Fixes #4543 - Language selection: Search (#4744)

* initial changes

* add search feature for selecting language

* add search feature for selecting language

* upload issue fix

* minor improvement

* added test and updated settings language selection ui

Co-authored-by: Pratham2305 <Pratham2305@users.noreply.github.com>

app/src/test/kotlin/fr/free/nrw/commons/upload/LanguagesAdapterTest.kt

@@ -0,0 +1,122 @@
+package fr.free.nrw.commons.upload
+
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.os.ConfigurationCompat
+import fr.free.nrw.commons.R
+import fr.free.nrw.commons.TestCommonsApplication
+import org.junit.Assert
+import org.junit.Before
+import org.junit.Test
+import org.junit.jupiter.api.Assertions
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.MockitoAnnotations
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.RuntimeEnvironment
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.LooperMode
+import org.wikipedia.language.AppLanguageLookUpTable
+import java.util.*
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [21], application = TestCommonsApplication::class)
+@LooperMode(LooperMode.Mode.PAUSED)
+class LanguagesAdapterTest {
+
+    private lateinit var context: Context
+
+    @Mock
+    private lateinit var selectedLanguages: HashMap<Integer, String>
+    @Mock
+    private lateinit var parent: ViewGroup
+
+    private lateinit var languageNamesList: List<String>
+    private lateinit var languageCodesList: List<String>
+    private lateinit var language: AppLanguageLookUpTable
+
+    private lateinit var languagesAdapter: LanguagesAdapter
+    private lateinit var convertView: View
+    private var selectLanguages: HashMap<Integer, String> = HashMap()
+
+    @Before
+    @Throws(Exception::class)
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        context = RuntimeEnvironment.application.applicationContext
+        language = AppLanguageLookUpTable(context)
+        convertView = LayoutInflater.from(context)
+            .inflate(R.layout.row_item_languages_spinner, null) as View
+
+        languageNamesList = language.localizedNames
+        languageCodesList = language.codes
+
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+    }
+
+    @Test
+    @Throws(Exception::class)
+    fun testOnGetView() {
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+        `when`(selectedLanguages.values).thenReturn(Collections.emptyList())
+        Assert.assertEquals(languagesAdapter.getView(0, convertView, parent), convertView)
+    }
+
+    @Test
+    fun testGetCount() {
+        Assertions.assertEquals(languageCodesList.size, languagesAdapter.count)
+    }
+
+    @Test
+    fun testGetLanguageCode() {
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+        Assertions.assertEquals(languagesAdapter.getLanguageCode(0), languageCodesList[0])
+    }
+
+    @Test
+    fun testGetIndexOfUserDefaultLocale() {
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+        Assertions.assertEquals(languageCodesList.indexOf(ConfigurationCompat.getLocales(context.resources.configuration)[0].language), languagesAdapter.getIndexOfUserDefaultLocale(context))
+    }
+
+    @Test
+    fun testSelectLanguageNotEmpty() {
+        selectLanguages[Integer(0)] = "es"
+        selectLanguages[Integer(1)] = "de"
+        languagesAdapter = LanguagesAdapter(context, selectLanguages)
+
+        Assertions.assertEquals(false, languagesAdapter.isEnabled(languagesAdapter.getIndexOfLanguageCode("es")))
+        Assertions.assertEquals(false, languagesAdapter.isEnabled(languagesAdapter.getIndexOfLanguageCode("de")))
+    }
+
+    @Test
+    fun testFilterEmpty() {
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+        languagesAdapter.filter.filter("")
+        Assertions.assertEquals(languageCodesList.size, languagesAdapter.count)
+    }
+
+    @Test
+    fun testFilterNonEmpty() {
+        languagesAdapter = LanguagesAdapter(context, selectedLanguages)
+        val constraint = "spa"
+        languagesAdapter.filter.filter(constraint)
+        val length: Int = languageNamesList.size
+        val defaultlanguagecode = languageCodesList.indexOf(ConfigurationCompat.getLocales(context.resources.configuration)[0].language)
+        var i = 0
+        var s = 0
+        while (i < length) {
+            val key: String = language.codes[i]
+            val value: String = language.localizedNames[i]
+            if(value.contains(constraint, true) || Locale(key).getDisplayName(
+                    Locale(language.codes[defaultlanguagecode])).contains(constraint, true))
+                s++
+            i++
+        }
+        Assertions.assertEquals(s, languagesAdapter.count)
+    }
+
+}