Use semver in toSemVer().

__tests__/utils.test.ts

@@ -0,0 +1,34 @@
+import * as path from 'path'
+import {expect, test} from '@jest/globals'
+import {toSemVer} from '../src/utils'
+
+test('convert version', async () => {
+  for (var inputAndExpectedOutput of [
+    ['22', '22.0.0'],
+    ['22.0', '22.0.0'],
+    ['22.0.0', '22.0.0'],
+    ['22.0.0.2', '22.0.0-2'],
+    ['22-ea', '22.0.0-ea'],
+    ['22.0-ea', '22.0.0-ea'],
+    ['22.0.0-ea', '22.0.0-ea']
+  ]) {
+    expect(toSemVer(inputAndExpectedOutput[0])).toBe(inputAndExpectedOutput[1])
+  }
+})
+
+test('convert invalid version', async () => {
+  for (var input of ['dev', 'abc', 'a.b.c']) {
+    let error = new Error('unexpected')
+    try {
+      toSemVer(input)
+    } catch (err) {
+      if (!(err instanceof Error)) {
+        fail(`Unexpected non-Error: ${err}`)
+      }
+      error = err
+    }
+
+    expect(error).not.toBeUndefined()
+    expect(error.message).toContain('Unable to convert')
+  }
+})