diff --git a/test/unit/src/rendering/renderers/webGl/WebGlRenderer.test.js b/test/unit/src/rendering/renderers/webGl/WebGlRenderer.test.js
index d5dc41b3..f2647776 100644
--- a/test/unit/src/rendering/renderers/webGl/WebGlRenderer.test.js
+++ b/test/unit/src/rendering/renderers/webGl/WebGlRenderer.test.js
@@ -1,9 +1,11 @@
 import { assertEquals, assertRejects, assertStrictEquals } from "std/testing/asserts.ts";
 import { CustomMaterialData, Entity, Material, MaterialMap, Mesh, ShaderSource, VertexState, WebGlMaterialConfig, WebGlMaterialMapType, WebGlRenderer, WebGlRendererError } from "../../../../../../src/mod.js";
-import { assertHasSingleContext, runWithWebGlMocksAsync, setWebGlContextSupported } from "./shared/webGlMocks.js";
+import { assertHasSingleWebGlContext, runWithWebGlMocksAsync, setWebGlContextSupported } from "./shared/webGlMocks.js";
 import { assertIsType, testTypes } from "../../../../shared/typeAssertions.js";
 import { createCam, createCubeEntity, createVertexState } from "../shared/sceneUtil.js";
 import { assertLogEntryEquals, assertLogEquals } from "./shared/WebGlCommandLog.js";
+import { assertHasSingle2dRenderingContext } from "./shared/RenderingContext2d.js";
+import { assertSpyCall, assertSpyCalls, spy } from "std/testing/mock.ts";
 
 async function basicRendererSetup() {
 	const renderer = new WebGlRenderer();
@@ -15,7 +17,7 @@ async function basicRendererSetup() {
 	const scene = new Entity();
 	scene.add(cam);
 
-	const context = assertHasSingleContext();
+	const context = assertHasSingleWebGlContext();
 
 	return { renderer, domTarget, camComponent, scene, ...context };
 }
@@ -88,10 +90,25 @@ Deno.test({
 
 			const domTarget = renderer.createDomTarget();
 
+			const context2d = assertHasSingle2dRenderingContext();
+			const { commandLog, canvas: webGlCanvas } = assertHasSingleWebGlContext();
+
+			const clearRectSpy = spy(context2d, "clearRect");
+			const drawImageSpy = spy(context2d, "drawImage");
+
 			const { camComponent } = createCam();
 			domTarget.render(camComponent);
 
-			const { commandLog } = assertHasSingleContext();
+			assertSpyCalls(clearRectSpy, 1);
+			assertSpyCall(clearRectSpy, 0, {
+				args: [0, 0, 300, 150],
+			});
+			assertSpyCalls(drawImageSpy, 1);
+			assertEquals(drawImageSpy.calls[0].args.length, 3);
+			assertStrictEquals(drawImageSpy.calls[0].args[0], webGlCanvas);
+			assertEquals(drawImageSpy.calls[0].args[1], 0);
+			assertEquals(drawImageSpy.calls[0].args[2], 0);
+
 			commandLog.assertCount(5);
 
 			commandLog.assertLogEquals([
@@ -127,7 +144,7 @@ Deno.test({
 			const renderer = new WebGlRenderer();
 			await renderer.init();
 
-			const { commandLog, canvas } = assertHasSingleContext();
+			const { commandLog, canvas } = assertHasSingleWebGlContext();
 
 			const domTargetA = renderer.createDomTarget();
 			domTargetA.resize(100, 200);
diff --git a/test/unit/src/rendering/renderers/webGl/shared/RenderingContext2d.js b/test/unit/src/rendering/renderers/webGl/shared/RenderingContext2d.js
index 66842578..8168c79c 100644
--- a/test/unit/src/rendering/renderers/webGl/shared/RenderingContext2d.js
+++ b/test/unit/src/rendering/renderers/webGl/shared/RenderingContext2d.js
@@ -1,3 +1,5 @@
+import { assertEquals } from "std/testing/asserts.ts";
+
 export class RenderingContext2d {
 	/**
 	 * @param {CanvasImageSource} image
@@ -5,12 +7,27 @@ export class RenderingContext2d {
 	 * @param {number} dy
 	 */
 	drawImage(image, dx, dy) {}
+
+	clearRect() {}
 }
 
+/** @type {RenderingContext2d[]} */
+let created2dRenderingContexts = [];
+
 /**
  * @param {{width: number, height: number}} canvas
  */
 export function create2dRenderingContext(canvas) {
 	const context = new RenderingContext2d();
+	created2dRenderingContexts.push(context);
 	return context;
 }
+
+export function assertHasSingle2dRenderingContext() {
+	assertEquals(created2dRenderingContexts.length, 1, 'Expected to have exactly one canvas with getContext("2d")');
+	return created2dRenderingContexts[0];
+}
+
+export function clearCreated2dRenderingContexts() {
+	created2dRenderingContexts = [];
+}
diff --git a/test/unit/src/rendering/renderers/webGl/shared/webGlMocks.js b/test/unit/src/rendering/renderers/webGl/shared/webGlMocks.js
index 1ed45fd4..7873b717 100644
--- a/test/unit/src/rendering/renderers/webGl/shared/webGlMocks.js
+++ b/test/unit/src/rendering/renderers/webGl/shared/webGlMocks.js
@@ -1,4 +1,4 @@
-import { create2dRenderingContext } from "./RenderingContext2d.js";
+import { clearCreated2dRenderingContexts, create2dRenderingContext } from "./RenderingContext2d.js";
 import { createWebGlRenderingContext } from "./WebGlRenderingContext.js";
 
 const oldDocument = globalThis.document;
@@ -54,6 +54,7 @@ export function installWebGlMocks() {
 export function uninstallWebGlMocks() {
 	globalThis.document = oldDocument;
 	installed = false;
+	clearCreated2dRenderingContexts();
 }
 
 /**
@@ -86,7 +87,7 @@ export function set2dContextSupported(supported) {
 	context2dSupported = supported;
 }
 
-export function assertHasSingleContext() {
+export function assertHasSingleWebGlContext() {
 	if (createdContexts.length != 1) {
 		throw new Error("Expected exactly one webgl context to be created");
 	}