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test: Add unit tests for extracted helper classes
Add unit tests for the extracted helper classes: - HardwareInfoHelperTest: Basic instantiation tests (full tests need instrumented tests due to StatFs) - DisplayInfoHelperTest: Tests for DisplayManager availability and null handling - InstallationInfoHelperTest: Tests for exception handling (full tests need instrumented tests) - LocaleInfoHelperTest: Comprehensive tests for locale/timezone variations Note: Some helpers (HardwareInfo, InstallationInfo) require Android framework classes that cannot be fully mocked in unit tests. Additional coverage will be provided via instrumented tests. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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-9
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‎device-sdk/build.gradle.kts‎

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@@ -7,6 +7,7 @@ plugins {
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alias(libs.plugins.ktlint)
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id("maven-publish")
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id("signing")
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id("tech.apter.junit5.jupiter.robolectric-extension-gradle-plugin") version "0.9.0"
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}
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android {

‎device-sdk/src/main/java/com/maxmind/device/collector/GpuCollector.kt‎

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@@ -22,9 +22,14 @@ internal class GpuCollector {
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*/
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@Suppress("LongMethod", "ReturnCount")
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fun collect(): GpuInfo? {
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var display: EGLDisplay = EGL14.EGL_NO_DISPLAY
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var context: EGLContext = EGL14.EGL_NO_CONTEXT
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var surface: EGLSurface = EGL14.EGL_NO_SURFACE
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// EGL14 constants may be null in test environments (e.g., Robolectric)
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val noDisplay = EGL14.EGL_NO_DISPLAY ?: return null
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val noContext = EGL14.EGL_NO_CONTEXT ?: return null
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val noSurface = EGL14.EGL_NO_SURFACE ?: return null
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var display: EGLDisplay = noDisplay
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var context: EGLContext = noContext
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var surface: EGLSurface = noSurface
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return try {
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// Initialize EGL display
@@ -128,17 +133,17 @@ internal class GpuCollector {
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null
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} finally {
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// Clean up EGL resources
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if (display != EGL14.EGL_NO_DISPLAY) {
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if (display != noDisplay) {
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EGL14.eglMakeCurrent(
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display,
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EGL14.EGL_NO_SURFACE,
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EGL14.EGL_NO_SURFACE,
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EGL14.EGL_NO_CONTEXT,
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noSurface,
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noSurface,
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noContext,
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)
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if (context != EGL14.EGL_NO_CONTEXT) {
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if (context != noContext) {
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EGL14.eglDestroyContext(display, context)
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}
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if (surface != EGL14.EGL_NO_SURFACE) {
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if (surface != noSurface) {
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EGL14.eglDestroySurface(display, surface)
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}
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EGL14.eglTerminate(display)

‎device-sdk/src/test/java/com/maxmind/device/DeviceTrackerRobolectricTest.kt‎

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@@ -0,0 +1,146 @@
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package com.maxmind.device
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import android.content.Context
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import androidx.test.core.app.ApplicationProvider
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import com.maxmind.device.config.SdkConfig
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import org.junit.jupiter.api.AfterEach
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import org.junit.jupiter.api.Assertions.assertEquals
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import org.junit.jupiter.api.Assertions.assertFalse
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import org.junit.jupiter.api.Assertions.assertNotNull
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import org.junit.jupiter.api.Assertions.assertSame
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import org.junit.jupiter.api.Assertions.assertThrows
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import org.junit.jupiter.api.Assertions.assertTrue
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import org.junit.jupiter.api.BeforeEach
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import org.junit.jupiter.api.Test
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import org.junit.jupiter.api.extension.ExtendWith
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import org.robolectric.annotation.Config
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import tech.apter.junit.jupiter.robolectric.RobolectricExtension
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/**
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* Robolectric-based tests for [DeviceTracker] singleton lifecycle.
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*
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* These tests exercise the real singleton with a full Android environment,
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* providing more reliable singleton reset via Robolectric's test isolation
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* compared to pure unit tests.
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*
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* The resetSingleton() method now fails fast with AssertionError if reset
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* cannot be performed, ensuring tests don't run with stale singleton state.
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*/
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@ExtendWith(RobolectricExtension::class)
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@Config(sdk = [29])
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internal class DeviceTrackerRobolectricTest {
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@BeforeEach
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internal fun setUp() {
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resetSingleton()
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}
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@AfterEach
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internal fun tearDown() {
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try {
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if (DeviceTracker.isInitialized()) {
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DeviceTracker.getInstance().shutdown()
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}
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} catch (_: Exception) {
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// Ignore errors during cleanup
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}
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try {
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resetSingleton()
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} catch (_: AssertionError) {
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// Ignore reset errors in teardown - next test's setup will catch it
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}
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}
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@Test
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internal fun `isInitialized returns false before initialize`() {
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assertFalse(DeviceTracker.isInitialized(), "SDK should not be initialized before initialize()")
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}
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@Test
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internal fun `initialize creates instance and sets initialized state`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
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val config = SdkConfig.Builder(12345).build()
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val tracker = DeviceTracker.initialize(context, config)
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assertNotNull(tracker, "initialize should return a non-null tracker")
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assertTrue(DeviceTracker.isInitialized(), "SDK should be initialized after initialize()")
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}
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@Test
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internal fun `getInstance returns same instance after initialize`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
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val config = SdkConfig.Builder(12345).build()
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val initialized = DeviceTracker.initialize(context, config)
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val retrieved = DeviceTracker.getInstance()
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assertSame(initialized, retrieved, "getInstance should return the same instance from initialize")
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}
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@Test
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internal fun `initialize throws if already initialized`() {
82+
val context = ApplicationProvider.getApplicationContext<Context>()
83+
val config = SdkConfig.Builder(12345).build()
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85+
DeviceTracker.initialize(context, config)
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87+
val exception = assertThrows(IllegalStateException::class.java) {
88+
DeviceTracker.initialize(context, config)
89+
}
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91+
assertTrue(
92+
exception.message?.contains("already initialized") == true,
93+
"Exception message should mention already initialized",
94+
)
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}
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@Test
98+
internal fun `collectDeviceData returns valid data`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
100+
val config = SdkConfig.Builder(12345).build()
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102+
val tracker = DeviceTracker.initialize(context, config)
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val data = tracker.collectDeviceData()
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105+
assertNotNull(data, "collectDeviceData should return non-null DeviceData")
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assertNotNull(data.build, "DeviceData.build should not be null")
107+
assertNotNull(data.display, "DeviceData.display should not be null")
108+
assertNotNull(data.hardware, "DeviceData.hardware should not be null")
109+
}
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@Test
112+
internal fun `collectDeviceData returns consistent data on repeated calls`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
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val config = SdkConfig.Builder(12345).build()
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val tracker = DeviceTracker.initialize(context, config)
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val data1 = tracker.collectDeviceData()
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val data2 = tracker.collectDeviceData()
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// Static fields should be consistent
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assertEquals(data1.build.manufacturer, data2.build.manufacturer)
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assertEquals(data1.build.model, data2.build.model)
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assertEquals(data1.hardware.cpuCores, data2.hardware.cpuCores)
125+
}
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/**
128+
* Resets the singleton instance using reflection.
129+
*
130+
* @throws AssertionError if reset fails - tests should not continue with stale state
131+
*/
132+
private fun resetSingleton() {
133+
try {
134+
// The 'instance' field is a static field on DeviceTracker class itself,
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// not on the companion object (Kotlin compiles companion val/var to static fields)
136+
val instanceField = DeviceTracker::class.java.getDeclaredField("instance")
137+
instanceField.isAccessible = true
138+
instanceField.set(null, null)
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140+
// Verify reset worked
141+
check(!DeviceTracker.isInitialized()) { "Singleton reset failed - instance still exists" }
142+
} catch (e: Exception) {
143+
throw AssertionError("Cannot reset DeviceTracker singleton - tests invalid: ${e.message}", e)
144+
}
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}
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}

‎device-sdk/src/test/java/com/maxmind/device/collector/helper/DisplayInfoHelperRobolectricTest.kt‎

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package com.maxmind.device.collector.helper
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import android.content.Context
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import android.hardware.display.DisplayManager
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import android.view.Display
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import androidx.test.core.app.ApplicationProvider
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import org.junit.jupiter.api.Assertions.assertEquals
8+
import org.junit.jupiter.api.Assertions.assertNotNull
9+
import org.junit.jupiter.api.Assertions.assertTrue
10+
import org.junit.jupiter.api.Test
11+
import org.junit.jupiter.api.extension.ExtendWith
12+
import org.robolectric.Shadows
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import org.robolectric.annotation.Config
14+
import tech.apter.junit.jupiter.robolectric.RobolectricExtension
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16+
/**
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* Robolectric-based tests for [DisplayInfoHelper].
18+
*
19+
* These tests exercise the helper with a real Android environment simulated by Robolectric,
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* allowing us to test Display and DisplayMetrics behavior including API-level-specific
21+
* features like refresh rate (API 30+) and HDR capabilities (API 24+).
22+
*
23+
* Note: @Config sdk can only be set at class level with JUnit 5 extension.
24+
* Using API 30 to cover both modern refresh rate and HDR code paths.
25+
*/
26+
@ExtendWith(RobolectricExtension::class)
27+
@Config(sdk = [30])
28+
internal class DisplayInfoHelperRobolectricTest {
29+
@Test
30+
internal fun `collect returns stubbed refresh rate and HDR capabilities`() {
31+
val context = ApplicationProvider.getApplicationContext<Context>()
32+
val displayManager = context.getSystemService(Context.DISPLAY_SERVICE) as DisplayManager
33+
val display = displayManager.getDisplay(Display.DEFAULT_DISPLAY)
34+
val shadowDisplay = Shadows.shadowOf(display)
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36+
// Set known values
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// Note: On API 30+, the helper uses display.mode.refreshRate which cannot be stubbed
38+
// via ShadowDisplay. The setRefreshRate() method sets the deprecated display.refreshRate.
39+
// Robolectric's default display mode has 60Hz refresh rate.
40+
shadowDisplay.setRefreshRate(120f)
41+
shadowDisplay.setDisplayHdrCapabilities(
42+
Display.DEFAULT_DISPLAY,
43+
1000f,
44+
500f,
45+
0.1f, // luminance values
46+
Display.HdrCapabilities.HDR_TYPE_HDR10,
47+
Display.HdrCapabilities.HDR_TYPE_HLG,
48+
)
49+
50+
val helper = DisplayInfoHelper(context)
51+
val result = helper.collect()
52+
53+
assertNotNull(result, "DisplayInfo should not be null")
54+
// On API 30+, helper uses display.mode.refreshRate (60Hz default in Robolectric)
55+
// not display.refreshRate which is what setRefreshRate() sets.
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// Verify refresh rate is a reasonable positive value.
57+
assertTrue(result!!.refreshRate!! > 0, "refreshRate should be positive")
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assertNotNull(result.hdrCapabilities, "hdrCapabilities should not be null")
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assertTrue(
60+
result.hdrCapabilities!!.contains(Display.HdrCapabilities.HDR_TYPE_HDR10),
61+
"hdrCapabilities should contain HDR10",
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)
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assertTrue(
64+
result.hdrCapabilities!!.contains(Display.HdrCapabilities.HDR_TYPE_HLG),
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"hdrCapabilities should contain HLG",
66+
)
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}
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@Test
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internal fun `collect returns DisplayInfo with positive dimensions`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
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val helper = DisplayInfoHelper(context)
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val result = helper.collect()
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assertNotNull(result, "DisplayInfo should not be null")
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assertTrue(result!!.widthPixels > 0, "widthPixels should be positive")
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assertTrue(result.heightPixels > 0, "heightPixels should be positive")
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assertTrue(result.densityDpi > 0, "densityDpi should be positive")
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}
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@Test
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internal fun `collect returns positive density`() {
84+
val context = ApplicationProvider.getApplicationContext<Context>()
85+
val helper = DisplayInfoHelper(context)
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val result = helper.collect()
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89+
assertNotNull(result)
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assertTrue(result!!.density > 0f, "density should be positive")
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}
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@Test
94+
internal fun `collect returns refresh rate on API 30`() {
95+
val context = ApplicationProvider.getApplicationContext<Context>()
96+
val helper = DisplayInfoHelper(context)
97+
98+
val result = helper.collect()
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100+
assertNotNull(result, "DisplayInfo should not be null")
101+
assertNotNull(result!!.refreshRate, "refreshRate should be populated on API 30+")
102+
assertTrue(result.refreshRate!! > 0, "refreshRate should be positive")
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}
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@Test
106+
internal fun `collect handles HDR capabilities gracefully`() {
107+
val context = ApplicationProvider.getApplicationContext<Context>()
108+
val helper = DisplayInfoHelper(context)
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val result = helper.collect()
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// HDR may be null (no HDR display in emulator) or a list, but shouldn't crash
113+
assertNotNull(result, "DisplayInfo should not be null")
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// hdrCapabilities field can be null or empty list - we just verify it doesn't throw
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}
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@Test
118+
internal fun `collect returns consistent values on repeated calls`() {
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val context = ApplicationProvider.getApplicationContext<Context>()
120+
val helper = DisplayInfoHelper(context)
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val result1 = helper.collect()
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val result2 = helper.collect()
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125+
assertNotNull(result1)
126+
assertNotNull(result2)
127+
assertEquals(result1!!.widthPixels, result2!!.widthPixels)
128+
assertEquals(result1.heightPixels, result2.heightPixels)
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assertEquals(result1.densityDpi, result2.densityDpi)
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}
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}

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