("SELECT 1"), "Read should work");
+    test.expect(c.query("COMMIT"), "COMMIT command should work");
+    c.disconnect();
+
+    return test.global_result;
+}