2 files changed, 37 insertions, 0 deletions
diff --git a/crates/fparkan-test-support/Cargo.toml b/crates/fparkan-test-support/Cargo.toml
new file mode 100644
index 0000000..56a079f
--- /dev/null
+++ b/crates/fparkan-test-support/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "fparkan-test-support"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+
+[dependencies]
+fparkan-render = { path = "../fparkan-render" }
+
+[lints]
+workspace = true
diff --git a/crates/fparkan-test-support/src/lib.rs b/crates/fparkan-test-support/src/lib.rs
new file mode 100644
index 0000000..cb4f552
--- /dev/null
+++ b/crates/fparkan-test-support/src/lib.rs
@@ -0,0 +1,25 @@
+#![forbid(unsafe_code)]
+//! Dev-only synthetic builders and fake ports.
+
+use fparkan_render::{FrameOutput, RenderBackend, RenderCommandList, RenderError};
+
+/// Fake clock.
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+pub struct FakeClock {
+    /// Current tick.
+    pub tick: u64,
+}
+
+/// Recording backend.
+#[derive(Clone, Debug, Default)]
+pub struct RecordingRenderBackend {
+    /// Recorded command lists.
+    pub captures: Vec<RenderCommandList>,
+}
+
+impl RenderBackend for RecordingRenderBackend {
+    fn execute(&mut self, commands: &RenderCommandList) -> Result<FrameOutput, RenderError> {
+        self.captures.push(commands.clone());
+        Ok(FrameOutput)
+    }
+}