From 7656572172e45d3591d646075ac69e679f4a027c Mon Sep 17 00:00:00 2001
From: mcarare <48995920+mcarare@users.noreply.github.com>
Date: Mon, 22 Dec 2025 19:35:24 +0200
Subject: [PATCH] Add unit tests for `String.replace(Map<String, String>)`
 extension function.

---
 app/build.gradle                              |  2 +
 .../reference/browser/ext/StringKtTest.kt     | 45 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 app/src/test/java/org/mozilla/reference/browser/ext/StringKtTest.kt

diff --git a/app/build.gradle b/app/build.gradle
index 96fde11e6..12a7d2a0f 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -290,6 +290,8 @@ dependencies {
     implementation libs.mozilla.ui.tabcounter
     implementation libs.mozilla.ui.widgets
 
+    testImplementation libs.junit
+
     androidTestImplementation libs.androidx.test.espresso.core
     androidTestImplementation libs.androidx.test.espresso.idling.resources
     constraints {
diff --git a/app/src/test/java/org/mozilla/reference/browser/ext/StringKtTest.kt b/app/src/test/java/org/mozilla/reference/browser/ext/StringKtTest.kt
new file mode 100644
index 000000000..020ebb053
--- /dev/null
+++ b/app/src/test/java/org/mozilla/reference/browser/ext/StringKtTest.kt
@@ -0,0 +1,45 @@
+/* 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.reference.browser.ext
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class StringKtTest {
+    @Test
+    fun `replace should replace all keys with their corresponding values`() {
+        val input = "The quick brown fox jumps over the lazy dog"
+        val pairs = mapOf(
+            "quick" to "slow",
+            "brown" to "red",
+            "fox" to "cat",
+            "dog" to "mouse",
+        )
+
+        val result = input.replace(pairs)
+
+        assertEquals("The slow red cat jumps over the lazy mouse", result)
+    }
+
+    @Test
+    fun `replace should return the same string if the map is empty`() {
+        val input = "Hello world"
+        val pairs = emptyMap<String, String>()
+
+        val result = input.replace(pairs)
+
+        assertEquals(input, result)
+    }
+
+    @Test
+    fun `replace should handle keys that are not present in the string`() {
+        val input = "Hello world"
+        val pairs = mapOf("foo" to "bar")
+
+        val result = input.replace(pairs)
+
+        assertEquals("Hello world", result)
+    }
+}