Remove dead code in tests.
# [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=h1) Report
> Merging [#2045](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=desc) into [master](https://codecov.io/gh/huggingface/transformers/commit/7edb51f3a516ca533797fb2bb2f2b7ce86e0df70?src=pr&el=desc) will **increase** coverage by `0.58%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/huggingface/transformers/pull/2045/graphs/tree.svg?width=650&token=9qOlN6Hb1c&height=150&src=pr)](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master    #2045      +/-   ##
==========================================
+ Coverage   83.45%   84.04%   +0.58%     
==========================================
  Files         105      105              
  Lines       15568    15544      -24     
==========================================
+ Hits        12993    13064      +71     
+ Misses       2575     2480      -95
```


| [Impacted Files](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [transformers/tests/modeling\_tf\_common\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX3RmX2NvbW1vbl90ZXN0LnB5) | `96.92% <ø> (+1.77%)` | :arrow_up: |
| [transformers/tokenization\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rva2VuaXphdGlvbl91dGlscy5weQ==) | `91.91% <0%> (+0.03%)` | :arrow_up: |
| [transformers/tests/modeling\_common\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX2NvbW1vbl90ZXN0LnB5) | `74.23% <0%> (+0.19%)` | :arrow_up: |
| [transformers/tests/modeling\_bert\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX2JlcnRfdGVzdC5weQ==) | `96.5% <0%> (+0.5%)` | :arrow_up: |
| [transformers/file\_utils.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL2ZpbGVfdXRpbHMucHk=) | `70.5% <0%> (+0.5%)` | :arrow_up: |
| [transformers/tests/modeling\_xlnet\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX3hsbmV0X3Rlc3QucHk=) | `96.12% <0%> (+0.64%)` | :arrow_up: |
| [transformers/tests/modeling\_xlm\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX3hsbV90ZXN0LnB5) | `96% <0%> (+0.66%)` | :arrow_up: |
| [transformers/tests/modeling\_roberta\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX3JvYmVydGFfdGVzdC5weQ==) | `75.38% <0%> (+0.76%)` | :arrow_up: |
| [transformers/tests/modeling\_distilbert\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX2Rpc3RpbGJlcnRfdGVzdC5weQ==) | `99.18% <0%> (+0.81%)` | :arrow_up: |
| [transformers/tests/modeling\_albert\_test.py](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree#diff-dHJhbnNmb3JtZXJzL3Rlc3RzL21vZGVsaW5nX2FsYmVydF90ZXN0LnB5) | `95.08% <0%> (+0.81%)` | :arrow_up: |
| ... and [15 more](https://codecov.io/gh/huggingface/transformers/pull/2045/diff?src=pr&el=tree-more) | |

------

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> Powered by [Codecov](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=footer). Last update [7edb51f...40255ab](https://codecov.io/gh/huggingface/transformers/pull/2045?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
<|||||>Yes, thanks @aaugustin!