added two test cases for issue #100

test_thread_msg_block_w_queue:
	demonstrates the behaviour described in issue #100
	and that it is solved by PR #569

test_thread_msg_block_wo_queue:
	demonstrates behaviour similar to the above but without
	a messge queue. This works with the current master, but
	breaks with PR #569

tests/test_thread_msg_block_w_queue/Makefile

@@ -0,0 +1,9 @@
+# name of your project
+export PROJECT = test_thread_msg_block_w_queue
+
+export BOARD ?= native
+
+# the absolute path of the RIOT-base dir
+export RIOTBASE =$(CURDIR)/../..
+
+include $(RIOTBASE)/Makefile.include

tests/test_thread_msg_block_w_queue/main.c

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief Thread test application
+ *
+ * @author Christian Mehlis <mehlis@inf.fu-berlin.de>
+ * @author Lotte Steenbrink <lotte.steenbrink@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "thread.h"
+#include "msg.h"
+
+char t1_stack[KERNEL_CONF_STACKSIZE_PRINTF];
+
+uint16_t p1, p_main;
+
+void thread1(void)
+{
+    printf("THREAD %u start\n", p1);
+
+    msg_t msg, reply;
+    memset(&msg, 1, sizeof(msg_t));
+
+    /* step 1: send asynchonously */
+    msg_send(&msg, p_main, 0);
+
+    /* step 2: send message, turning its status into STATUS_REPLY_BLOCKED */
+    msg_send_receive(&msg, &reply, p_main);
+    printf("received: %u, %u \n", reply.sender_pid, reply.type);
+    printf("pointer: %s\n", reply.content.ptr);
+
+    printf("THREAD %u SHOULD BE BLOCKING :(\n", p1);
+}
+
+int main(void)
+{
+    msg_t msg;
+    p_main = thread_pid;
+
+    msg_t msg_q[1];
+    msg_init_queue(msg_q, 1);
+
+    p1 = thread_create(t1_stack, KERNEL_CONF_STACKSIZE_PRINTF, PRIORITY_MAIN - 1,
+                       CREATE_WOUT_YIELD | CREATE_STACKTEST, thread1, "nr1");
+
+    /* step 3: receive a msg */
+    msg_receive(&msg);
+
+    printf("MAIN THREAD %u ALIVE!\n", p_main);
+}

tests/test_thread_msg_block_wo_queue/Makefile

@@ -0,0 +1,9 @@
+# name of your project
+export PROJECT = test_thread_msg_block_wo_queue
+
+export BOARD ?= native
+
+# the absolute path of the RIOT-base dir
+export RIOTBASE =$(CURDIR)/../..
+
+include $(RIOTBASE)/Makefile.include

tests/test_thread_msg_block_wo_queue/main.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser General
+ * Public License. See the file LICENSE in the top level directory for more
+ * details.
+ */
+
+/**
+ * @ingroup tests
+ * @{
+ *
+ * @file
+ * @brief Thread test application
+ *
+ * @author Christian Mehlis <mehlis@inf.fu-berlin.de>
+ * @author Lotte Steenbrink <lotte.steenbrink@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "thread.h"
+#include "msg.h"
+
+char t1_stack[KERNEL_CONF_STACKSIZE_PRINTF];
+
+uint16_t p1, p_main;
+
+void thread1(void)
+{
+    printf("THREAD %u start\n", p1);
+
+    msg_t msg, reply;
+    memset(&msg, 1, sizeof(msg_t));
+
+    /* step 1: send asynchonously */
+    msg_send(&msg, p_main, 0);
+
+    /* step 2: send message, turning its status into STATUS_REPLY_BLOCKED */
+    msg_send_receive(&msg, &reply, p_main);
+    printf("received: %u, %u \n", reply.sender_pid, reply.type);
+    printf("pointer: %s\n", reply.content.ptr);
+
+    printf("THREAD %u SHOULD BE BLOCKING :(\n", p1);
+}
+
+int main(void)
+{
+    msg_t msg;
+    p_main = thread_pid;
+
+    p1 = thread_create(t1_stack, KERNEL_CONF_STACKSIZE_PRINTF, PRIORITY_MAIN - 1,
+                       CREATE_WOUT_YIELD | CREATE_STACKTEST, thread1, "nr1");
+
+    /* step 3: receive a msg */
+    msg_receive(&msg);
+
+    printf("MAIN THREAD %u ALIVE!\n", p_main);
+}