test: add

test/api/CLI.test.js

@@ -1699,4 +1699,34 @@ describe("CLI API", () => {
             expect(command.helpInformation()).toContain("--no-boolean  Negated description");
         });
     });
+
+    describe("custom help output", () => {
+        let consoleSpy;
+        let exitSpy;
+
+        beforeEach(async () => {
+            consoleSpy = jest.spyOn(global.console, "log");
+            exitSpy = jest.spyOn(process, "exit").mockImplementation(() => {});
+
+            cli.program.option("--color [value]", "any color", "blue");
+            await new Promise((resolve, reject) => {
+                try {
+                    cli.run(["help", "--color"], { from: "user" });
+                    resolve();
+                } catch (error) {
+                    reject(error);
+                }
+            });
+        });
+
+        afterEach(async () => {
+            consoleSpy.mockRestore();
+            exitSpy.mockRestore();
+        });
+
+        it("should display help information", () => {
+            expect(exitSpy).toHaveBeenCalledWith(0);
+            expect(consoleSpy.mock.calls).toMatchSnapshot();
+        });
+    });
 });

test/api/__snapshots__/CLI.test.js.snap.webpack4

@@ -0,0 +1,31 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CLI API custom help output should display help information 1`] = `
+Array [
+  Array [
+    "Usage: webpack --color [value]",
+  ],
+  Array [
+    "Description: any color",
+  ],
+  Array [
+    "Default value: \\"blue\\"",
+  ],
+  Array [
+    "",
+  ],
+  Array [
+    "To see list of all supported commands and options run 'webpack --help=verbose'.
+",
+  ],
+  Array [
+    "Webpack documentation: https://webpack.js.org/.",
+  ],
+  Array [
+    "CLI documentation: https://webpack.js.org/api/cli/.",
+  ],
+  Array [
+    "Made with ♥ by the webpack team.",
+  ],
+]
+`;

test/api/__snapshots__/CLI.test.js.snap.webpack5

@@ -0,0 +1,31 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CLI API custom help output should display help information 1`] = `
+Array [
+  Array [
+    "Usage: webpack --color [value]",
+  ],
+  Array [
+    "Description: any color",
+  ],
+  Array [
+    "Default value: \\"blue\\"",
+  ],
+  Array [
+    "",
+  ],
+  Array [
+    "To see list of all supported commands and options run 'webpack --help=verbose'.
+",
+  ],
+  Array [
+    "Webpack documentation: https://webpack.js.org/.",
+  ],
+  Array [
+    "CLI documentation: https://webpack.js.org/api/cli/.",
+  ],
+  Array [
+    "Made with ♥ by the webpack team.",
+  ],
+]
+`;