Added missing files, refactored ui_switch_win to check win exists

tests/test_cmd_win.c

@@ -0,0 +1,39 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <setjmp.h>
+#include <cmocka.h>
+#include <stdlib.h>
+#include <glib.h>
+
+#include "ui/ui.h"
+#include "ui/mock_ui.h"
+
+#include "command/commands.h"
+
+void cmd_win_shows_message_when_win_doesnt_exist(void **state)
+{
+    mock_cons_show();
+    CommandHelp *help = malloc(sizeof(CommandHelp));
+    gchar *args[] = { "3", NULL };
+
+    ui_switch_win_expect_and_return(3, FALSE);
+    expect_cons_show("Window 3 does not exist.");
+
+    gboolean result = cmd_win(args, *help);
+    assert_true(result);
+
+    free(help);
+}
+
+void cmd_win_switches_to_given_win_when_exists(void **state)
+{
+    CommandHelp *help = malloc(sizeof(CommandHelp));
+    gchar *args[] = { "12", NULL };
+
+    ui_switch_win_expect_and_return(12, TRUE);
+
+    gboolean result = cmd_win(args, *help);
+    assert_true(result);
+
+    free(help);
+}