diff --git a/tests/unit/gui/test-gui-key.cpp b/tests/unit/gui/test-gui-key.cpp
index 497d999d5..e0ddc9d64 100644
--- a/tests/unit/gui/test-gui-key.cpp
+++ b/tests/unit/gui/test-gui-key.cpp
@@ -26,6 +26,8 @@
 extern "C"
 {
 #include "src/gui/gui-key.h"
+
+extern int gui_key_cmp (const char *key, const char *search, int context);
 }
 
 TEST_GROUP(GuiKey)
@@ -233,7 +235,43 @@ TEST(GuiKey, Search)
 
 TEST(GuiKey, Cmp)
 {
-    /* TODO: write tests */
+    LONGS_EQUAL(0, gui_key_cmp ("", "", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(-97, gui_key_cmp ("", "a", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "a", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(32, gui_key_cmp ("meta-a", "meta-A", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(-99, gui_key_cmp ("meta-a", "meta-ac", GUI_KEY_CONTEXT_DEFAULT));
+    LONGS_EQUAL(0, gui_key_cmp ("meta-ac", "meta-a", GUI_KEY_CONTEXT_DEFAULT));
+
+    LONGS_EQUAL(0, gui_key_cmp ("", "", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(-97, gui_key_cmp ("", "a", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "a", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(32, gui_key_cmp ("meta-a", "meta-A", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(-99, gui_key_cmp ("meta-a", "meta-ac", GUI_KEY_CONTEXT_SEARCH));
+    LONGS_EQUAL(0, gui_key_cmp ("meta-ac", "meta-a", GUI_KEY_CONTEXT_SEARCH));
+
+    LONGS_EQUAL(0, gui_key_cmp ("", "", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(-97, gui_key_cmp ("", "a", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "a", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(32, gui_key_cmp ("meta-a", "meta-A", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(-99, gui_key_cmp ("meta-a", "meta-ac", GUI_KEY_CONTEXT_CURSOR));
+    LONGS_EQUAL(0, gui_key_cmp ("meta-ac", "meta-a", GUI_KEY_CONTEXT_CURSOR));
+
+    LONGS_EQUAL(1, gui_key_cmp ("", "", GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(1, gui_key_cmp ("a", "", GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(1, gui_key_cmp ("", "a", GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(0, gui_key_cmp ("a", "a", GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(0, gui_key_cmp ("@chat(fset.fset):button2",
+                                "@chat(fset.fset):button2",
+                                GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(0, gui_key_cmp ("@chat(fset.fset):button2-gesture-right",
+                                "@chat(fset.fset):button2*",
+                                GUI_KEY_CONTEXT_MOUSE));
+    LONGS_EQUAL(1, gui_key_cmp ("@chat(Fset.fset):button2-gesture-right",
+                                "@chat(fset.fset):button2*",
+                                GUI_KEY_CONTEXT_MOUSE));
 }
 
 /*