Add unit tests for FileLockingHelper

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

app/src/test/java/com/nextcloud/android/files/FileLockingHelperTest.kt

@@ -0,0 +1,74 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Álvaro Brey Vilas
+ * Copyright (C) 2022 Álvaro Brey Vilas
+ * Copyright (C) 2022 Nextcloud GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.nextcloud.android.files
+
+import com.owncloud.android.datamodel.OCFile
+import com.owncloud.android.lib.resources.files.model.FileLockType
+import org.junit.Assert
+import org.junit.Test
+
+class FileLockingHelperTest {
+
+    @Test
+    fun fileNotLocked_cannotUnlock() {
+        val file = OCFile("/foo.md").apply {
+            isLocked = false
+            lockOwnerId = USER_NAME
+            lockType = FileLockType.MANUAL
+        }
+        Assert.assertFalse(FileLockingHelper.canUserUnlockFile(USER_NAME, file))
+    }
+
+    @Test
+    fun ownerNotUser_cannotUnlock() {
+        val file = OCFile("/foo.md").apply {
+            isLocked = true
+            lockOwnerId = "bloop"
+            lockType = FileLockType.MANUAL
+        }
+        Assert.assertFalse(FileLockingHelper.canUserUnlockFile(USER_NAME, file))
+    }
+
+    @Test
+    fun typeNotManual_cannotUnlock() {
+        val file = OCFile("/foo.md").apply {
+            isLocked = true
+            lockOwnerId = USER_NAME
+            lockType = FileLockType.COLLABORATIVE
+        }
+        Assert.assertFalse(FileLockingHelper.canUserUnlockFile(USER_NAME, file))
+    }
+
+    @Test
+    fun canUnlock() {
+        val file = OCFile("/foo.md").apply {
+            isLocked = true
+            lockOwnerId = USER_NAME
+            lockType = FileLockType.MANUAL
+        }
+        Assert.assertTrue(FileLockingHelper.canUserUnlockFile(USER_NAME, file))
+    }
+
+    companion object {
+        private const val USER_NAME = "user"
+    }
+}