tox updates: run py38, combine coverage, dist-as-dir

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py37,security,lint
+envlist = begin,py37,py38,coverage,security,lint,bundle
 
 [testenv]
 # build a wheel and test it
@@ -12,7 +12,7 @@ wheel = true
 wheel_build_env = build
 
 # whitelist commands we need
-whitelist_externals = ln
+whitelist_externals = cp
 
 # install everything via requirements-dev.txt, so that developer environment
 # is the same as the tox environment (for ease of use/no weird gotchas in
@@ -26,12 +26,26 @@ deps =
 # require setuptools when building
 deps = setuptools
 
+[testenv:begin]
+# clean up potential previous coverage runs
+skip_install = true
+commands = coverage erase
+
 [testenv:py37]
 # run pytest with coverage
 commands =
-    pytest --cov={envsitepackagesdir}/incorporealcms/ \
-           --cov-report=term-missing --cov-branch --cov-fail-under=95
-    ln -sf {distdir} .
+    pytest --cov-append --cov={envsitepackagesdir}/incorporealcms/ --cov-branch
+
+[testenv:py38]
+# run pytest with coverage
+commands =
+    pytest --cov-append --cov={envsitepackagesdir}/incorporealcms/ --cov-branch
+
+[testenv:coverage]
+# report on coverage runs from above
+skip_install = true
+commands =
+    coverage report --fail-under=95 --show-missing
 
 [testenv:security]
 # run security checks
@@ -44,7 +58,13 @@ commands =
 # run style checks
 commands =
     flake8
-    - flake8 --disable-noqa --ignore= --select=E,W,F,C,D,A,G,B,I,T,DUO
+    - flake8 --disable-noqa --ignore= --select=E,W,F,C,D,A,G,B,I,T,M,DUO
+
+[testenv:bundle]
+# take extra actions (build sdist, sphinx, whatever) to completely package the app
+commands =
+    cp -r {distdir} .
+    python setup.py sdist
 
 [coverage:paths]
 source =
@@ -64,7 +84,7 @@ omit =
     **/_version.py
 
 [flake8]
-enable-extensions = G
+enable-extensions = G,M
 exclude =
     .tox/
     versioneer.py