It looks like you're testing a top level command. You might want to
consider using the testscript package, which provides a very concise way of
end-to-end testing this kind of thing.
e.g.
mycommand -h
cmp stdout expect-stdout
-- expect-stdout --
Expected output
See https://pkg.go.dev/github.com/rogpeppe/go-internal/testscript for more
details.
On Tue, 20 Oct 2020 at 05:02, Amit Saha <amitsaha...@gmail.com> wrote:
> Hi all, Consider the following test configuration:
>
>
> func TestHandleCommand(t *testing.T) {
>
> type expectedResult struct {
> output string
> err error
> }
> type testConfig struct {
> args []string
> result expectedResult
> }
>
> testConfigs := []testConfig{
> testConfig{
> args: []string{"-h"},
> result: expectedResult{
> err: nil,
> output: `Expected output`,
> },
> },
> }
>
> Then, I do this:
>
>
> for _, tc := range testConfigs {
> byteBuf := new(bytes.Buffer)
> w := bufio.NewWriter(byteBuf)
>
> err := handleCommand(w, tc.args)
> if tc.result.err == nil && err != nil {
> t.Errorf("Expected nil error, got %v", err)
> }
>
> if tc.result.err != nil && err.Error() != tc.result.err.Error() {
> t.Errorf("Expected error %v, got %v", tc.result.err, err)
> }
>
> if len(tc.result.output) != 0 {
> w.Flush()
> gotOutput := byteBuf.String()
> if tc.result.output != gotOutput {
> t.Errorf("Expected output to be: %v, Got: %v",
> tc.result.output, gotOutput)
> }
> }
> }
> }
>
> The above pattern works for me since the function may return an error
> and/or it may have something it writes to the provided writer, w.
>
> Is there a more concise way to write this?
>
>
>
> Thanks,
> Amit.
>
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> .
>
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