test: copy testlib common files into androidTest directly

we are unable to depend on them in androidTestImplementation terms
because android gradle plugin has a bug that breaks coverage with
a shared test/androidTest dep

we want the code to be truly shared though and just need to work around
the issue temporarily (we hope)

so a build-time copy seems the least-worst alternative

AnkiDroid/build.gradle

@@ -264,6 +264,15 @@ tasks.register('installGitHook', Copy) {
 // to run manually: `./gradlew installGitHook`
 tasks.named('preBuild').configure { dependsOn('installGitHook') }
 
+tasks.register('copyTestLibIntoAndroidTest', Copy) {
+    into new File(rootProject.rootDir, 'AnkiDroid/src/androidTest/java/com/ichi2/testutils')
+    from new File(rootProject.rootDir, 'testlib/src/main/java/com/ichi2/testutils')
+    into ('common') {
+        from 'common'
+    }
+}
+tasks.named('preBuild').configure { dependsOn('copyTestLibIntoAndroidTest') }
+
 // Issue 11078 - some emulators run, but run zero tests, and still report success
 tasks.register('assertNonzeroAndroidTests') {
     doLast {
@@ -408,7 +417,9 @@ dependencies {
     // for testing flows
     testImplementation libs.cashapp.turbine
 
-    androidTestImplementation project(':testlib')
+    // we should depend directly on the common testlib for androidTest, but we cannot
+    // until coverage-breaking issue is fixed https://issuetracker.google.com/issues/332746900
+    // androidTestImplementation project(':testlib')
 
     // May need a resolution strategy for support libs to our versions
     androidTestImplementation libs.androidx.espresso.core

AnkiDroid/src/androidTest/java/com/ichi2/testutils/common/.gitignore

@@ -0,0 +1,5 @@
+# The files in this directory are copied from testlib dynamically during build
+# Copy used instead of `androidTestImplementation(':testlib')` until android gradle plugin
+# issue that breaks coverage for shared test/androidTest deps is fixed
+# see https://issuetracker.google.com/issues/332746900#comment2
+*.kt

test-android-coverage.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Fixup build / test errors as needed
+#git cherry-pick 8a1c48d0ab2978d76e53774ff9b4e0ea2986cdfb --allow-empty  --no-commit --no-gpg-sign
+
+# Run the test
+./gradlew jacocoAndroidTestReport
+
+# Was there coverage?
+cat AnkiDroid/build/reports/jacoco/jacocoAndroidTestReport/jacocoAndroidTestReport.xml |grep 'covered="0"/></report>' > /dev/null
+if [ $? == 0 ]; then
+  echo no coverage detected
+  exit 1
+else
+  echo there appears to be coverage
+fi
+
+exit 0