diff --git a/README.md b/README.md
index 27aa57b0..b1269253 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ parallel to your `flutter` repository checkout, then, from this
 directory, run:
 
 ```
-pushd ../flutter/dev/customer_testing && pub get && popd
+pushd ../flutter/dev/customer_testing && flutter pub get && popd
 ../flutter/bin/cache/dart-sdk/bin/dart ../flutter/dev/customer_testing/run_tests.dart --skip-template --verbose registry/*.test
 ```
 
diff --git a/registry/flutter_devtools.test b/registry/flutter_devtools.test
index faa03a1f..19fde689 100644
--- a/registry/flutter_devtools.test
+++ b/registry/flutter_devtools.test
@@ -5,7 +5,7 @@ contact=dart-devtools-eng@google.com
 fetch=git clone https://github.com/kenzieschmoll/devtools.git tests
 fetch=git -C tests checkout 0729b72c95993e88e57c991d250c0858ee329e78
 
-test.linux=./tool/refresh.sh >> output.txt
+setup.linux=./tool/refresh.sh >> output.txt
 
 update=packages/devtools_app
 update=packages/devtools_app_shared
@@ -14,7 +14,7 @@ update=packages/devtools_shared
 update=packages/devtools_test
 
 test.linux=./tool/flutter_customer_tests/analyze.sh
-#test.linux=./tool/flutter_customer_tests/flutter_customer_tests.sh
+test.linux=./tool/flutter_customer_tests/flutter_customer_tests.sh
 
 # Reduce number of iterations because these tests take longer than our recommended maximum.
 iterations=1
diff --git a/registry/template.test b/registry/template.test
index 6de745bc..c3db7445 100644
--- a/registry/template.test
+++ b/registry/template.test
@@ -63,6 +63,28 @@ contact=bar@example.com
 fetch=git clone https://github.com/USERNAME/REPOSITORY.git tests
 fetch=git -C tests checkout 0123456789abcdef0123456789abcdef01234567
 
+# The "setup" lines specify commands to run before the "update" or
+# "test" lines are handled. This is useful for things like generating
+# mocks before running the "update" and "test" steps.
+#
+# Commands specified using "setup=" must work identically on Windows,
+# macOS, and Linux. This generally means you want to limit yourself to
+# simple commands. For anything more elaborate, consider creating a
+# "setup.sh" shell script to run on macOS and Linux and a "setup.bat"
+# batch file to run on Windows (referencing it without the extension
+# here should mean that in runs the shell script on Unix systems and
+# the batch file on Windows, because of how Windows looks up commands).
+# On Windows, these commands are executed via
+# `CMD.EXE /S /C "command..."`.
+#
+# Alternatively, you can use a platform-specific test line:
+#   setup.windows= to run a command on Windows only.
+#   setup.macos= to run a command on MacOS only.
+#   setup.linux= to run a command on Linux only.
+#   setup.posix= to run a command on MacOS and Linux only.
+setup.posix=setup.sh
+setup.windows=setup.bat
+
 # The "update" lines specify paths (relative to the newly created
 # "tests" directory) in which to run a flutter command to
 # automatically update the code to fix breaking changes. The command