5 files changed, 23 insertions, 5 deletions
diff --git a/android/test/arch/build.gradle.kts b/android/test/arch/build.gradle.kts
index 085ad8d835..e84d725f87 100644
--- a/android/test/arch/build.gradle.kts
+++ b/android/test/arch/build.gradle.kts
@@ -17,7 +17,10 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
-    kotlinOptions { jvmTarget = Versions.jvmTarget }
+    kotlinOptions {
+        jvmTarget = Versions.jvmTarget
+        allWarningsAsErrors = true
+    }
 
     lint {
         lintConfig = file("${rootProject.projectDir}/config/lint.xml")
diff --git a/android/test/common/build.gradle.kts b/android/test/common/build.gradle.kts
index 31b8cfa67a..ebb719bbbd 100644
--- a/android/test/common/build.gradle.kts
+++ b/android/test/common/build.gradle.kts
@@ -16,7 +16,10 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
-    kotlinOptions { jvmTarget = Versions.jvmTarget }
+    kotlinOptions {
+        jvmTarget = Versions.jvmTarget
+        allWarningsAsErrors = true
+    }
 
     lint {
         lintConfig = file("${rootProject.projectDir}/config/lint.xml")
diff --git a/android/test/e2e/build.gradle.kts b/android/test/e2e/build.gradle.kts
index 8f4e9c2e0d..50224489d5 100644
--- a/android/test/e2e/build.gradle.kts
+++ b/android/test/e2e/build.gradle.kts
@@ -82,7 +82,10 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
-    kotlinOptions { jvmTarget = Versions.jvmTarget }
+    kotlinOptions {
+        jvmTarget = Versions.jvmTarget
+        allWarningsAsErrors = true
+    }
 
     lint {
         lintConfig = file("${rootProject.projectDir}/config/lint.xml")
diff --git a/android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/SimpleMullvadHttpClient.kt b/android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/SimpleMullvadHttpClient.kt
index 3373691923..5e702a2d80 100644
--- a/android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/SimpleMullvadHttpClient.kt
+++ b/android/test/e2e/src/main/kotlin/net/mullvad/mullvadvpn/test/e2e/misc/SimpleMullvadHttpClient.kt
@@ -187,7 +187,13 @@ class SimpleMullvadHttpClient(context: Context) {
     }
 
     operator fun <T> JSONArray.iterator(): Iterator<T> =
-        (0 until this.length()).asSequence().map { this.get(it) as T }.iterator()
+        (0 until length())
+            .asSequence()
+            .map {
+                @Suppress("UNCHECKED_CAST")
+                get(it) as T
+            }
+            .iterator()
 
     companion object {
         private const val REQUEST_ERROR_MESSAGE =
diff --git a/android/test/mockapi/build.gradle.kts b/android/test/mockapi/build.gradle.kts
index 5a571bd4fc..166a389553 100644
--- a/android/test/mockapi/build.gradle.kts
+++ b/android/test/mockapi/build.gradle.kts
@@ -38,7 +38,10 @@ android {
         targetCompatibility = JavaVersion.VERSION_17
     }
 
-    kotlinOptions { jvmTarget = Versions.jvmTarget }
+    kotlinOptions {
+        jvmTarget = Versions.jvmTarget
+        allWarningsAsErrors = true
+    }
 
     lint {
         lintConfig = file("${rootProject.projectDir}/config/lint.xml")