For #21776 - Local 'var' is never modified and can be declared as 'val'

app/src/test/java/org/mozilla/fenix/ext/HomeFragmentStateTest.kt

@@ -140,7 +140,7 @@ class HomeFragmentStateTest {
 
     @Test
     fun `GIVEN a category is selected WHEN getFilteredStoriesCount is called for more stories than in this category THEN return only that`() {
-        var result = getFilteredStoriesCount(listOf(otherStoriesCategory), 4)
+        val result = getFilteredStoriesCount(listOf(otherStoriesCategory), 4)
         assertEquals(1, result.keys.size)
         assertEquals(otherStoriesCategory.name, result.entries.first().key)
         assertEquals(3, result[otherStoriesCategory.name])

app/src/test/java/org/mozilla/fenix/ext/ListTest.kt

@@ -17,8 +17,8 @@ class ListTest {
         val filePath1 = "filepath.txt"
         val filePath3 = "filepath3.txt"
 
-        var file1 = File(filePath1)
-        var file3 = File(filePath3)
+        val file1 = File(filePath1)
+        val file3 = File(filePath3)
 
         // Create files
         file1.createNewFile()
@@ -70,9 +70,9 @@ class ListTest {
         val filePath2 = "filepath.txt"
         val filePath3 = "filepath3.txt"
 
-        var file1 = File(filePath1)
-        var file2 = File(filePath2)
-        var file3 = File(filePath3)
+        val file1 = File(filePath1)
+        val file2 = File(filePath2)
+        val file3 = File(filePath3)
 
         // Create files
         file1.createNewFile()