@@ -0,0 +1,3 @@
+"use strict";
+
+module.exports = [[/runtime module load failed/]];
@@ -0,0 +1,3 @@
+it("should surface a failing runtime module load as a build error", () => {
+	// the build error is asserted by errors.js
+});
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+"use strict";
+
+const PLUGIN_NAME = "AddLazyRuntimeModuleErrorTestPlugin";
+
+/** @type {import("../../../../types").Configuration} */
+module.exports = {
+	plugins: [
+		{
+			apply(compiler) {
+				compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
+					compilation.hooks.additionalTreeRuntimeRequirements.tap(
+						PLUGIN_NAME,
+						(chunk) => {
+							compilation.addLazyRuntimeModule(
+								chunk,
+								() => Promise.reject(new Error("runtime module load failed")),
+								(Ctor) => new Ctor()
+							);
+						}
+					);
+				});
+			}
+		}
+	]
+};
@@ -0,0 +1,19 @@
+"use strict";
+
+const RuntimeModule = require("../../../../lib/RuntimeModule");
+
+// Loaded through `addLazyRuntimeModule`, so it must reach the chunk's runtime.
+class MarkerRuntimeModule extends RuntimeModule {
+	constructor() {
+		super("lazy marker");
+	}
+
+	/**
+	 * @returns {string} runtime code
+	 */
+	generate() {
+		return 'globalThis.__lazyRuntimeMarker = "attached";';
+	}
+}
+
+module.exports = MarkerRuntimeModule;
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+it("should attach a runtime module queued through addLazyRuntimeModule", () => {
+	expect(globalThis.__lazyRuntimeMarker).toBe("attached");
+});
@@ -0,0 +1,25 @@
+"use strict";
+
+const PLUGIN_NAME = "AddLazyRuntimeModuleTestPlugin";
+
+/** @type {import("../../../../types").Configuration} */
+module.exports = {
+	plugins: [
+		{
+			apply(compiler) {
+				compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
+					compilation.hooks.additionalTreeRuntimeRequirements.tap(
+						PLUGIN_NAME,
+						(chunk) => {
+							compilation.addLazyRuntimeModule(
+								chunk,
+								() => Promise.resolve(require("./MarkerRuntimeModule")),
+								(MarkerRuntimeModule) => new MarkerRuntimeModule()
+							);
+						}
+					);
+				});
+			}
+		}
+	]
+};
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+"use strict";`
	`2`	`+`
	`3`	`+module.exports = [[/runtime module load failed/]];`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+it("should surface a failing runtime module load as a build error", () => {`
	`2`	`+ // the build error is asserted by errors.js`
	`3`	`+});`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+it("should attach a runtime module queued through addLazyRuntimeModule", () => {`
	`2`	`+ expect(globalThis.__lazyRuntimeMarker).toBe("attached");`
	`3`	`+});`