Get Julia versions from versions.json (#24)

This replaces the hardcoded versions array which will decouple the setup-julia version and the installable Julia versions.

__tests__/installer.test.ts

@@ -0,0 +1,113 @@
+// The testing setup has been derived from the actions/setup-go@bc6edb5 action.
+// Check README.md for licence information.
+
+import * as path from 'path'
+
+import * as io from '@actions/io'
+
+import nock = require('nock')
+import * as semver from 'semver'
+
+const testVersions = [
+    '0.1.2',       '0.2.0',           '0.2.1',          '0.3.0',
+    '0.3.1',       '0.3.10',          '0.3.11',         '0.3.12',
+    '0.3.2',       '0.3.3',           '0.3.4',          '0.3.5',
+    '0.3.6',       '0.3.7',           '0.3.8',          '0.3.9',
+    '0.4.0',       '0.4.0-rc1',       '0.4.0-rc2',      '0.4.0-rc3',
+    '0.4.0-rc4',   '0.4.1',           '0.4.2',          '0.4.3',
+    '0.4.4',       '0.4.5',           '0.4.6',          '0.4.7',
+    '0.5.0',       '0.5.0-rc0',       '0.5.0-rc1',      '0.5.0-rc2',
+    '0.5.0-rc3',   '0.5.0-rc4',       '0.5.1',          '0.5.2',
+    '0.6.0',       '0.6.0-pre.alpha', '0.6.0-pre.beta', '0.6.0-rc1',
+    '0.6.0-rc2',   '0.6.0-rc3',       '0.6.1',          '0.6.2',
+    '0.6.3',       '0.6.4',           '0.7.0',          '0.7.0-alpha',
+    '0.7.0-beta',  '0.7.0-beta2',     '0.7.0-rc1',      '0.7.0-rc2',
+    '0.7.0-rc3',   '1.0.0',           '1.0.0-rc1',      '1.0.1',
+    '1.0.2',       '1.0.3',           '1.0.4',          '1.0.5',
+    '1.1.0',       '1.1.0-rc1',       '1.1.0-rc2',      '1.1.1',
+    '1.2.0',       '1.2.0-rc1',       '1.2.0-rc2',      '1.2.0-rc3',
+    '1.3.0-alpha', '1.3.0-rc1',       '1.3.0-rc2',      '1.3.0-rc3',
+    '1.3.0-rc4'
+]
+
+const toolDir = path.join(__dirname, 'runner', 'tools')
+const tempDir = path.join(__dirname, 'runner', 'temp')
+const fixtureDir = path.join(__dirname, 'fixtures')
+
+process.env['RUNNER_TOOL_CACHE'] = toolDir;
+process.env['RUNNER_TEMP'] = tempDir;
+
+import * as installer from '../src/installer'
+
+describe('version matching tests', () => {
+    describe('specific versions', () => {
+        it('Doesn\'t change the version when given a valid semver version', async () => {
+            expect(await installer.getJuliaVersion([], '1.0.5')).toEqual('1.0.5')
+            expect(await installer.getJuliaVersion(['v1.0.5', 'v1.0.6'], '1.0.5')).toEqual('1.0.5')
+            expect(await installer.getJuliaVersion(['v1.0.4', 'v1.0.5'], '1.0.5')).toEqual('1.0.5')
+            expect(await installer.getJuliaVersion(['v1.0.4'], '1.0.5')).toEqual('1.0.5')
+            expect(await installer.getJuliaVersion([], '1.3.0-alpha')).toEqual('1.3.0-alpha')
+            expect(await installer.getJuliaVersion(['v1.2.0', 'v1.3.0-alpha', 'v1.3.0-rc1', 'v1.3.0'], '1.3.0-alpha')).toEqual('1.3.0-alpha')
+            expect(await installer.getJuliaVersion([], '1.3.0-rc2')).toEqual('1.3.0-rc2')
+        })
+
+        it('Doesn\'t change the version when given `nightly`', async () => {
+            expect(await installer.getJuliaVersion([], 'nightly')).toEqual('nightly')
+            expect(await installer.getJuliaVersion(testVersions, 'nightly')).toEqual('nightly')
+        })
+    })
+
+    describe('version ranges', () => {
+        it('Chooses the highest available version that matches the input', async () => {
+            expect(await installer.getJuliaVersion(testVersions, '1')).toEqual('1.2.0')
+            expect(await installer.getJuliaVersion(testVersions, '1.0')).toEqual('1.0.5')
+            expect(await installer.getJuliaVersion(testVersions, '^1.3.0-rc1')).toEqual('1.3.0-rc4')
+            expect(await installer.getJuliaVersion(testVersions, '^1.2.0-rc1')).toEqual('1.2.0')
+        })
+    })
+
+    describe('node-semver behaviour', () => {
+        describe('Windows installer change', () => {
+            it('Correctly understands >1.4.0', () => {
+                expect(semver.gtr('1.4.0-rc1', '1.3', {includePrerelease: true})).toBeTruthy()
+                expect(semver.gtr('1.4.0-DEV', '1.3', {includePrerelease: true})).toBeTruthy()
+                expect(semver.gtr('1.3.1', '1.3', {includePrerelease: true})).toBeFalsy()
+                expect(semver.gtr('1.3.2-rc1', '1.3', {includePrerelease: true})).toBeFalsy()
+            })
+        })
+    })
+})
+
+describe('installer tests', () => {
+    beforeAll(async () => {
+        await io.rmRF(toolDir)
+        await io.rmRF(tempDir)
+    }, 100000)
+
+    afterAll(async () => {
+        try {
+            await io.rmRF(toolDir)
+            await io.rmRF(tempDir)
+        } catch {
+            console.log('Failed to remove test directories')
+        }
+    }, 100000)
+
+    describe('versions.json parsing', () => {
+        // Instead of downloading versions.json, use fixtures/versions.json
+        beforeEach(() => {
+            nock('https://julialang-s3.julialang.org')
+            .get('/bin/versions.json')
+            .replyWithFile(200, path.join(fixtureDir, 'versions.json'))
+        })
+    
+        afterEach(() => {
+            nock.cleanAll()
+            nock.enableNetConnect()
+        })
+    
+        it('Extracts the list of available versions', async () => {
+            expect(await (await installer.getJuliaVersions(await installer.getJuliaVersionInfo())).sort()).toEqual(testVersions.sort())
+        })
+    })
+})