New argument for tests: D, included exogenous variables

[mlondschien]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.11286% with 11 lines in your changes missing coverage. Please review.

Project coverage is 94.76%. Comparing base (fa32c3d) to head (9d354fb).
Report is 26 commits behind head on main.

Files with missing lines	Patch %	Lines
ivmodels/simulate.py	90.90%	2 Missing ⚠️
ivmodels/tests/lagrange_multiplier.py	93.75%	2 Missing ⚠️
ivmodels/tests/pulse.py	75.00%	2 Missing ⚠️
ivmodels/tests/utils.py	80.00%	2 Missing ⚠️
tests/tests/test_tests.py	97.43%	2 Missing ⚠️
ivmodels/tests/anderson_rubin.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   93.66%   94.76%   +1.09%     
==========================================
  Files          36       36              
  Lines        2005     2138     +133     
==========================================
+ Hits         1878     2026     +148     
+ Misses        127      112      -15     

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