Run tests at all levels

/reviewed-by @d-maurer 
/reviewed-on https://github.com/zopefoundation/ZEO/pull/210

.meta.toml

@@ -16,9 +16,9 @@ with-sphinx-doctests = false
 use-flake8 = true
 testenv-commands = [
     "# Run unit tests first.",
-    "zope-testrunner -u --test-path=src {posargs:-vc}",
+    "zope-testrunner -u --test-path=src -a 1000 {posargs:-vc}",
     "# Only run functional tests if unit tests pass.",
-    "zope-testrunner -f --test-path=src {posargs:-vc}",
+    "zope-testrunner -f --test-path=src -a 1000 {posargs:-vc}",
     ]
 testenv-deps = [
     "!zodbmaster: ZODB >= 4.2.0b1",

tox.ini

@@ -28,9 +28,9 @@ setenv =
     zeo4: ZEO4_SERVER=1
 commands =
     # Run unit tests first.
-    zope-testrunner -u --test-path=src {posargs:-vc}
+    zope-testrunner -u --test-path=src -a 1000 {posargs:-vc}
     # Only run functional tests if unit tests pass.
-    zope-testrunner -f --test-path=src {posargs:-vc}
+    zope-testrunner -f --test-path=src -a 1000 {posargs:-vc}
 extras =
     test