Add PreloadFragmentTest class to verify fragment preload functionality

app/src/main/java/com/trendyol/medusa/SamplePreloadFragment.kt

@@ -1,7 +1,6 @@
 package com.trendyol.medusa
 
 import android.os.Bundle
-import android.os.CountDownTimer
 import android.os.SystemClock
 import android.view.LayoutInflater
 import android.view.View

medusalib/src/androidTest/java/com/trendyol/medusalib/navigator/PreloadFragmentTest.kt

@@ -0,0 +1,93 @@
+package com.trendyol.medusalib.navigator
+
+import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.lifecycle.Lifecycle
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth
+import com.trendyol.medusalib.TestChildFragment
+import com.trendyol.medusalib.TestParentWithNavigatorFragment
+import com.trendyol.medusalib.navigator.controller.PreloadedFragmentResult
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class PreloadFragmentTest {
+
+    @Test
+    fun testPreloadFragment() {
+        val scenario = launchFragmentInContainer<TestParentWithNavigatorFragment>()
+        scenario.moveToState(Lifecycle.State.RESUMED)
+
+        scenario.onFragment { parentFragment ->
+            val navigator = parentFragment.navigator
+
+            val fragmentTag = "preloaded_test_fragment"
+            val testChildFragment = TestChildFragment.newInstance("Preload Fragment")
+
+            navigator.preloadFragment(testChildFragment, fragmentTag)
+            parentFragment.childFragmentManager.executePendingTransactions()
+
+            val preloadedFragment = parentFragment.childFragmentManager.findFragmentByTag(fragmentTag)
+            Truth.assertThat(preloadedFragment).isNotNull()
+            Truth.assertThat(preloadedFragment?.isVisible).isFalse()
+        }
+    }
+
+    @Test
+    fun testStartPreloadedFragment() {
+        val scenario = launchFragmentInContainer<TestParentWithNavigatorFragment>()
+        scenario.moveToState(Lifecycle.State.RESUMED)
+        scenario.onFragment { parentFragment ->
+            val fragmentTag = "preloaded_test_fragment"
+            val navigator = parentFragment.navigator
+            val testChildFragment = TestChildFragment.newInstance("Preload Fragment")
+
+            navigator.preloadFragment(testChildFragment, fragmentTag)
+            parentFragment.childFragmentManager.executePendingTransactions()
+
+            val result = navigator.startPreloadFragment(null, fragmentTag)
+            parentFragment.childFragmentManager.executePendingTransactions()
+
+            Truth.assertThat(result).isEqualTo(PreloadedFragmentResult.Success)
+            val startedFragment = parentFragment.childFragmentManager.findFragmentByTag(fragmentTag)
+            Truth.assertThat(startedFragment).isNotNull()
+            Truth.assertThat(startedFragment?.isVisible).isTrue()
+        }
+    }
+
+    @Test
+    fun testStartPreloadedFragmentWithFallback() {
+        val scenario = launchFragmentInContainer<TestParentWithNavigatorFragment>()
+        scenario.moveToState(Lifecycle.State.RESUMED)
+        scenario.onFragment { parentFragment ->
+            val fragmentTag = "non_existent_fragment"
+            val navigator = parentFragment.navigator
+            val fallbackFragment = TestChildFragment.newInstance("Fallback Fragment")
+
+            val result = navigator.startPreloadFragment(fallbackFragment, fragmentTag)
+            parentFragment.childFragmentManager.executePendingTransactions()
+
+            val startedFragment = parentFragment.childFragmentManager.findFragmentByTag(fragmentTag)
+            Truth.assertThat(result).isEqualTo(PreloadedFragmentResult.FallbackSuccess)
+            Truth.assertThat(startedFragment).isNotNull()
+            Truth.assertThat(startedFragment?.isVisible).isTrue()
+        }
+    }
+
+    @Test
+    fun testStartPreloadedFragmentNotFound() {
+        val scenario = launchFragmentInContainer<TestParentWithNavigatorFragment>()
+        scenario.moveToState(Lifecycle.State.RESUMED)
+        scenario.onFragment { parentFragment ->
+            val fragmentTag = "non_existent_fragment"
+            val navigator = parentFragment.navigator
+
+            val result = navigator.startPreloadFragment(null, fragmentTag)
+            parentFragment.childFragmentManager.executePendingTransactions()
+
+            val fragment = parentFragment.childFragmentManager.findFragmentByTag(fragmentTag)
+            Truth.assertThat(result).isEqualTo(PreloadedFragmentResult.NotFound)
+            Truth.assertThat(fragment).isNull()
+        }
+    }
+}