Add telemetry/test package

[MrAlias]

This package is used to verify the encode/decode of the telemetry pkg is compliant with pdata (i.e. OTLP). It is added as a separate module to isolate the pdata dependencies from telemetry which is explicitly designed to not include these dependencies.

[pellared]

How about adding TestJSONMarshalRoundtrip test (to avoid bugs like this open-telemetry/opentelemetry-go#1273) which does something like the following:

func TestJSONMarshalRoundtrip(t *testing.T) {
  data, err := json.Marshal(traces)
  require.NoError(t, err)

  var got telemetry.Traces
  err := json.Unmarshal(data, &got)
  require.NoError(t, err)

  assert.Equal(t, traces, got)
}

It could added to tests in telemetry package. However, adding it here is easier as we already have "testdata" in form or traces field.
This comment can be addressed in a separate PR.

[MrAlias]

How about adding TestJSONMarshalRoundtrip test which does something like the following:

func TestJSONMarshalRoundtrip(t *testing.T) {
  data, err := json.Marshal(traces)
  require.NoError(t, err)

  var got telemetry.Traces
  err := json.Unmarshal(data, &got)
  require.NoError(t, err)

  assert.Equal(t, traces, got)
}

It could added to tests in telemetry package. However, adding it here is easier as we already have "testdata" in form or traces field. This comment can be addressed in a separate PR.

I'm looking at adding this in a separate PR presently.

[pellared]

👍

[MrAlias]

How about adding TestJSONMarshalRoundtrip test which does something like the following:

func TestJSONMarshalRoundtrip(t *testing.T) {
  data, err := json.Marshal(traces)
  require.NoError(t, err)

  var got telemetry.Traces
  err := json.Unmarshal(data, &got)
  require.NoError(t, err)

  assert.Equal(t, traces, got)
}

It could added to tests in telemetry package. However, adding it here is easier as we already have "testdata" in form or traces field. This comment can be addressed in a separate PR.

I'm looking at adding this in a separate PR presently.

#1196