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tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp

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+#include "RuntimeLayerModel.h"
+
+#include <chrono>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+namespace
+{
+int gFailures = 0;
+
+void Expect(bool condition, const std::string& message)
+{
+	if (condition)
+		return;
+
+	++gFailures;
+	std::cerr << "FAIL: " << message << "\n";
+}
+
+std::filesystem::path MakeTestRoot()
+{
+	const auto stamp = std::chrono::steady_clock::now().time_since_epoch().count();
+	const std::filesystem::path root = std::filesystem::temp_directory_path() / ("render-cadence-layer-model-tests-" + std::to_string(stamp));
+	std::filesystem::create_directories(root);
+	return root;
+}
+
+void WriteFile(const std::filesystem::path& path, const std::string& contents)
+{
+	std::filesystem::create_directories(path.parent_path());
+	std::ofstream output(path, std::ios::binary);
+	output << contents;
+}
+
+RenderCadenceCompositor::SupportedShaderCatalog MakeCatalog(std::filesystem::path& root)
+{
+	root = MakeTestRoot();
+	WriteFile(root / "solid" / "shader.slang", "float4 shadeVideo(float2 uv) { return float4(uv, 0.0, 1.0); }\n");
+	WriteFile(root / "solid" / "shader.json", R"({
+		"id": "solid",
+		"name": "Solid",
+		"description": "Solid test shader",
+		"category": "Tests",
+		"entryPoint": "shadeVideo",
+		"parameters": [
+			{ "id": "gain", "label": "Gain", "type": "float", "default": 0.5 }
+		]
+	})");
+
+	RenderCadenceCompositor::SupportedShaderCatalog catalog;
+	std::string error;
+	Expect(catalog.Load(root, 4, error), error.empty() ? "catalog loads test shader" : error);
+	return catalog;
+}
+
+void TestSingleLayerLifecycle()
+{
+	std::filesystem::path root;
+	RenderCadenceCompositor::SupportedShaderCatalog catalog = MakeCatalog(root);
+
+	RenderCadenceCompositor::RuntimeLayerModel model;
+	std::string error;
+	Expect(model.InitializeSingleLayer(catalog, "solid", error), "model initializes a supported startup shader");
+	Expect(model.FirstLayerId() == "runtime-layer-1", "startup layer id is stable");
+
+	Expect(model.MarkBuildStarted(model.FirstLayerId(), "build started", error), "build start updates the layer");
+	RenderCadenceCompositor::RuntimeLayerModelSnapshot snapshot = model.Snapshot();
+	Expect(snapshot.displayLayers.size() == 1, "snapshot exposes the display layer");
+	Expect(snapshot.displayLayers[0].buildState == RenderCadenceCompositor::RuntimeLayerBuildState::Pending, "started layer is pending");
+	Expect(!snapshot.displayLayers[0].renderReady, "started layer is not render-ready yet");
+
+	RuntimeShaderArtifact artifact;
+	artifact.shaderId = "solid";
+	artifact.displayName = "Solid";
+	artifact.fragmentShaderSource = "void main(){}";
+	artifact.message = "build ready";
+	Expect(model.MarkBuildReady(artifact, error), "ready artifact updates the matching layer");
+
+	snapshot = model.Snapshot();
+	Expect(snapshot.compileSucceeded, "ready layer reports compile success");
+	Expect(snapshot.displayLayers[0].buildState == RenderCadenceCompositor::RuntimeLayerBuildState::Ready, "ready layer is marked ready");
+	Expect(snapshot.displayLayers[0].renderReady, "ready layer exposes render readiness");
+	Expect(snapshot.renderLayers.size() == 1, "ready layer produces one render layer artifact");
+	Expect(snapshot.renderLayers[0].artifact.shaderId == "solid", "render layer carries the artifact");
+
+	std::filesystem::remove_all(root);
+}
+
+void TestRejectsUnsupportedStartupShader()
+{
+	std::filesystem::path root;
+	RenderCadenceCompositor::SupportedShaderCatalog catalog = MakeCatalog(root);
+
+	RenderCadenceCompositor::RuntimeLayerModel model;
+	std::string error;
+	Expect(!model.InitializeSingleLayer(catalog, "missing", error), "model rejects unsupported shader ids");
+	Expect(!error.empty(), "unsupported shader rejection explains the problem");
+	Expect(model.Snapshot().displayLayers.empty(), "rejected startup shader leaves no display layer");
+
+	std::filesystem::remove_all(root);
+}
+
+void TestBuildFailureStaysDisplaySide()
+{
+	std::filesystem::path root;
+	RenderCadenceCompositor::SupportedShaderCatalog catalog = MakeCatalog(root);
+
+	RenderCadenceCompositor::RuntimeLayerModel model;
+	std::string error;
+	Expect(model.InitializeSingleLayer(catalog, "solid", error), "model initializes for failure test");
+	Expect(model.MarkBuildFailed(model.FirstLayerId(), "compile failed", error), "build failure updates the layer");
+
+	const RenderCadenceCompositor::RuntimeLayerModelSnapshot snapshot = model.Snapshot();
+	Expect(!snapshot.compileSucceeded, "failed layer reports compile failure");
+	Expect(snapshot.displayLayers[0].buildState == RenderCadenceCompositor::RuntimeLayerBuildState::Failed, "failed layer is marked failed");
+	Expect(!snapshot.displayLayers[0].renderReady, "failed layer is not render-ready");
+	Expect(snapshot.renderLayers.empty(), "failed layer does not produce a render artifact");
+
+	std::filesystem::remove_all(root);
+}
+
+void TestAddAndRemoveLayers()
+{
+	std::filesystem::path root;
+	RenderCadenceCompositor::SupportedShaderCatalog catalog = MakeCatalog(root);
+
+	RenderCadenceCompositor::RuntimeLayerModel model;
+	std::string error;
+	std::string firstLayerId;
+	std::string secondLayerId;
+	Expect(model.AddLayer(catalog, "solid", firstLayerId, error), "first layer can be added");
+	Expect(model.AddLayer(catalog, "solid", secondLayerId, error), "second layer can be added");
+	Expect(firstLayerId != secondLayerId, "added layers receive distinct ids");
+	Expect(model.Snapshot().displayLayers.size() == 2, "added layers appear in display snapshot");
+
+	Expect(model.RemoveLayer(firstLayerId, error), "existing layer can be removed");
+	RenderCadenceCompositor::RuntimeLayerModelSnapshot snapshot = model.Snapshot();
+	Expect(snapshot.displayLayers.size() == 1, "removed layer leaves snapshot");
+	Expect(snapshot.displayLayers[0].id == secondLayerId, "remaining layer identity is preserved");
+	Expect(!model.RemoveLayer(firstLayerId, error), "removed layer cannot be removed twice");
+
+	std::filesystem::remove_all(root);
+}
+}
+
+int main()
+{
+	TestSingleLayerLifecycle();
+	TestRejectsUnsupportedStartupShader();
+	TestBuildFailureStaysDisplaySide();
+	TestAddAndRemoveLayers();
+
+	if (gFailures != 0)
+	{
+		std::cerr << gFailures << " RenderCadenceCompositorRuntimeLayerModel test failure(s).\n";
+		return 1;
+	}
+
+	std::cout << "RenderCadenceCompositorRuntimeLayerModel tests passed.\n";
+	return 0;
+}