Make test-cases more generic

__tests__/fixtures/empty_release/CHANGELOG.expected.md

@@ -0,0 +1,35 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.3.0] - 2019-12-06
+
+## [0.2.0] - 2019-09-13
+
+### Added
+
+-   First feature that is gonna make us money.
+-   Quite a few bugs, sorry in advance!
+
+### Changed
+
+-   Reworked the login system. You have to provide a password now!
+
+## [0.1.0] - 2019-09-05
+
+### Added
+
+-   Initial release :tada:
+
+[Unreleased]: https://github.com/foo/bar/compare/0.3.0...HEAD
+
+[0.3.0]: https://github.com/foo/bar/compare/0.2.0...0.3.0
+
+[0.2.0]: https://github.com/foo/bar/compare/0.1.0...0.2.0
+
+[0.1.0]: https://github.com/foo/bar/compare/1625533e04119e8496b14d5e18786f150b4fce4d...0.1.0

__tests__/fixtures/empty_release/CHANGELOG.md

@@ -0,0 +1,31 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.2.0] - 2019-09-13
+
+### Added
+
+-   First feature that is gonna make us money.
+-   Quite a few bugs, sorry in advance!
+
+### Changed
+
+-   Reworked the login system. You have to provide a password now!
+
+## [0.1.0] - 2019-09-05
+
+### Added
+
+-   Initial release :tada:
+
+[Unreleased]: https://github.com/foo/bar/compare/0.2.0...HEAD
+
+[0.2.0]: https://github.com/foo/bar/compare/0.1.0...0.2.0
+
+[0.1.0]: https://github.com/foo/bar/compare/1625533e04119e8496b14d5e18786f150b4fce4d...0.1.0

__tests__/fixtures/empty_release/fixture.ts

@@ -0,0 +1,4 @@
+export default {
+  version: '0.3.0',
+  date: '2019-12-06'
+};

__tests__/fixtures/standard/fixture.ts

@@ -0,0 +1,4 @@
+export default {
+  version: '0.3.0',
+  date: '2019-12-06'
+};

__tests__/formatDate.test.ts

@@ -1,25 +1,13 @@
 import formatDate from "../src/formatDate";
 
-it("should format a date with a single digit day correctly", function() {
-  const date = new Date(Date.parse("Dec 09 2019"));
+it.each([
+  ["Dec 09 2019", "2019-12-09"],
+  ["Dec 16 2019", "2019-12-16"],
+  ["Jan 09 2019", "2019-01-09"]
+])("should format '%s' as '%s'", function(given, expected) {
+  const date = new Date(Date.parse(given));
 
   const formatted = formatDate(date);
 
-  expect(formatted).toEqual("2019-12-09");
-});
-
-it("should format a date with a double digit day correctly", function() {
-  const date = new Date(Date.parse("Dec 16 2019"));
-
-  const formatted = formatDate(date);
-
-  expect(formatted).toEqual("2019-12-16");
-});
-
-it("should format a date with a single digit month correctly", function() {
-  const date = new Date(Date.parse("Jan 09 2019"));
-
-  const formatted = formatDate(date);
-
-  expect(formatted).toEqual("2019-01-09");
+  expect(formatted).toEqual(expected);
 });

__tests__/updateChangelog.test.ts

@@ -1,18 +1,32 @@
 import updateChangelog from "../src/updateChangelog";
 import { read } from "to-vfile";
 
-it("should update the changelog correctly", async function() {
-  const before = await read("./__tests__/fixtures/CHANGELOG.1.md", {
-    encoding: "utf-8"
-  });
-  const expected = await read("./__tests__/fixtures/CHANGELOG.1.expected.md", {
-    encoding: "utf-8"
-  });
+interface Fixture {
+  version: string;
+  date: string;
+}
 
-  const actual = await updateChangelog(before, "0.3.0", "2019-12-06");
+it.each(["empty_release", "standard"])(
+  `should update %s changelog`,
+  async function(testcase) {
+    const before = await read(`./__tests__/fixtures/${testcase}/CHANGELOG.md`, {
+      encoding: "utf-8"
+    });
+    const expected = await read(
+      `./__tests__/fixtures/${testcase}/CHANGELOG.expected.md`,
+      {
+        encoding: "utf-8"
+      }
+    );
+    const release: Fixture = await import(
+      `./fixtures/${testcase}/fixture`
+    ).then(module => module.default);
 
-  const actualContent = actual.toString("utf-8");
-  const expectedContent = expected.toString("utf-8");
+    const actual = await updateChangelog(before, release.version, release.date);
 
-  expect(actualContent).toEqual(expectedContent);
-});
+    const actualContent = actual.toString("utf-8");
+    const expectedContent = expected.toString("utf-8");
+
+    expect(actualContent).toEqual(expectedContent);
+  }
+);