test: switch the unit tests to something resembling a test suite

The tests have inadvertent dependencies on each other so let's avoid
those by changing to a system that returns a null-terminated list of
test functions and our test runner iterates over those and forks off one
process per function.

test/fixes.c

@@ -347,13 +347,15 @@ fixes_pointer_barrier_clamp_test(void)
     assert(cy == barrier.y1);
 }
 
-int
+const testfunc_t*
 fixes_test(void)
 {
+    static const testfunc_t testfuncs[] = {
+        fixes_pointer_barriers_test,
+        fixes_pointer_barrier_direction_test,
+        fixes_pointer_barrier_clamp_test,
+        NULL,
+    };
 
-    fixes_pointer_barriers_test();
-    fixes_pointer_barrier_direction_test();
-    fixes_pointer_barrier_clamp_test();
-
-    return 0;
+    return testfuncs;
 }

test/hashtabletest.c

@@ -24,7 +24,7 @@ print_int(void* ptr, void* v)
     printf("%d", *x);
 }
 
-static int
+static void
 test1(void)
 {
     HashTable h;
@@ -79,10 +79,10 @@ test1(void)
 
     ht_destroy(h);
 
-    return ok;
+    assert(ok);
 }
 
-static int
+static void
 test2(void)
 {
     HashTable h;
@@ -122,10 +122,10 @@ test2(void)
         printf("Test with empty keys FAILED\n");
     }
 
-    return ok;
+    assert(ok);
 }
 
-static int
+static void
 test3(void)
 {
     int ok = 1;
@@ -152,15 +152,17 @@ test3(void)
 
     ht_destroy(h);
 
-    return ok;
+    assert(ok);
 }
 
-int
+const testfunc_t*
 hashtabletest_test(void)
 {
-    int ok = test1();
-    ok = ok && test2();
-    ok = ok && test3();
-
-    return ok ? 0 : 1;
+    static const testfunc_t testfuncs[] = {
+        test1,
+        test2,
+        test3,
+        NULL,
+    };
+    return testfuncs;
 }

test/input.c

@@ -1926,28 +1926,31 @@ dix_enqueue_events(void)
     inputInfo.devices = NULL;
 }
 
-int
+const testfunc_t*
 input_test(void)
 {
-    dix_enqueue_events();
-    dix_double_fp_conversion();
-    dix_input_valuator_masks();
-    dix_input_valuator_masks_unaccel();
-    dix_input_attributes();
-    dix_init_valuators();
-    dix_event_to_core_conversion();
-    dix_event_to_xi1_conversion();
-    dix_check_grab_values();
-    xi2_struct_sizes();
-    dix_grab_matching();
-    dix_valuator_mode();
-    include_byte_padding_macros();
-    include_bit_test_macros();
-    xi_unregister_handlers();
-    dix_valuator_alloc();
-    dix_get_master();
-    input_option_test();
-    mieq_test();
+    static const testfunc_t testfuncs[] = {
+        dix_enqueue_events,
+        dix_double_fp_conversion,
+        dix_input_valuator_masks,
+        dix_input_valuator_masks_unaccel,
+        dix_input_attributes,
+        dix_init_valuators,
+        dix_event_to_core_conversion,
+        dix_event_to_xi1_conversion,
+        dix_check_grab_values,
+        xi2_struct_sizes,
+        dix_grab_matching,
+        dix_valuator_mode,
+        include_byte_padding_macros,
+        include_bit_test_macros,
+        xi_unregister_handlers,
+        dix_valuator_alloc,
+        dix_get_master,
+        input_option_test,
+        mieq_test,
+        NULL,
+    };
 
-    return 0;
+    return testfuncs;
 }

test/list.c

@@ -377,19 +377,21 @@ test_nt_list_delete(void)
     free(list);
 }
 
-int
+const testfunc_t*
 list_test(void)
 {
-    test_xorg_list_init();
-    test_xorg_list_add();
-    test_xorg_list_append();
-    test_xorg_list_del();
-    test_xorg_list_for_each();
+    static const testfunc_t testfuncs[] = {
+        test_xorg_list_init,
+        test_xorg_list_add,
+        test_xorg_list_append,
+        test_xorg_list_del,
+        test_xorg_list_for_each,
 
-    test_nt_list_init();
-    test_nt_list_append();
-    test_nt_list_insert();
-    test_nt_list_delete();
-
-    return 0;
+        test_nt_list_init,
+        test_nt_list_append,
+        test_nt_list_insert,
+        test_nt_list_delete,
+        NULL,
+    };
+    return testfuncs;
 }

test/misc.c

@@ -223,13 +223,17 @@ bswap_test(void)
     assert(result_64 == expect_64);
 }
 
-int
+const testfunc_t*
 misc_test(void)
 {
-    dix_version_compare();
-    dix_update_desktop_dimensions();
-    dix_request_size_checks();
-    bswap_test();
+    static const testfunc_t testfuncs[] = {
+        dix_version_compare,
+        dix_update_desktop_dimensions,
+        dix_request_size_checks,
+        bswap_test,
+        NULL,
+    };
+    return testfuncs;
 
     return 0;
 }

test/signal-logging.c

@@ -402,11 +402,13 @@ static void logging_format(void)
 }
 #pragma GCC diagnostic pop /* "-Wformat-security" */
 
-int
+const testfunc_t*
 signal_logging_test(void)
 {
-    number_formatting();
-    logging_format();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        number_formatting,
+        logging_format,
+        NULL,
+    };
+    return testfuncs;
 }

test/string.c

@@ -65,10 +65,13 @@ strndup_checks(void)
     free(allofit);
 }
 
-int
+const testfunc_t*
 string_test(void)
 {
-    strndup_checks();
+    static const testfunc_t testfuncs[] = {
+        strndup_checks,
+        NULL,
+    };
 
-    return 0;
+    return testfuncs;
 }

test/test_xkb.c

@@ -175,12 +175,14 @@ xkb_set_get_rules_test(void)
     XkbFreeRMLVOSet(&rmlvo_backup, FALSE);
 }
 
-int
+const testfunc_t*
 xkb_test(void)
 {
-    xkb_set_get_rules_test();
-    xkb_get_rules_test();
-    xkb_set_rules_test();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        xkb_set_get_rules_test,
+        xkb_get_rules_test,
+        xkb_set_rules_test,
+        NULL,
+    };
+    return testfuncs;
 }

test/tests-common.c

@@ -7,27 +7,34 @@
 #include "tests-common.h"
 
 void
-run_test_in_child(int (*func)(void), const char *funcname)
+run_test_in_child(const testfunc_t* (*suite)(void), const char *funcname)
 {
     int cpid;
     int csts;
     int exit_code = -1;
+    const testfunc_t *func = suite();
 
     printf("\n---------------------\n%s...\n", funcname);
-    cpid = fork();
-    if (cpid) {
-        waitpid(cpid, &csts, 0);
-        if (!WIFEXITED(csts))
-            goto child_failed;
-        exit_code = WEXITSTATUS(csts);
-        if (exit_code == 0)
-            printf(" Pass\n");
-        else {
-child_failed:
-            printf(" FAIL\n");
-            exit(exit_code);
+
+    while (*func)
+    {
+        cpid = fork();
+        if (cpid) {
+            waitpid(cpid, &csts, 0);
+            if (!WIFEXITED(csts))
+                goto child_failed;
+            exit_code = WEXITSTATUS(csts);
+            if (exit_code != 0) {
+    child_failed:
+                printf(" FAIL\n");
+                exit(exit_code);
+            }
+        } else {
+            testfunc_t f = *func;
+            f();
+            exit(0);
         }
-    } else {
-        exit(func());
+        func++;
     }
+    printf(" Pass\n");
 }

test/tests-common.h

@@ -3,10 +3,11 @@
 
 #include "tests.h"
 
+
 #define ARRAY_SIZE(a)  (sizeof((a)) / sizeof((a)[0]))
 
 #define run_test(func) run_test_in_child(func, #func)
 
-void run_test_in_child(int (*func)(void), const char *funcname);
+void run_test_in_child(const testfunc_t* (*func)(void), const char *funcname);
 
 #endif /* TESTS_COMMON_H */

test/tests.h

@@ -1,31 +1,31 @@
 #ifndef TESTS_H
 #define TESTS_H
 
-int fixes_test(void);
-int hashtabletest_test(void);
-int input_test(void);
-int list_test(void);
-int misc_test(void);
-int signal_logging_test(void);
-int string_test(void);
-int touch_test(void);
-int xfree86_test(void);
-int xkb_test(void);
-int xtest_test(void);
+typedef void (*testfunc_t)(void);
 
-int protocol_xchangedevicecontrol_test(void);
-
-int protocol_xiqueryversion_test(void);
-int protocol_xiquerydevice_test(void);
-int protocol_xiselectevents_test(void);
-int protocol_xigetselectedevents_test(void);
-int protocol_xisetclientpointer_test(void);
-int protocol_xigetclientpointer_test(void);
-int protocol_xipassivegrabdevice_test(void);
-int protocol_xiquerypointer_test(void);
-int protocol_xiwarppointer_test(void);
-int protocol_eventconvert_test(void);
-int xi2_test(void);
+const testfunc_t* fixes_test(void);
+const testfunc_t* hashtabletest_test(void);
+const testfunc_t* input_test(void);
+const testfunc_t* list_test(void);
+const testfunc_t* misc_test(void);
+const testfunc_t* signal_logging_test(void);
+const testfunc_t* string_test(void);
+const testfunc_t* touch_test(void);
+const testfunc_t* xfree86_test(void);
+const testfunc_t* xkb_test(void);
+const testfunc_t* xtest_test(void);
+const testfunc_t* protocol_xchangedevicecontrol_test(void);
+const testfunc_t* protocol_xiqueryversion_test(void);
+const testfunc_t* protocol_xiquerydevice_test(void);
+const testfunc_t* protocol_xiselectevents_test(void);
+const testfunc_t* protocol_xigetselectedevents_test(void);
+const testfunc_t* protocol_xisetclientpointer_test(void);
+const testfunc_t* protocol_xigetclientpointer_test(void);
+const testfunc_t* protocol_xipassivegrabdevice_test(void);
+const testfunc_t* protocol_xiquerypointer_test(void);
+const testfunc_t* protocol_xiwarppointer_test(void);
+const testfunc_t* protocol_eventconvert_test(void);
+const testfunc_t* xi2_test(void);
 
 #ifndef INSIDE_PROTOCOL_COMMON
 

test/touch.c

@@ -306,16 +306,16 @@ touch_init(void)
     free_device(&dev);
 }
 
-int
+const testfunc_t*
 touch_test(void)
 {
-    printf("touch_test: start...\n");
-    touch_grow_queue();
-    touch_find_ddxid();
-    touch_begin_ddxtouch();
-    touch_init();
-    touch_begin_touch();
-
-    printf("touch_test: exiting successfully\n");
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        touch_grow_queue,
+        touch_find_ddxid,
+        touch_begin_ddxtouch,
+        touch_init,
+        touch_begin_touch,
+        NULL,
+    };
+    return testfuncs;
 }

test/xfree86.c

@@ -108,11 +108,13 @@ xfree86_add_comment(void)
     free(current);
 }
 
-int
+const testfunc_t*
 xfree86_test(void)
 {
-    xfree86_option_list_duplicate();
-    xfree86_add_comment();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        xfree86_option_list_duplicate,
+        xfree86_add_comment,
+        NULL,
+    };
+    return testfuncs;
 }

test/xi1/protocol-xchangedevicecontrol.c

@@ -85,6 +85,8 @@ static unsigned char *data[4096];       /* the request buffer */
 static void
 test_ChangeDeviceControl(void)
 {
+    init_simple();
+
     xChangeDeviceControlReq *request = (xChangeDeviceControlReq *) data;
     xDeviceCtl *control = (xDeviceCtl *) (&request[1]);
 
@@ -115,12 +117,12 @@ test_ChangeDeviceControl(void)
     /* XXX: Test functionality! */
 }
 
-int
+const testfunc_t*
 protocol_xchangedevicecontrol_test(void)
 {
-    init_simple();
-
-    test_ChangeDeviceControl();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        test_ChangeDeviceControl,
+        NULL,
+    };
+    return testfuncs;
 }

test/xi2/protocol-eventconvert.c

@@ -1206,15 +1206,17 @@ test_convert_XIBarrierEvent(void)
     test_XIBarrierEvent(&in);
 }
 
-int
+const testfunc_t*
 protocol_eventconvert_test(void)
 {
-    test_convert_XIRawEvent();
-    test_convert_XIFocusEvent();
-    test_convert_XIDeviceEvent();
-    test_convert_XIDeviceChangedEvent();
-    test_convert_XITouchOwnershipEvent();
-    test_convert_XIBarrierEvent();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        test_convert_XIRawEvent,
+        test_convert_XIFocusEvent,
+        test_convert_XIDeviceEvent,
+        test_convert_XIDeviceChangedEvent,
+        test_convert_XITouchOwnershipEvent,
+        test_convert_XIBarrierEvent,
+        NULL,
+    };
+    return testfuncs;
 }

test/xi2/protocol-xigetclientpointer.c

@@ -100,6 +100,9 @@ test_XIGetClientPointer(void)
 {
     xXIGetClientPointerReq request;
 
+    init_simple();
+    client_window = init_client(0, NULL);
+
     request_init(&request, XIGetClientPointer);
 
     request.win = CLIENT_WINDOW_ID;
@@ -144,13 +147,13 @@ test_XIGetClientPointer(void)
     request_XIGetClientPointer(&client_request, &request, Success);
 }
 
-int
+const testfunc_t*
 protocol_xigetclientpointer_test(void)
 {
-    init_simple();
-    client_window = init_client(0, NULL);
+    static const testfunc_t testfuncs[] = {
+        test_XIGetClientPointer,
+        NULL,
+    };
 
-    test_XIGetClientPointer();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xigetselectedevents.c

@@ -145,10 +145,15 @@ test_XIGetSelectedEvents(void)
 {
     int i, j;
     xXIGetSelectedEventsReq request;
-    ClientRec client = init_client(0, NULL);
+    ClientRec client;
     unsigned char *mask;
     DeviceIntRec dev;
 
+    init_simple();
+    enable_GrabButton_wrap = 0;
+    enable_XISetEventMask_wrap = 0;
+    client = init_client(0, NULL);
+
     request_init(&request, XIGetSelectedEvents);
 
     printf("Testing for BadWindow on invalid window.\n");
@@ -208,14 +213,14 @@ test_XIGetSelectedEvents(void)
     }
 }
 
-int
+const testfunc_t*
 protocol_xigetselectedevents_test(void)
 {
-    init_simple();
-    enable_GrabButton_wrap = 0;
-    enable_XISetEventMask_wrap = 0;
-
-    test_XIGetSelectedEvents();
+    static const testfunc_t testfuncs[] = {
+        test_XIGetSelectedEvents,
+        NULL,
+    };
+    return testfuncs;
 
     return 0;
 }

test/xi2/protocol-xipassivegrabdevice.c

@@ -175,6 +175,8 @@ test_XIPassiveGrabDevice(void)
     xXIPassiveGrabDeviceReq *request = (xXIPassiveGrabDeviceReq *) data;
     unsigned char *mask;
 
+    init_simple();
+
     request_init(request, XIPassiveGrabDevice);
 
     request->grab_window = CLIENT_WINDOW_ID;
@@ -247,12 +249,13 @@ test_XIPassiveGrabDevice(void)
     request_XIPassiveGrabDevice(&client_request, request, Success, 0);
 }
 
-int
+const testfunc_t*
 protocol_xipassivegrabdevice_test(void)
 {
-    init_simple();
+    static const testfunc_t testfuncs[] = {
+        test_XIPassiveGrabDevice,
+        NULL,
+    };
 
-    test_XIPassiveGrabDevice();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xiquerydevice.c

@@ -317,6 +317,8 @@ test_XIQueryDevice(void)
     xXIQueryDeviceReq request;
     struct test_data data;
 
+    init_simple();
+
     reply_handler = reply_XIQueryDevice;
     global_userdata = &data;
     request_init(&request, XIQueryDevice);
@@ -338,12 +340,13 @@ test_XIQueryDevice(void)
 
 }
 
-int
+const testfunc_t*
 protocol_xiquerydevice_test(void)
 {
-    init_simple();
+    static const testfunc_t testfuncs[] = {
+        test_XIQueryDevice,
+        NULL,
+    };
 
-    test_XIQueryDevice();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xiquerypointer.c

@@ -139,6 +139,8 @@ test_XIQueryPointer(void)
     int i;
     xXIQueryPointerReq request;
 
+    init_simple();
+
     memset(&request, 0, sizeof(request));
 
     request_init(&request, XIQueryPointer);
@@ -192,12 +194,12 @@ test_XIQueryPointer(void)
     request_XIQueryPointer(&client_request, &request, BadLength);
 }
 
-int
+const testfunc_t*
 protocol_xiquerypointer_test(void)
 {
-    init_simple();
-
-    test_XIQueryPointer();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        test_XIQueryPointer,
+        NULL,
+    };
+    return testfuncs;
 }

test/xi2/protocol-xiqueryversion.c

@@ -151,6 +151,8 @@ request_XIQueryVersion(int smaj, int smin, int cmaj, int cmin, int error)
 static void
 test_XIQueryVersion(void)
 {
+    init_simple();
+
     reply_handler = reply_XIQueryVersion;
 
     printf("Server version 2.0 - client versions [1..3].0\n");
@@ -203,6 +205,8 @@ test_XIQueryVersion_multiple(void)
     struct test_data versions;
     int rc;
 
+    init_simple();
+
     request_init(&request, XIQueryVersion);
     client = init_client(request.length, &request);
 
@@ -290,13 +294,14 @@ test_XIQueryVersion_multiple(void)
     assert(rc == BadValue);
 }
 
-int
+const testfunc_t*
 protocol_xiqueryversion_test(void)
 {
-    init_simple();
+    static const testfunc_t testfuncs[] = {
+        test_XIQueryVersion,
+        test_XIQueryVersion_multiple,
+        NULL,
+    };
 
-    test_XIQueryVersion();
-    test_XIQueryVersion_multiple();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xiselectevents.c

@@ -288,6 +288,8 @@ test_XISelectEvents(void)
     xXIEventMask *mask;
     xXISelectEventsReq *req;
 
+    init_simple();
+
     req = (xXISelectEventsReq *) data;
 
     request_init(req, XISelectEvents);
@@ -364,12 +366,13 @@ test_XISelectEvents(void)
     request_XISelectEvents_masks(req);
 }
 
-int
+const testfunc_t*
 protocol_xiselectevents_test(void)
 {
-    init_simple();
+    static const testfunc_t testfuncs[] = {
+        test_XISelectEvents,
+        NULL,
+    };
 
-    test_XISelectEvents();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xisetclientpointer.c

@@ -85,6 +85,9 @@ test_XISetClientPointer(void)
     int i;
     xXISetClientPointerReq request;
 
+    init_simple();
+    client_window = init_client(0, NULL);
+
     request_init(&request, XISetClientPointer);
 
     request.win = CLIENT_WINDOW_ID;
@@ -124,13 +127,13 @@ test_XISetClientPointer(void)
 
 }
 
-int
+const testfunc_t*
 protocol_xisetclientpointer_test(void)
 {
-    init_simple();
-    client_window = init_client(0, NULL);
+    static const testfunc_t testfuncs[] = {
+        test_XISetClientPointer,
+        NULL,
+    };
 
-    test_XISetClientPointer();
-
-    return 0;
+    return testfuncs;
 }

test/xi2/protocol-xiwarppointer.c

@@ -106,6 +106,9 @@ test_XIWarpPointer(void)
     ClientRec client_request;
     xXIWarpPointerReq request;
 
+    init_simple();
+    screen.SetCursorPosition = ScreenSetCursorPosition;
+
     memset(&request, 0, sizeof(request));
 
     request_init(&request, XIWarpPointer);
@@ -188,13 +191,12 @@ test_XIWarpPointer(void)
     request_XIWarpPointer(&client_request, &request, BadLength);
 }
 
-int
+const testfunc_t*
 protocol_xiwarppointer_test(void)
 {
-    init_simple();
-    screen.SetCursorPosition = ScreenSetCursorPosition;
-
-    test_XIWarpPointer();
-
-    return 0;
+    static const testfunc_t testfuncs[] = {
+        test_XIWarpPointer,
+        NULL,
+    };
+    return testfuncs;
 }

test/xi2/xi2.c

@@ -139,10 +139,14 @@ xi2mask_test(void)
     free(mask);
 }
 
-int
+const testfunc_t*
 xi2_test(void)
 {
-    xi2mask_test();
+    static const testfunc_t testfuncs[] = {
+        xi2mask_test,
+        NULL,
+    };
+    return testfuncs;
 
     return 0;
 }

test/xtest.c

@@ -60,57 +60,12 @@ device_cursor_cleanup(DeviceIntPtr dev, ScreenPtr screen)
 }
 
 static void
-xtest_init_devices(void)
+xtest_init(void)
 {
-    assert(xtestpointer);
-    assert(xtestkeyboard);
-    assert(IsXTestDevice(xtestpointer, NULL));
-    assert(IsXTestDevice(xtestkeyboard, NULL));
-    assert(IsXTestDevice(xtestpointer, inputInfo.pointer));
-
-    assert(IsXTestDevice(xtestkeyboard, inputInfo.keyboard));
-    assert(GetXTestDevice(inputInfo.pointer) == xtestpointer);
-
-    assert(GetXTestDevice(inputInfo.keyboard) == xtestkeyboard);
-}
-
-/**
- * Each xtest devices has a property attached marking it. This property
- * cannot be changed.
- */
-static void
-xtest_properties(void)
-{
-    int rc;
-    char value = 1;
-    XIPropertyValuePtr prop;
-    Atom xtest_prop = XIGetKnownProperty(XI_PROP_XTEST_DEVICE);
-
-    rc = XIGetDeviceProperty(xtestpointer, xtest_prop, &prop);
-    assert(rc == Success);
-    assert(prop);
-
-    rc = XIGetDeviceProperty(xtestkeyboard, xtest_prop, &prop);
-    assert(rc == Success);
-    assert(prop != NULL);
-
-    rc = XIChangeDeviceProperty(xtestpointer, xtest_prop,
-                                XA_INTEGER, 8, PropModeReplace, 1, &value,
-                                FALSE);
-    assert(rc == BadAccess);
-    rc = XIChangeDeviceProperty(xtestkeyboard, xtest_prop,
-                                XA_INTEGER, 8, PropModeReplace, 1, &value,
-                                FALSE);
-    assert(rc == BadAccess);
-}
-
-int
-xtest_test(void)
-{
-    ScreenRec screen = {0};
-    ClientRec server_client = {0};
-    WindowRec root = {{0}};
-    WindowOptRec optional = {0};
+    static ScreenRec screen = {0};
+    static ClientRec server_client = {0};
+    static WindowRec root = {{0}};
+    static WindowOptRec optional = {0};
 
     /* random stuff that needs initialization */
     root.drawable.id = 0xab;
@@ -134,11 +89,75 @@ xtest_test(void)
 
     /* this also inits the xtest devices */
     InitCoreDevices();
-
-    xtest_init_devices();
-    xtest_properties();
-
-    CloseDownDevices();
-
-    return 0;
+}
+
+static void
+xtest_cleanup(void)
+{
+    CloseDownDevices();
+}
+
+static void
+xtest_init_devices(void)
+{
+    xtest_init();
+
+    assert(xtestpointer);
+    assert(xtestkeyboard);
+    assert(IsXTestDevice(xtestpointer, NULL));
+    assert(IsXTestDevice(xtestkeyboard, NULL));
+    assert(IsXTestDevice(xtestpointer, inputInfo.pointer));
+
+    assert(IsXTestDevice(xtestkeyboard, inputInfo.keyboard));
+    assert(GetXTestDevice(inputInfo.pointer) == xtestpointer);
+
+    assert(GetXTestDevice(inputInfo.keyboard) == xtestkeyboard);
+
+    xtest_cleanup();
+}
+
+/**
+ * Each xtest devices has a property attached marking it. This property
+ * cannot be changed.
+ */
+static void
+xtest_properties(void)
+{
+    int rc;
+    char value = 1;
+    XIPropertyValuePtr prop;
+    Atom xtest_prop;
+
+    xtest_init();
+
+    xtest_prop = XIGetKnownProperty(XI_PROP_XTEST_DEVICE);
+    rc = XIGetDeviceProperty(xtestpointer, xtest_prop, &prop);
+    assert(rc == Success);
+    assert(prop);
+
+    rc = XIGetDeviceProperty(xtestkeyboard, xtest_prop, &prop);
+    assert(rc == Success);
+    assert(prop != NULL);
+
+    rc = XIChangeDeviceProperty(xtestpointer, xtest_prop,
+                                XA_INTEGER, 8, PropModeReplace, 1, &value,
+                                FALSE);
+    assert(rc == BadAccess);
+    rc = XIChangeDeviceProperty(xtestkeyboard, xtest_prop,
+                                XA_INTEGER, 8, PropModeReplace, 1, &value,
+                                FALSE);
+    assert(rc == BadAccess);
+
+    xtest_cleanup();
+}
+
+const testfunc_t*
+xtest_test(void)
+{
+    static const testfunc_t testfuncs[] = {
+        xtest_init_devices,
+        xtest_properties,
+        NULL,
+    };
+    return testfuncs;
 }