diff --git a/testing/src/main/java/org/oppia/android/testing/espresso/GenericViewMatchers.kt b/testing/src/main/java/org/oppia/android/testing/espresso/GenericViewMatchers.kt
index ea1f8b15de4..efbb360d967 100644
--- a/testing/src/main/java/org/oppia/android/testing/espresso/GenericViewMatchers.kt
+++ b/testing/src/main/java/org/oppia/android/testing/espresso/GenericViewMatchers.kt
@@ -1,7 +1,9 @@
 package org.oppia.android.testing.espresso
 
 import android.graphics.drawable.GradientDrawable
+import android.os.Build
 import android.view.View
+import androidx.annotation.RequiresApi
 import org.hamcrest.Description
 import org.hamcrest.Matcher
 import org.hamcrest.TypeSafeMatcher
@@ -19,6 +21,7 @@ class GenericViewMatchers {
      * Returns a [Matcher] that verifies a view has a fully opaque background. The view is expected
      * to have a [GradientDrawable] background.
      */
+    @RequiresApi(Build.VERSION_CODES.N)
     fun withOpaqueBackground(): Matcher<View> = withColorBackgroundMatching(
       descriptionSuffix = "an opaque background"
     ) { color -> color?.extractAlpha() == 0xff }
@@ -27,6 +30,7 @@ class GenericViewMatchers {
      * Returns a [Matcher] with the specified description suffix and color matcher, matching against
      * filled background colors of views.
      */
+    @RequiresApi(Build.VERSION_CODES.N)
     private fun withColorBackgroundMatching(
       @Suppress("SameParameterValue") descriptionSuffix: String,
       colorMatcher: (Long?) -> Boolean
diff --git a/testing/src/main/java/org/oppia/android/testing/junit/OppiaParameterizedTestRunner.kt b/testing/src/main/java/org/oppia/android/testing/junit/OppiaParameterizedTestRunner.kt
index 4dd7b3427c7..ae5e3e5f55c 100644
--- a/testing/src/main/java/org/oppia/android/testing/junit/OppiaParameterizedTestRunner.kt
+++ b/testing/src/main/java/org/oppia/android/testing/junit/OppiaParameterizedTestRunner.kt
@@ -1,5 +1,7 @@
 package org.oppia.android.testing.junit
 
+import android.os.Build
+import androidx.annotation.RequiresApi
 import org.junit.runner.Description
 import org.junit.runner.Runner
 import org.junit.runner.manipulation.Filter
@@ -76,6 +78,7 @@ import kotlin.reflect.KClass
  * contain (thus they should be treated as undefined outside of tests that specific define their
  * value via [Iteration]).
  */
+@RequiresApi(Build.VERSION_CODES.N)
 class OppiaParameterizedTestRunner(private val testClass: Class<*>) : Suite(testClass, listOf()) {
   private val parameterizedMethods = computeParameterizedMethods()
   private val selectedRunnerClass by lazy { fetchSelectedRunnerPlatformClass() }
@@ -95,6 +98,7 @@ class OppiaParameterizedTestRunner(private val testClass: Class<*>) : Suite(test
 
   override fun getChildren(): MutableList<Runner> = childrenRunners.toMutableList()
 
+  @RequiresApi(Build.VERSION_CODES.N)
   private fun computeParameterizedMethods(): Map<String, ParameterizedMethod> {
     val fieldsAndParsers = fetchParameterizedFields().map { field ->
       val valueParser = ParameterValue.createParserForField(field)
@@ -184,12 +188,14 @@ class OppiaParameterizedTestRunner(private val testClass: Class<*>) : Suite(test
     }.associateBy { it.methodName }
   }
 
+  @RequiresApi(Build.VERSION_CODES.N)
   private fun fetchParameterizedFields(): List<Field> {
     return testClass.declaredFields.mapNotNull { field ->
       field.getDeclaredAnnotation(Parameter::class.java)?.let { field }
     }
   }
 
+  @RequiresApi(Build.VERSION_CODES.N)
   private fun fetchParameterizedMethodDeclarations(): List<ParameterizedMethodDeclaration> {
     return testClass.declaredMethods.mapNotNull { method ->
       method.getDeclaredAnnotationsByType(Iteration::class.java).map { parameters ->
@@ -208,6 +214,7 @@ class OppiaParameterizedTestRunner(private val testClass: Class<*>) : Suite(test
     }
   }
 
+  @RequiresApi(Build.VERSION_CODES.N)
   private fun fetchSelectedRunnerPlatformClass(): Class<*> {
     return checkNotNull(testClass.getDeclaredAnnotation(SelectRunnerPlatform::class.java)) {
       "All suites using OppiaParameterizedTestRunner must declare their base platform runner" +
diff --git a/testing/src/main/java/org/oppia/android/testing/threading/TestCoroutineDispatchersRobolectricImpl.kt b/testing/src/main/java/org/oppia/android/testing/threading/TestCoroutineDispatchersRobolectricImpl.kt
index 3c93d9065bd..2f27175670b 100644
--- a/testing/src/main/java/org/oppia/android/testing/threading/TestCoroutineDispatchersRobolectricImpl.kt
+++ b/testing/src/main/java/org/oppia/android/testing/threading/TestCoroutineDispatchersRobolectricImpl.kt
@@ -1,5 +1,7 @@
 package org.oppia.android.testing.threading
 
+import android.os.Build
+import androidx.annotation.RequiresApi
 import org.oppia.android.testing.time.FakeSystemClock
 import java.lang.reflect.Method
 import java.time.Duration
@@ -34,6 +36,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
     } while (hasPendingCompletableTasks())
   }
 
+  @RequiresApi(Build.VERSION_CODES.O)
   override fun advanceTimeBy(delayTimeMillis: Long) {
     var remainingDelayMillis = delayTimeMillis
     while (remainingDelayMillis > 0) {
@@ -49,6 +52,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
     }
   }
 
+  @RequiresApi(Build.VERSION_CODES.O)
   override fun advanceUntilIdle() {
     // First, run through all tasks that are currently pending and can be run immediately.
     runCurrent()
@@ -67,6 +71,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
     }
   }
 
+  @RequiresApi(Build.VERSION_CODES.O)
   private fun advanceToNextFutureTask(
     currentTimeMillis: Long,
     maxDelayMs: Long = Long.MAX_VALUE
@@ -94,6 +99,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
   }
 
   /** Returns whether any of the dispatchers have any tasks to run, including in the future. */
+  @RequiresApi(Build.VERSION_CODES.O)
   private fun hasPendingTasks(): Boolean {
     return backgroundTestDispatcher.hasPendingTasks() ||
       blockingTestDispatcher.hasPendingTasks() ||
@@ -107,6 +113,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
       !uiTaskCoordinator.isIdle()
   }
 
+  @RequiresApi(Build.VERSION_CODES.O)
   private fun getNextFutureTaskTimeMillis(timeMillis: Long): Long? {
     val nextBackgroundFutureTaskTimeMills =
       backgroundTestDispatcher.getNextFutureTaskCompletionTimeMillis(timeMillis)
@@ -120,6 +127,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
     return futureTimes.firstOrNull()
   }
 
+  @RequiresApi(Build.VERSION_CODES.O)
   private fun getNextUiThreadFutureTaskTimeMillis(timeMillis: Long): Long? {
     return uiTaskCoordinator.getNextUiThreadFutureTaskTimeMillis(timeMillis)
   }
@@ -139,6 +147,7 @@ class TestCoroutineDispatchersRobolectricImpl @Inject constructor(
       idleMethod.invoke(shadowUiLooper)
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
     fun getNextUiThreadFutureTaskTimeMillis(timeMillis: Long): Long? {
       val nextScheduledTime = nextScheduledTimeMethod.invoke(shadowUiLooper) as Duration
       val delayMs = nextScheduledTime.toMillis()