test: add test for supplying object config via node api

test/__snapshots__/index.spec.js.snap

@@ -78,6 +78,15 @@ ERROR Please make sure you have created it correctly.
 See https://github.com/okonet/lint-staged#configuration."
 `;
 
+exports[`lintStaged should use config object 1`] = `
+"
+LOG Running lint-staged with the following config:
+LOG {
+  '*': 'node -e \\"process.exit(1)\\"'
+}
+ERROR Unable to get staged files!"
+`;
+
 exports[`lintStaged should use cosmiconfig if no params are passed 1`] = `
 "
 ERROR Unable to get staged files!"

test/index.spec.js

@@ -120,6 +120,15 @@ describe('lintStaged', () => {
     expect(logger.printHistory()).toMatchSnapshot()
   })
 
+  it('should use config object', async () => {
+    const config = {
+      '*': 'node -e "process.exit(1)"'
+    }
+    expect.assertions(1)
+    await lintStaged({ config, debug: true, quiet: true }, logger)
+    expect(logger.printHistory()).toMatchSnapshot()
+  })
+
   it('should load an npm config package when specified', async () => {
     expect.assertions(1)
     jest.mock('my-lint-staged-config')