Use plain assert testing

__tests__/setup-elixir.test.js

@@ -1,18 +1,21 @@
 const {getElixirVersion} = require('../src/setup-elixir')
+const {deepStrictEqual} = require('assert')
 
-describe('getElixirVersion', () => {
-  test('actual version parsing', async () => {
-    const vsn = await getElixirVersion('v1.10.x', '23')
-    expect(vsn).toEqual(['v1.10.4', '23'])
-  })
+async function test() {
+  let vsn
+  vsn = await getElixirVersion('v1.10.x', '23')
+  deepStrictEqual(vsn, ['v1.10.4', '23'])
 
-  test('version range parsing', async () => {
-    const vsn = await getElixirVersion('^v1.10', '23')
-    expect(vsn).toEqual(['v1.10.4', '23'])
-  })
+  vsn = await getElixirVersion('^v1.10', '23')
+  deepStrictEqual(vsn, ['v1.10.4', '23'])
 
-  test('pre-release versions', async () => {
-    const vsn = await getElixirVersion('v1.11.0-rc.0', '23')
-    expect(vsn).toEqual(['v1.11.0-rc.0', '23'])
+  vsn = await getElixirVersion('v1.11.0-rc.0', '23')
+  deepStrictEqual(vsn, ['v1.11.0-rc.0', '23'])
+}
+
+test()
+  .then(() => process.exit(0))
+  .catch(err => {
+    console.error(err)
+    process.exit(1)
   })
-})

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "build": "ncc build src/setup-elixir.js",
     "format": "prettier \"src/**/*.js\"",
-    "test": "jest"
+    "test": "node __tests__/setup-elixir.test.js"
   },
   "husky": {
     "hooks": {
@@ -22,7 +22,6 @@
   "devDependencies": {
     "@zeit/ncc": "^0.22.1",
     "husky": "^4.2.5",
-    "jest": "^26.4.2",
     "prettier": "^2.0.5"
   }
 }