test example

[see-sharp-dev]

This is an example of failing tests.
If I ran go test ./... -race the data race will be detected.

WARNING: DATA RACE
Read at 0x00c0000160f8 by goroutine 6:
  runtime.slicecopy()
      /usr/local/go/src/runtime/slice.go:355 +0x0
  github.com/casbin/govaluate.parseTokens()
      /xxx/tmp/govaluate/parsing.go:54 +0x3cc
  github.com/casbin/govaluate.NewEvaluableExpressionWithFunctions()
      /xxx/tmp/govaluate/EvaluableExpression.go:100 +0xb4
  github.com/casbin/govaluate.NewEvaluableExpression()
      /xxx/tmp/govaluate/EvaluableExpression.go:48 +0x94
  github.com/casbin/govaluate.TestA()
      /xxx/tmp/govaluate/EvaluableExpression_test.go:8 +0x34
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x184
  testing.(*T).Run.gowrap1()
      /usr/local/go/src/testing/testing.go:1743 +0x40

Previous write at 0x00c0000160f8 by goroutine 7:
  runtime.slicecopy()
      /usr/local/go/src/runtime/slice.go:355 +0x0
  github.com/casbin/govaluate.parseTokens()
      /xxx/tmp/govaluate/parsing.go:54 +0x3cc
  github.com/casbin/govaluate.NewEvaluableExpressionWithFunctions()
      /xxx/tmp/govaluate/EvaluableExpression.go:100 +0xb4
  github.com/casbin/govaluate.NewEvaluableExpression()
      /xxx/tmp/govaluate/EvaluableExpression.go:48 +0x94
  github.com/casbin/govaluate.TestB()
      /xxx/tmp/govaluate/EvaluableExpression_test.go:18 +0x34
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x184
  testing.(*T).Run.gowrap1()
      /usr/local/go/src/testing/testing.go:1743 +0x40

Goroutine 6 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1743 +0x5e0
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:2168 +0x80
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x184
  testing.runTests()
      /usr/local/go/src/testing/testing.go:2166 +0x6e0
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:2034 +0xb74
  main.main()
      _testmain.go:151 +0x110

Goroutine 7 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:1743 +0x5e0
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:2168 +0x80
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1690 +0x184
  testing.runTests()
      /usr/local/go/src/testing/testing.go:2166 +0x6e0
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:2034 +0xb74
  main.main()
      _testmain.go:151 +0x110

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[hsluoyz]

@see-sharp-dev why close?