Bug 1831083 - Refactor DefaultReaderModeController to improve testing.

app/src/main/java/org/mozilla/fenix/browser/readermode/ReaderModeController.kt

@@ -8,6 +8,7 @@ import android.view.View
 import android.widget.Button
 import android.widget.RadioButton
 import androidx.appcompat.content.res.AppCompatResources
+import com.google.android.gms.common.util.VisibleForTesting
 import mozilla.components.feature.readerview.ReaderViewFeature
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
 import org.mozilla.fenix.R
@@ -27,6 +28,21 @@ class DefaultReaderModeController(
     private val isPrivate: Boolean = false,
     private val onReaderModeChanged: () -> Unit = {},
 ) : ReaderModeController {
+
+    @VisibleForTesting
+    internal val privateButtonColor
+        get() = AppCompatResources.getColorStateList(
+            readerViewControlsBar.context,
+            R.color.readerview_private_button_color,
+        )
+
+    @VisibleForTesting
+    internal val privateRadioButtonColor
+        get() = AppCompatResources.getColorStateList(
+            readerViewControlsBar.context,
+            R.color.readerview_private_radio_color,
+        )
+
     override fun hideReaderView() {
         onReaderModeChanged()
         readerViewFeature.withFeature {
@@ -56,12 +72,7 @@ class DefaultReaderModeController(
         ).map {
             findViewById<Button>(it)
         }.forEach {
-            it.setTextColor(
-                AppCompatResources.getColorStateList(
-                    context,
-                    R.color.readerview_private_button_color,
-                ),
-            )
+            it.setTextColor(privateButtonColor)
         }
 
         listOf(
@@ -70,12 +81,7 @@ class DefaultReaderModeController(
         ).map {
             findViewById<RadioButton>(it)
         }.forEach {
-            it.setTextColor(
-                AppCompatResources.getColorStateList(
-                    context,
-                    R.color.readerview_private_radio_color,
-                ),
-            )
+            it.setTextColor(privateRadioButtonColor)
         }
     }
 }

app/src/test/java/org/mozilla/fenix/browser/readermode/DefaultReaderModeControllerTest.kt

@@ -99,12 +99,20 @@ class DefaultReaderModeControllerTest {
 
     @Test
     fun testShowControlsPrivateTab() {
-        val controller = DefaultReaderModeController(
-            featureWrapper,
-            readerViewControlsBar,
-            isPrivate = true,
+        val controller = spyk(
+            DefaultReaderModeController(
+                featureWrapper,
+                readerViewControlsBar,
+                isPrivate = true,
+            ),
         )
 
+        val privateButtonColor = mockk<ColorStateList>()
+        val privateRadioButtonColor = mockk<ColorStateList>()
+
+        every { controller.privateButtonColor } returns privateButtonColor
+        every { controller.privateRadioButtonColor } returns privateRadioButtonColor
+
         val decrease = mockk<Button>(relaxUnitFun = true)
         val increase = mockk<Button>(relaxUnitFun = true)
         val serif = mockk<RadioButton>(relaxUnitFun = true)
@@ -126,10 +134,10 @@ class DefaultReaderModeControllerTest {
         controller.showControls()
         verify { readerViewFeature.showControls() }
         verifyAll {
-            decrease.setTextColor(any<ColorStateList>())
-            increase.setTextColor(any<ColorStateList>())
-            serif.setTextColor(any<ColorStateList>())
-            sansSerif.setTextColor(any<ColorStateList>())
+            decrease.setTextColor(privateButtonColor)
+            increase.setTextColor(privateButtonColor)
+            serif.setTextColor(privateRadioButtonColor)
+            sansSerif.setTextColor(privateRadioButtonColor)
         }
     }
 }