Create commands/create-matrix.js

tests/commands/create-matrix.test.js

@@ -0,0 +1,20 @@
+const fs = require('fs')
+const path = require('path')
+const { execSync } = require('child_process')
+
+beforeEach(() => {
+  fs.copyFileSync('tests/__data__/input/test.db', 'tests/__data__/temp/test.db')
+})
+
+afterEach(() => {
+  fs.rmdirSync('tests/__data__/temp', { recursive: true })
+  fs.mkdirSync('tests/__data__/temp')
+})
+
+it('can create valid matrix', () => {
+  const result = execSync(
+    'DB_FILEPATH=tests/__data__/temp/test.db node scripts/commands/create-matrix.js',
+    { encoding: 'utf8' }
+  )
+  expect(result).toBe('::set-output name=matrix::{"cluster_id":[1]}\n')
+})