fix codacy

Signed-off-by: alperozturk96 <alper_ozturk@proton.me>

Author: alperozturk96

core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/EcosystemManager.kt

@@ -38,12 +38,11 @@ class EcosystemManager(
         private const val PLAY_STORE_LINK = "https://play.google.com/store/apps/details?id="
         private const val PLAY_STORE_MARKET_LINK = "market://details?id="
         private const val EXTRA_KEY_ACCOUNT = "KEY_ACCOUNT"
+
+        const val ACCOUNT_NAME_PATTERN_REGEX = "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-z]{2,}"
     }
 
-    private val accountNamePattern =
-        Pattern.compile(
-            "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-z]{2,}"
-        )
+    private val accountNamePattern = Pattern.compile(ACCOUNT_NAME_PATTERN_REGEX)
 
     /**
      * Opens an ecosystem app with the given account information.

core/src/test/java/com/nextcloud/android/common/core/utils/AccountNamePatternTest.kt

@@ -0,0 +1,55 @@
+/*
+ * Nextcloud Android Common Library
+ *
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: MIT
+ */
+
+package com.nextcloud.android.common.core.utils
+
+import com.nextcloud.android.common.core.utils.ecosystem.EcosystemManager
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.util.regex.Pattern
+
+/**
+ * Unit tests for validating account name format using the same
+ * regular expression as {@link EcosystemManager}.
+ *
+ * These tests verify that:
+ * - Valid account names (e.g. "abc@example.cloud.com") are accepted
+ * - Invalid or malformed account names are rejected
+ * - Edge cases such as empty or blank strings do not match
+ *
+ * The account name is expected to follow an email-like format and is
+ * used when passing account information between ecosystem apps.
+ */
+class AccountNamePatternTest {
+    private val pattern = Pattern.compile(EcosystemManager.ACCOUNT_NAME_PATTERN_REGEX)
+
+    @Test
+    fun `valid account names should match`() {
+        assertTrue(pattern.matcher("abc@example.cloud.com").matches())
+        assertTrue(pattern.matcher("user.name+test@sub.domain.org").matches())
+        assertTrue(pattern.matcher("user_123@test.co").matches())
+    }
+
+    @Test
+    fun `invalid account names should not match`() {
+        assertFalse(pattern.matcher("abc").matches())
+        assertFalse(pattern.matcher("abc@").matches())
+        assertFalse(pattern.matcher("abc@example").matches())
+        assertFalse(pattern.matcher("abc@example.").matches())
+        assertFalse(pattern.matcher("abc@.com").matches())
+        assertFalse(pattern.matcher("@example.com").matches())
+        assertFalse(pattern.matcher("abc@example.c").matches())
+        assertFalse(pattern.matcher("abc example@test.com").matches())
+    }
+
+    @Test
+    fun `empty or blank account names should not match`() {
+        assertFalse(pattern.matcher("").matches())
+        assertFalse(pattern.matcher(" ").matches())
+    }
+}