Improve error message when url not found.

__tests__/graalvm.test.ts

@@ -0,0 +1,25 @@
+import * as path from 'path'
+import * as graalvm from '../src/graalvm'
+import {expect, test} from '@jest/globals'
+
+process.env['RUNNER_TOOL_CACHE'] = path.join(__dirname, 'TOOL_CACHE')
+process.env['RUNNER_TEMP'] = path.join(__dirname, 'TEMP')
+
+test('request invalid version/javaVersion', async () => {
+  for (var combination of [
+    ['22.3.0', '7'],
+    ['22.3', '17'],
+    ['22.3', '7']
+  ]) {
+    let error = new Error('unexpected')
+    try {
+      await graalvm.setUpGraalVMRelease('', combination[0], combination[1])
+    } catch (err) {
+      error = err
+    }
+
+    expect(error).not.toBeUndefined()
+    expect(error.message).toContain('Failed to download')
+    expect(error.message).toContain('Are you sure version')
+  }
+})