Disable unnecessary Android instrumented tests

build-logic/convention/src/main/kotlin/AndroidLibraryConventionPlugin.kt

@@ -20,6 +20,7 @@ import com.google.samples.apps.nowinandroid.configureFlavors
 import com.google.samples.apps.nowinandroid.configureGradleManagedDevices
 import com.google.samples.apps.nowinandroid.configureKotlinAndroid
 import com.google.samples.apps.nowinandroid.configurePrintApksTask
+import com.google.samples.apps.nowinandroid.disableUnnecessaryAndroidTests
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.artifacts.VersionCatalogsExtension
@@ -44,6 +45,7 @@ class AndroidLibraryConventionPlugin : Plugin<Project> {
             }
             extensions.configure<LibraryAndroidComponentsExtension> {
                 configurePrintApksTask(this)
+                disableUnnecessaryAndroidTests(target)
             }
             val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")
             configurations.configureEach {

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/AndroidInstrumentedTests.kt

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+package com.google.samples.apps.nowinandroid
+
+import com.android.build.api.variant.LibraryAndroidComponentsExtension
+import org.gradle.api.Project
+
+/**
+ * Disable unnecessary Android instrumented tests for the [project] if there is no `androidTest` folder.
+ * Otherwise, these projects would be compiled, packaged, installed and ran only to end-up with the following message:
+ *
+ * > Starting 0 tests on AVD
+ *
+ * Note: this could be improved by checking other potential sourceSets based on buildTypes and flavors.
+ */
+internal fun LibraryAndroidComponentsExtension.disableUnnecessaryAndroidTests(
+    project: Project,
+) = beforeVariants {
+    it.enableAndroidTest = it.enableAndroidTest
+        && project.projectDir.resolve("src/androidTest").exists()
+}