Add missing files

api/sixtyfps-cpp/include/sixtyfps_testing.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include "sixtyfps.h"
+
+namespace sixtyfps::testing {
+    inline void ellapse_time(int64_t time_in_ms) {
+        internal::sixtyfps_test_ellapse_time(time_in_ms);
+    }
+} // namespace sixtyfps

sixtyfps_runtime/corelib/abi/tests.rs

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+//! Functions usefull for testing
+
+/// SixtyFPS animations do not use real time, but use a mocked time.
+/// Normally, the event loop update the time of the animation using
+/// real time, but in tests, it is more convinient to use the fake time.
+/// This function will add some milliseconds to the fake time
+#[no_mangle]
+pub extern "C" fn sixtyfps_test_ellapse_time(time_in_ms: u64) {
+    crate::animations::CURRENT_ANIMATION_DRIVER.with(|driver| {
+        let mut tick = driver.current_tick();
+        tick += instant::Duration::from_millis(time_in_ms);
+        driver.update_animations(tick)
+    })
+}
+
+/// Somehow this is required for the extern "C" things to be exported in a dependent dynlib
+#[doc(hidden)]
+pub fn dummy() {
+    #[derive(Clone)]
+    struct Foo;
+    foo(Foo);
+    fn foo(f: impl Clone) {
+        let _ = f.clone();
+    }
+}