Add backspace/tab tests for input elements [NFC]

test/browser/test_glfw_events.c

@@ -163,6 +163,27 @@ static void on_error(int error, const char *msg) {
 }
 #endif
 
+void test_text_input() {
+  EM_ASM({
+    // Create an input element, add it to the DOM, and focus on it.
+    input = document.createElement("input");
+    document.body.appendChild(input);
+
+    // When sent to an input element, backspace and tab are treated like any
+    // other key. TODO: this is not yet functional, see
+    // https://github.com/emscripten-core/emscripten/pull/22879
+    // After that lands, the two "!" here can be removed.
+    assert( simulateKeyEvent("keydown", 65, 65, 'A', input));
+    assert(!simulateKeyEvent("keydown",  8,  8, "Backspace", input));
+    assert(!simulateKeyEvent("keydown",  9,  9, "Tab", input));
+
+    // When sent anywhere else, backspace and tab are preventDefaulted.
+    assert( simulateKeyEvent("keydown", 65, 65, 'A'));
+    assert(!simulateKeyEvent("keydown",  8,  8, "Backspace"));
+    assert(!simulateKeyEvent("keydown",  9,  9, "Tab"));
+  });
+}
+
 int main() {
   unsigned int success = (1 << (sizeof(g_tests) / sizeof(test_t))) - 1; // (2^count)-1;
 
@@ -235,6 +256,8 @@ int main() {
     }
   }
 
+  test_text_input();
+
   glfwTerminate();
 
   printf("%d == %d = %d", g_state, success, g_state == success);

test/browser/test_sdl_key.c

@@ -62,10 +62,33 @@ void one() {
 #endif
 }
 
+void test_text_input() {
+  EM_ASM({
+    // Create an input element, add it to the DOM, and focus on it.
+    input = document.createElement("input");
+    document.body.appendChild(input);
+
+    // When sent to an input element, backspace and tab are treated like any
+    // other key. TODO: this is not yet functional, see
+    // https://github.com/emscripten-core/emscripten/pull/22879
+    // After that lands, the two "!" here can be removed.
+    assert( simulateKeyEvent("keydown", 65, 65, 'A', input));
+    assert(!simulateKeyEvent("keydown",  8,  8, "Backspace", input));
+    assert(!simulateKeyEvent("keydown",  9,  9, "Tab", input));
+
+    // When sent anywhere else, backspace and tab are preventDefaulted.
+    assert( simulateKeyEvent("keydown", 65, 65, 'A'));
+    assert(!simulateKeyEvent("keydown",  8,  8, "Backspace"));
+    assert(!simulateKeyEvent("keydown",  9,  9, "Tab"));
+  });
+}
+
 int main(int argc, char **argv) {
   SDL_Init(SDL_INIT_VIDEO);
   SDL_Surface *screen = SDL_SetVideoMode(600, 450, 32, SDL_HWSURFACE);
 
+  test_text_input();
+
 #ifdef TEST_EMSCRIPTEN_SDL_SETEVENTHANDLER
   emscripten_SDL_SetEventHandler(EventHandler, 0);
 #endif