Pin `coverage` version in CI. (#1505)

Coverage 5.0.0 just appeared which appears to not work with pytest properly. This patch pins coverage to 4.5.4 which is a version which has worked successfully previously. Coverage 5.0.0 + pytest fails with: INTERNALERROR> coverage.misc.CoverageException: Couldn't use data file '/home/travis/build/Parsl/parsl/.coverage': UNIQUE constraint failed: meta.key when run when no .coverage file exists. Subsequent runs do not raise this error.
Parsl · Dec 16, 2019 · 4cc9b9430e59e99bb616dde02cd2365c0e741e71 · 4cc9b94
1 parent 4a726d1
commit 4cc9b9430e59e99bb616dde02cd2365c0e741e71
Unified Split

Showing with 1 addition and 1 deletion.

+1 −1 test-requirements.txt
diff --git a/test-requirements.txt b/test-requirements.txt
@@ -4,7 +4,7 @@ pytest>=4.6,<5
 pytest-cov
 pytest-xdist==1.26.1
 pytest-random-order
-coverage
+coverage==4.5.4
 mock>=1.0.0
 nbsphinx
 sphinx_rtd_theme