Add instruction to put the device into test harness to error message
Bug: 267601529
Test: Run a test while not in test harness mode.
Change-Id: I8089503e61831e5dde6f4e659e92a8d75ea18e2b
diff --git a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
index ae9ba67..2d1c963 100644
--- a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
+++ b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
@@ -242,7 +242,8 @@
// Launcher should run in test harness so that custom accessibility protocol between
// Launcher and TAPL is enabled. In-process tests enable this protocol with a direct call
// into Launcher.
- assertTrue("Device must run in a test harness",
+ assertTrue("Device must run in a test harness. "
+ + "Run `adb shell setprop ro.test_harness 1` to enable it.",
TestHelpers.isInLauncherProcess() || ActivityManager.isRunningInTestHarness());
final String testPackage = getContext().getPackageName();