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main_test.go
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main_test.go
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package main
//type Test struct {
// Args []string
// Input string
// ExpOutput string
// ExpErrout string
// ExpExitCode int
//}
//
//func RunTest(t *testing.T, test Test) {
// origArgs := os.Args
// origStdin := stdin
// origStdout := stdout
// origStderr := stderr
// origExitFunc := exitFunc
// defer func() {
// os.Args = origArgs
// stdin = origStdin
// stdout = origStdout
// stderr = origStderr
// exitFunc = origExitFunc
// }()
// os.Args = append([]string{os.Args[0]}, test.Args...)
// stdin = strings.NewReader(test.Input)
// stdout = &strings.Builder{}
// stderr = &strings.Builder{}
// var exitCode int
// exitFunc = func(code int) {
// exitCode = code
// }
//
// // Unfortunately the flag library may leave these set to a previous value, so we need to zero them out
// separator = ""
// useTabSeparator = false
// ignoreHeaderRow = false
//
// main()
// assert.Equal(t, test.ExpOutput, stdout.(*strings.Builder).String())
// assert.Equal(t, test.ExpErrout, stderr.(*strings.Builder).String())
// assert.Equal(t, test.ExpExitCode, exitCode)
//}
//
//func TestBasic(t *testing.T) {
// RunTest(t, Test{Args: []string{"1"}, Input: "a b c\nd e f\n", ExpOutput: "a\nd\n"})
//}
//
//func TestBasicNoNewline(t *testing.T) {
// RunTest(t, Test{Args: []string{"1"}, Input: "a b c\nd e f", ExpOutput: "a\nd\n"})
//}
//
//func TestBasic2Columns(t *testing.T) {
// RunTest(t, Test{Args: []string{"1", "3"}, Input: "a b c d\nd e f g", ExpOutput: "a\tc\nd\tf\n"})
//}
//
//func TestExtraColumns(t *testing.T) {
// RunTest(t, Test{Args: []string{"1", "2", "3"}, Input: "a b\nd e", ExpOutput: "a\tb\nd\te\n"})
//}
//
//func TestTabSpacesMix(t *testing.T) {
// RunTest(t, Test{Args: []string{"1"}, Input: "a b c\nd e f", ExpOutput: "a\nd\n"})
//}
//
//func TestInvalidColumn(t *testing.T) {
// RunTest(t, Test{Args: []string{"nan"}, Input: "a\t b \n e\tf",
// ExpErrout: "ERROR: failed to parse argument \"nan\": strconv.ParseInt: parsing \"nan\": invalid syntax\n",
// ExpExitCode: 1})
//}
//
//func TestTabSeparatorBasic(t *testing.T) {
// RunTest(t, Test{Args: []string{"-t", "2"}, Input: "a\t b \n e\tf", ExpOutput: " b \nf\n"})
//}
//
//func TestIgnoreHeaderRow(t *testing.T) {
// RunTest(t, Test{Args: []string{"-i", "2"}, Input: "a\tb\ne\tf", ExpOutput: "f\n"})
//}