1 files changed, 43 insertions, 0 deletions
diff --git a/preact/test/browser/lifecycles/componentWillMount.test.js b/preact/test/browser/lifecycles/componentWillMount.test.js
new file mode 100644
index 0000000..880803e
--- /dev/null
+++ b/preact/test/browser/lifecycles/componentWillMount.test.js
@@ -0,0 +1,43 @@
+import { createElement, render, Component } from 'preact';
+import { setupScratch, teardown } from '../../_util/helpers';
+
+/** @jsx createElement */
+
+describe('Lifecycle methods', () => {
+	/** @type {HTMLDivElement} */
+	let scratch;
+
+	beforeEach(() => {
+		scratch = setupScratch();
+	});
+
+	afterEach(() => {
+		teardown(scratch);
+	});
+
+	describe('#componentWillMount', () => {
+		it('should update state when called setState in componentWillMount', () => {
+			let componentState;
+
+			class Foo extends Component {
+				constructor(props) {
+					super(props);
+					this.state = {
+						value: 0
+					};
+				}
+				componentWillMount() {
+					this.setState({ value: 1 });
+				}
+				render() {
+					componentState = this.state;
+					return <div />;
+				}
+			}
+
+			render(<Foo />, scratch);
+
+			expect(componentState).to.deep.equal({ value: 1 });
+		});
+	});
+});