diff --git a/src/TulsiGenerator/XcodeProjectGenerator.swift b/src/TulsiGenerator/XcodeProjectGenerator.swift
index 9cc72a5..b4691b8 100644
--- a/src/TulsiGenerator/XcodeProjectGenerator.swift
+++ b/src/TulsiGenerator/XcodeProjectGenerator.swift
@@ -112,6 +112,9 @@
   /// write a stub value that will be the same regardless of the execution environment.
   var redactWorkspaceSymlink = false
 
+  /// Exposed for testing. Do not attempt to update/install files related to DBGShellCommands.
+  var suppressUpdatingShellCommands = false
+
   /// Exposed for testing. Do not modify user defaults.
   var suppressModifyingUserDefaults = false
 
@@ -1105,6 +1108,8 @@
 
   /// Install the latest bazel_cache_reader.
   private func updateShellCommands() throws {
+    guard !suppressUpdatingShellCommands else { return }
+
     // Construct a URL to ~/Library/Application Support/Tulsi/Scripts.
     let supportScriptsAbsoluteURL = fileManager.homeDirectoryForCurrentUser.appendingPathComponent(
       XcodeProjectGenerator.SupportScriptsPath, isDirectory: true)
diff --git a/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift b/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
index 8bca3c5..008a0b0 100644
--- a/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
+++ b/src/TulsiGeneratorIntegrationTests/EndToEndIntegrationTestCase.swift
@@ -243,8 +243,8 @@
     // Bazel built-in preprocessor defines are suppressed in order to prevent any
     // environment-dependent variables from mismatching the golden data.
     projectGenerator.xcodeProjectGenerator.suppressCompilerDefines = true
-    // Don't modify any user defaults.
-    projectGenerator.xcodeProjectGenerator.suppressModifyingUserDefaults = true
+    // Don't update shell command utilities.
+    projectGenerator.xcodeProjectGenerator.suppressUpdatingShellCommands = true
     // The username is forced to a known value.
     projectGenerator.xcodeProjectGenerator.usernameFetcher = { "_TEST_USER_" }
     // The workspace symlink is forced to a known value.