Fixes tox.ini targets (#5)

The format and lint tox targets are incomplete. This will make it in
line with the other rocks.

tests/tox.ini

@@ -15,22 +15,24 @@ pass_env =
 description = Apply coding style standards to code
 deps = -r {tox_root}/requirements-dev.txt
 commands =
-    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}
-    isort {tox_root} --profile=black
-    black {tox_root}
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/sanity
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/integration
+    isort {tox_root}/sanity {tox_root}/integration --profile=black
+    black {tox_root}/sanity {tox_root}/integration
 
 [testenv:lint]
 description = Check code against coding style standards
 deps = -r {tox_root}/requirements-dev.txt
 commands =
-    codespell {tox_root} --skip=".tox"
-    flake8 {tox_root}
-    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root} --dry
-    isort {tox_root} --profile=black --check
-    black {tox_root} --check --diff
+    codespell {tox_root}/sanity {tox_root}/integration
+    flake8 {tox_root}/sanity {tox_root}/integration
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/sanity --dry
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/integration --dry
+    isort {tox_root}/sanity {tox_root}/integration --profile=black --check
+    black {tox_root}/sanity {tox_root}/integration --check --diff
 
 [testenv:sanity]
-description = Run integration tests
+description = Run sanity tests
 deps =
     -r {tox_root}/requirements-test.txt
 commands =
@@ -63,10 +65,11 @@ pass_env =
     ROCK_*
     BUILT_ROCKS_METADATA
 
-
 [flake8]
 max-line-length = 120
 select = E,W,F,C,N
-ignore = W503
+# E231: missing whitespace after ':'
+# E231 excluded for false positives in strings and fstrings.
+ignore = W503,E231
 exclude = venv,.git,.tox,.tox_env,.venv,build,dist,*.egg_info
 show-source = true