test: remove redundant, misbehaving test

This test failed differently on Windows than other platforms, but it doesn't really test anything new anyway

test/__snapshots__/index.spec.js.snap

@@ -1,11 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`lintStaged should exit with code 1 on linter errors 1`] = `
-"
-ERROR 
-× node -e \\"process.exit(1)\\" failed without output (FAILED)."
-`;
-
 exports[`lintStaged should load an npm config package when specified 1`] = `
 "
 LOG Running lint-staged with the following config:

test/index.spec.js

@@ -173,15 +173,4 @@ describe('lintStaged', () => {
 
     expect(logger.printHistory()).toMatchSnapshot()
   })
-
-  it('should exit with code 1 on linter errors', async () => {
-    const config = {
-      '*': 'node -e "process.exit(1)"'
-    }
-    mockCosmiconfigWith({ config })
-    getStagedFiles.mockImplementationOnce(async () => ['sample.java'])
-    const passed = await lintStaged({ quiet: true, shell: true }, logger)
-    expect(logger.printHistory()).toMatchSnapshot()
-    expect(passed).toBe(false)
-  })
 })