diff --git a/client/tests/CMakeLists.txt b/client/tests/CMakeLists.txt
index 0978037f..53523601 100644
--- a/client/tests/CMakeLists.txt
+++ b/client/tests/CMakeLists.txt
@@ -46,6 +46,43 @@ set_tests_properties(wayland-motion-tests PROPERTIES
   TIMEOUT 10
 )
 
+add_executable(mouse-tests
+  mouse_test.c
+  ../src/core.c
+  ../src/util.c
+)
+target_compile_definitions(mouse-tests PRIVATE
+  CIMGUI_DEFINE_ENUMS_AND_STRUCTS=1
+)
+target_include_directories(mouse-tests PRIVATE
+  "${CMAKE_CURRENT_SOURCE_DIR}/../src"
+  "${PROJECT_TOP}/repos/PureSpice/include"
+  "${PROJECT_TOP}/repos/gui/cimgui"
+  "${PROJECT_TOP}/repos/gui/cimgui/imgui"
+)
+target_link_libraries(mouse-tests
+  ${EXE_FLAGS}
+  lg_common
+)
+set(MOUSE_CASES
+  inset-exit
+  exit-delay
+  exit-guest
+  confine-pending
+  confine-guest
+  capture-pending
+  capture-revoked
+  capture-release
+)
+foreach(name IN LISTS MOUSE_CASES)
+  add_test(NAME mouse-${name}
+    COMMAND mouse-tests ${name}
+  )
+  set_tests_properties(mouse-${name} PROPERTIES
+    TIMEOUT 10
+  )
+endforeach()
+
 find_package(GTest REQUIRED)
 find_program(WESTON_EXECUTABLE NAMES weston)
 if(NOT WESTON_EXECUTABLE)
diff --git a/client/tests/mouse_test.c b/client/tests/mouse_test.c
new file mode 100644
index 00000000..8bb51da8
--- /dev/null
+++ b/client/tests/mouse_test.c
@@ -0,0 +1,443 @@
+/**
+ * Looking Glass
+ * Copyright © 2017-2026 The Looking Glass Authors
+ * https://looking-glass.io
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "app.h"
+#include "core.h"
+#include "main.h"
+#include "test.h"
+#include "util.h"
+
+#include <math.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <string.h>
+
+enum EvType
+{
+  EV_GRAB,
+  EV_UNGRAB,
+  EV_CAPTURE,
+  EV_UNCAPTURE,
+  EV_WARP,
+  EV_GUEST,
+  EV_MOTION,
+  EV_VALID,
+};
+
+struct Ev
+{
+  enum EvType type;
+  double      x;
+  double      y;
+  bool        exit;
+  bool        conf;
+  bool        lock;
+};
+
+struct Trap
+{
+  bool req;
+  bool on;
+  bool hold;
+};
+
+static struct
+{
+  enum LG_DSWarpSupport support;
+  struct Trap           conf;
+  struct Trap           lock;
+  bool                  valid;
+  struct Ev             ev[256];
+  unsigned int          count;
+}
+m;
+
+struct AppState    g_state;
+struct CursorState g_cursor;
+struct AppParams   g_params;
+
+static void push(enum EvType type, double x, double y, bool leaving)
+{
+  CHECK(m.count < sizeof(m.ev) / sizeof(m.ev[0]));
+  m.ev[m.count++] = (struct Ev) {
+    .type = type,
+    .x    = x,
+    .y    = y,
+    .exit = leaving,
+    .conf = m.conf.on,
+    .lock = m.lock.on,
+  };
+}
+
+static unsigned int count(enum EvType type)
+{
+  unsigned int result = 0;
+  for (unsigned int i = 0; i < m.count; ++i)
+    if (m.ev[i].type == type)
+      ++result;
+  return result;
+}
+
+static int first(enum EvType type)
+{
+  for (unsigned int i = 0; i < m.count; ++i)
+    if (m.ev[i].type == type)
+      return i;
+  return -1;
+}
+
+static void guest(double x, double y, double localX, double localY)
+{
+  (void)x;
+  (void)y;
+  push(EV_GUEST, localX, localY, false);
+}
+
+static void setPointer(LG_DSPointer pointer)
+{
+  (void)pointer;
+}
+
+static void keyNoop(void)
+{
+}
+
+static void grab(void)
+{
+  m.conf.req = true;
+  push(EV_GRAB, 0, 0, false);
+}
+
+static void ungrab(void)
+{
+  push(EV_UNGRAB, 0, 0, false);
+  m.conf.req = false;
+  if (!m.conf.hold)
+    m.conf.on = false;
+}
+
+static void capture(void)
+{
+  m.conf.req = false;
+  if (!m.conf.hold)
+    m.conf.on = false;
+  m.lock.req = true;
+  push(EV_CAPTURE, 0, 0, false);
+}
+
+static void uncapture(void)
+{
+  push(EV_UNCAPTURE, 0, 0, false);
+  m.lock.req = false;
+  if (!m.lock.hold)
+    m.lock.on = false;
+}
+
+static void warp(int x, int y, bool exiting)
+{
+  push(EV_WARP, x, y, exiting);
+}
+
+static bool valid(int x, int y)
+{
+  push(EV_VALID, x, y, false);
+  return m.valid;
+}
+
+static struct LG_DisplayServerOps ds = {
+  .name                = "test",
+  .guestPointerUpdated = guest,
+  .setPointer          = setPointer,
+  .grabKeyboard        = keyNoop,
+  .ungrabKeyboard      = keyNoop,
+  .grabPointer         = grab,
+  .ungrabPointer       = ungrab,
+  .capturePointer      = capture,
+  .uncapturePointer    = uncapture,
+  .warpPointer         = warp,
+  .isValidPointerPos   = valid,
+};
+
+bool app_getProp(LG_DSProperty prop, void * ret)
+{
+  if (prop != LG_DS_WARP_SUPPORT)
+    return false;
+
+  *(enum LG_DSWarpSupport *)ret = m.support;
+  return true;
+}
+
+bool app_guestIsWindows(void)
+{
+  return false;
+}
+
+bool app_isOverlayMode(void)
+{
+  return false;
+}
+
+bool app_isRunning(void)
+{
+  return false;
+}
+
+uint64_t app_mouseSeq(void)
+{
+  return 0;
+}
+
+void app_mouseTrace(const char * file, unsigned int line,
+    const char * function, uint64_t seq, const char * format, ...)
+{
+  (void)file;
+  (void)line;
+  (void)function;
+  (void)seq;
+  (void)format;
+}
+
+bool purespice_mouseMotion(int32_t x, int32_t y)
+{
+  push(EV_MOTION, x, y, false);
+  return true;
+}
+
+static void reset(void)
+{
+  memset(&m, 0, sizeof(m));
+  memset(&g_state, 0, sizeof(g_state));
+  memset(&g_cursor, 0, sizeof(g_cursor));
+  memset(&g_params, 0, sizeof(g_params));
+
+  m.support = LG_DS_WARP_SURFACE;
+  m.valid   = true;
+
+  g_state.ds           = &ds;
+  g_state.focused      = true;
+  g_state.haveSrcSize  = true;
+  g_state.posInfoValid = true;
+  g_state.formatValid  = true;
+  g_state.windowW      = 300;
+  g_state.windowH      = 200;
+  g_state.srcSize      = (struct Point) { 100, 80 };
+  g_state.dstRect      = (LG_RendererRect) {
+    .valid = true,
+    .x     = 10,
+    .y     = 20,
+    .w     = 100,
+    .h     = 80,
+  };
+
+  g_params.useSpiceInput     = true;
+  g_params.scaleMouseInput   = true;
+
+  g_cursor.inWindow    = true;
+  g_cursor.inView      = true;
+  g_cursor.warpState   = WARP_STATE_ON;
+  g_cursor.guest.valid = true;
+  g_cursor.scale       = (struct DoublePoint) { 1.0, 1.0 };
+}
+
+static void setLocal(double x, double y)
+{
+  g_cursor.pos = (struct DoublePoint) { x, y };
+
+  struct DoublePoint guest;
+  util_localCurToGuest(&guest);
+  g_cursor.guest.x = lround(guest.x);
+  g_cursor.guest.y = lround(guest.y);
+}
+
+static void testInsetExit(void)
+{
+  reset();
+  setLocal(10, 20);
+  g_cursor.pos = (struct DoublePoint) { 9.75, 19.75 };
+
+  core_handleMouseNormal(-0.25, -0.25);
+
+  const int drop = first(EV_UNGRAB);
+  const int move = first(EV_WARP);
+  CHECK(drop >= 0);
+  CHECK(count(EV_WARP) == 1);
+  CHECK(move > drop);
+  CHECK(m.ev[move].x == 9);
+  CHECK(m.ev[move].y == 19);
+  CHECK(m.ev[move].exit);
+  CHECK(!g_cursor.inView);
+
+  core_handleGuestMouseUpdate();
+  CHECK(count(EV_GUEST) == 0);
+}
+
+static void startExit(void)
+{
+  reset();
+  setLocal(109, 50);
+  m.conf.req  = true;
+  m.conf.on   = true;
+  m.conf.hold = true;
+
+  core_handleMouseNormal(2, 0);
+}
+
+static void testExitWait(void)
+{
+  startExit();
+  const int drop = first(EV_UNGRAB);
+  CHECK(drop >= 0);
+  CHECK(count(EV_WARP) == 0);
+  CHECK(g_cursor.inView);
+}
+
+static void testExitGuest(void)
+{
+  startExit();
+  g_cursor.guest.x = 99;
+  core_handleGuestMouseUpdate();
+  CHECK(count(EV_GUEST) == 0);
+}
+
+static void startConf(void)
+{
+  reset();
+  setLocal(50, 50);
+  g_cursor.inView = false;
+
+  core_handleMouseNormal(0, 0);
+}
+
+static void testConfWait(void)
+{
+  startConf();
+  CHECK(m.conf.req);
+  CHECK(!m.conf.on);
+  CHECK(!g_cursor.inView);
+}
+
+static void testConfGuest(void)
+{
+  startConf();
+  core_handleGuestMouseUpdate();
+  CHECK(m.conf.req);
+  CHECK(count(EV_GUEST) == 0);
+}
+
+static void testCapWait(void)
+{
+  reset();
+  setLocal(50, 50);
+  g_params.captureInputOnly = true;
+
+  core_handleMouseGrabbed(1, 0);
+  CHECK(count(EV_MOTION) == 0);
+
+  core_setGrabQuiet(true);
+  CHECK(g_cursor.grab);
+  CHECK(m.lock.req);
+  CHECK(!m.lock.on);
+
+  core_handleMouseGrabbed(1, 0);
+  CHECK(count(EV_MOTION) == 0);
+}
+
+static void testCapRevoke(void)
+{
+  reset();
+  setLocal(50, 50);
+  g_params.captureInputOnly = true;
+  core_setGrabQuiet(true);
+
+  m.lock.on = true;
+  core_handleMouseGrabbed(1, 0);
+  CHECK(count(EV_MOTION) == 1);
+  CHECK(m.ev[first(EV_MOTION)].lock);
+
+  m.lock.on = false;
+  core_handleMouseGrabbed(1, 0);
+  CHECK(g_cursor.grab);
+  CHECK(count(EV_MOTION) == 1);
+}
+
+static void testCapRelease(void)
+{
+  reset();
+  setLocal(50, 50);
+  g_params.captureInputOnly = true;
+  core_setGrabQuiet(true);
+
+  m.lock.on = true;
+  core_handleMouseGrabbed(1, 0);
+  CHECK(count(EV_MOTION) == 1);
+
+  m.lock.hold = true;
+  core_setGrabQuiet(false);
+  CHECK(!g_cursor.grab);
+  CHECK(!m.lock.req);
+  CHECK(m.lock.on);
+
+  const int drop = first(EV_UNCAPTURE);
+  CHECK(drop >= 0);
+  CHECK(m.ev[drop].lock);
+
+  core_handleMouseGrabbed(1, 0);
+  CHECK(count(EV_MOTION) == 1);
+}
+
+struct Test
+{
+  const char * name;
+  void (*run)(void);
+};
+
+static const struct Test tests[] = {
+  { "inset-exit"     , testInsetExit   },
+  { "exit-delay"     , testExitWait    },
+  { "exit-guest"     , testExitGuest   },
+  { "confine-pending", testConfWait    },
+  { "confine-guest"  , testConfGuest   },
+  { "capture-pending", testCapWait     },
+  { "capture-revoked", testCapRevoke   },
+  { "capture-release", testCapRelease  },
+};
+
+int main(int argc, char ** argv)
+{
+  if (argc == 2)
+  {
+    for (unsigned int i = 0; i < sizeof(tests) / sizeof(tests[0]); ++i)
+      if (strcmp(argv[1], tests[i].name) == 0)
+      {
+        tests[i].run();
+        return 0;
+      }
+
+    fprintf(stderr, "unknown test: %s\n", argv[1]);
+    return EXIT_FAILURE;
+  }
+
+  if (argc != 1)
+    return EXIT_FAILURE;
+
+  for (unsigned int i = 0; i < sizeof(tests) / sizeof(tests[0]); ++i)
+    tests[i].run();
+  return 0;
+}