diff --git a/.azure-pipelines/templates/jobs/standard-tests-jobs.yml b/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
index 53bc0b5dd..29afa2a98 100644
--- a/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
+++ b/.azure-pipelines/templates/jobs/standard-tests-jobs.yml
@@ -14,7 +14,7 @@ jobs:
         windows-py37:
           IMAGE_NAME: windows-2019
           PYTHON_VERSION: 3.7
-          TOXENV: py37-win
+          TOXENV: py-win
         windows-py39-cover:
           IMAGE_NAME: windows-2019
           PYTHON_VERSION: 3.9
diff --git a/tools/install_and_test.py b/tools/install_and_test.py
deleted file mode 100755
index 439e5dce3..000000000
--- a/tools/install_and_test.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env python
-# pip installs the requested packages in editable mode and runs unit tests on
-# them. Each package is installed and tested in the order they are provided
-# before the script moves on to the next package. Packages are installed using
-# pinned versions of all of our dependencies. See pip_install.py for more
-# information on the versions pinned to.
-import os
-import re
-import subprocess
-import sys
-
-
-def call_with_print(command):
-    print(command)
-    subprocess.check_call(command, shell=True)
-
-
-def main(args):
-    script_dir = os.path.dirname(os.path.abspath(__file__))
-    command = [sys.executable, os.path.join(script_dir, 'pip_install_editable.py')]
-
-    for requirement in args:
-        current_command = command[:]
-        current_command.append(requirement)
-        call_with_print(' '.join(current_command))
-        pkg = re.sub(r'\[\w+\]', '', requirement)
-
-        call_with_print(' '.join([
-            sys.executable, '-m', 'pytest', pkg]))
-
-if __name__ == '__main__':
-    main(sys.argv[1:])
diff --git a/tools/pip_install_editable.py b/tools/pip_install_editable.py
deleted file mode 100755
index 87be1b8f5..000000000
--- a/tools/pip_install_editable.py
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env python
-# pip installs packages in editable mode using pip_install.py
-import sys
-
-import pip_install
-
-
-def main(args):
-    new_args = []
-    for arg in args:
-        new_args.append('-e')
-        new_args.append(arg)
-
-    pip_install.main(new_args)
-
-if __name__ == '__main__':
-    main(sys.argv[1:])
diff --git a/tox.ini b/tox.ini
index 6a7d44969..8e8f78466 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,7 +46,7 @@ commands =
     echo "Unrecognized environment name {envname}"
     false
 
-[testenv:py]
+[testenv:py{,-win,-posix}]
 commands =
     python -m pytest {posargs} acme certbot certbot-apache certbot-dns-cloudflare certbot-dns-digitalocean certbot-dns-dnsimple certbot-dns-dnsmadeeasy certbot-dns-gehirn certbot-dns-google certbot-dns-linode certbot-dns-luadns certbot-dns-nsone certbot-dns-ovh certbot-dns-rfc2136 certbot-dns-route53 certbot-dns-sakuracloud certbot-nginx
 
@@ -79,6 +79,25 @@ deps =
     -e certbot-ci
 commands = mypy {[base]source_paths}
 
+[testenv:isolated-acme]
+description = Tests acme without any Certbot components installed
+deps = -e acme[test]
+commands = python -m pytest acme
+
+[testenv:isolated-certbot]
+description = Tests Certbot without any additional plugins installed
+deps =
+    {[testenv:isolated-acme]deps}
+    -e certbot[test]
+commands = python -m pytest certbot
+
+[testenv:isolated-plugin]
+description = Tests the given plugin without installing other plugins
+deps =
+    {[testenv:isolated-certbot]deps}
+    -e {posargs}
+commands = python -m pytest {posargs}
+
 [testenv:apacheconftest]
 deps =
     -e acme
@@ -139,7 +158,7 @@ passenv =
     DOCKER_*
 
 [testenv:docker_dev]
-description = tests the Dockerfile-dev file to ensure development with it works as expected
+description = Tests the Dockerfile-dev file to ensure development with it works as expected
 deps =
 commands =
     docker-compose run --rm --service-ports development bash -c 'tox -e lint'
@@ -230,7 +249,5 @@ passenv =
     AWS_*
 setenv = AWS_DEFAULT_REGION=us-east-1
 changedir = letstest
-# The package to install is in the current working directory because of the
-# value of changedir.
-deps = -e .
+deps = -e {toxinidir}/letstest
 commands = {toxinidir}/tools/retry.sh letstest targets/targets.yaml {env:AWS_EC2_PEM_FILE} SET_BY_ENV scripts/test_apache2.sh --repo {toxinidir}