Fixing tests

PiPSampleActivityTest_No_PiP

@@ -0,0 +1,64 @@
+package com.example.android.pip
+
+import android.view.View
+import android.widget.TextView
+import androidx.test.core.app.ActivityScenario.launch
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.LargeTest
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+@LargeTest
+class PiPSampleActivityTest {
+
+    /**
+     * Verifies that the timer starts and updates the time.
+     */
+    @Test
+    fun startTimer_updatesTime() {
+        val scenario = launch(PiPSampleActivity::class.java)
+
+        scenario.onActivity { activity ->
+            val startBtn = activity.findViewById<View>(R.id.start_or_pause)
+            val timeText = activity.findViewById<TextView>(R.id.time)
+
+            // Initial state
+            assertThat(timeText.text.toString()).isEqualTo("00:00:00")
+
+            // Start timer
+            startBtn.performClick()
+        }
+
+        // Wait for async update
+        Thread.sleep(1500)
+
+        scenario.onActivity { activity ->
+            val timeText = activity.findViewById<TextView>(R.id.time)
+
+            // Time should now be updated
+            assertThat(timeText.text.toString()).isNotEqualTo("00:00:00")
+        }
+    }
+
+    /**
+     * Verifies that the Clear button resets the timer.
+     */
+    @Test
+    fun clearTimer_resetsTime() {
+        val scenario = launch(PiPSampleActivity::class.java)
+
+        scenario.onActivity { activity ->
+            val startBtn = activity.findViewById<View>(R.id.start_or_pause)
+            val clearBtn = activity.findViewById<View>(R.id.clear)
+            val timeText = activity.findViewById<TextView>(R.id.time)
+
+            startBtn.performClick()
+            clearBtn.performClick()
+
+            // Time should reset
+            assertThat(timeText.text.toString()).isEqualTo("00:00:00")
+        }
+    }
+}