add unit test for poisson

[enkilee]

PR types

Others

PR changes

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Describe

#378 3.6 poisson
add unit test for poisson

result:

aistudio@jupyter-115720-6409174:~/PaddleScience$ pytest --cov=./ppsci/equation/pde test/equation/test_poisson.py
========================================================================= test session starts ==========================================================================
platform linux -- Python 3.8.8, pytest-6.2.2, py-1.10.0, pluggy-0.13.1
rootdir: /home/aistudio/PaddleScience
plugins: anyio-3.7.0, cov-4.1.0
collected 2 items                                                                                                                                                      

test/equation/test_poisson.py ..                                                                                                                                 [100%]

----------- coverage: platform linux, python 3.8.8-final-0 -----------
Name                                      Stmts   Miss  Cover
-------------------------------------------------------------
ppsci/equation/pde/__init__.py                9      0   100%
ppsci/equation/pde/base.py                   26      6    77%
ppsci/equation/pde/biharmonic.py             17     13    24%
ppsci/equation/pde/laplace.py                15     11    27%
ppsci/equation/pde/linear_elasticity.py     155    149     4%
ppsci/equation/pde/navier_stokes.py          60     53    12%
ppsci/equation/pde/normal_dot_vec.py         13      9    31%
ppsci/equation/pde/poisson.py                13      0   100%
ppsci/equation/pde/viv.py                    20     13    35%
-------------------------------------------------------------
TOTAL                                       328    254    23%


========================================================================== 2 passed in 3.86s ===========================================================================

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[paddle-bot]

Thanks for your contribution!

[HydrogenSulfate]

另外在修改完之后，请贴上单测覆盖率达到100%的截图

[HydrogenSulfate]

提交代码之前请先在 PaddleScience 目录下安装 pre-commit

pip install pre-commit
pre-commit install

[enkilee]

提交代码之前请先在 PaddleScience 目录下安装 pre-commit

pip install pre-commit
pre-commit install

收到，我看了错误才发现要和PP一样装pre-commit，抱歉

[HydrogenSulfate]

LGTM

[HydrogenSulfate]

license/cla 好像卡住了，可以执行一下 git commit --allow-empty --amend，补一个空commit 再PR一下，重新触发cla认证

[enkilee]

收到

[enkilee]

搞不懂为什么cla一直不过，我重新提个试试看吧

[HydrogenSulfate]

搞不懂为什么cla一直不过，我重新提个试试看吧

看起来没有签署成功

[enkilee]

签了，签了N次。。。

[enkilee]

@HydrogenSulfate 佬，PR 400 cla成功，这个就不合入了啊。抱歉，麻烦您了

[HydrogenSulfate]

same as #400 , closed this PR.