For #9698: Add unit tests for Context extension getStringWithArgSafe

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

@@ -0,0 +1,60 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.ext
+
+import android.content.Context
+import io.mockk.every
+import io.mockk.mockk
+import io.mockk.mockkObject
+import io.mockk.mockkStatic
+import mozilla.components.support.locale.LocaleManager
+import mozilla.components.support.locale.LocaleManager.getSystemDefault
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import java.lang.String.format
+import java.util.Locale
+
+class ContextTest {
+    private lateinit var context: Context
+    private val selectedLocale = Locale("ro", "RO")
+    private val appName = "Firefox Preview"
+    private val correctlyFormattedString = "Incearca noul %1s"
+    private val incorrectlyFormattedString = "Incearca noul %1&s"
+    private val englishString = "Try the new %1s"
+
+    private val mockId: Int = 11
+
+    @Before
+    fun setup() {
+        mockkStatic("org.mozilla.fenix.settings.advanced.LocaleManagerExtensionKt")
+        mockkObject(LocaleManager)
+        context = mockk(relaxed = true)
+        context.resources.configuration.setLocale(selectedLocale)
+
+        every { LocaleManager.getCurrentLocale(context) } returns selectedLocale
+    }
+
+    @Test
+    fun `getStringWithArgSafe returns selected locale for correct formatted string`() {
+        every { context.getString(mockId) } returns correctlyFormattedString
+
+        val result = context.getStringWithArgSafe(mockId, appName)
+
+        assertEquals("Incearca noul Firefox Preview", result)
+    }
+
+    @Test
+    fun `getStringWithArgSafe returns English locale for incorrect formatted string`() {
+
+        every { getSystemDefault() } returns Locale("en")
+        every { context.getString(mockId) } returns incorrectlyFormattedString
+        every { format(context.getString(mockId), appName) } returns format(englishString, appName)
+
+        val result = context.getStringWithArgSafe(mockId, appName)
+
+        assertEquals("Try the new Firefox Preview", result)
+    }
+}