diff --git a/app/src/test/kotlin/fr/free/nrw/commons/logging/FileLoggingTreeUnitTest.kt b/app/src/test/kotlin/fr/free/nrw/commons/logging/FileLoggingTreeUnitTest.kt
new file mode 100644
index 000000000..076e6214a
--- /dev/null
+++ b/app/src/test/kotlin/fr/free/nrw/commons/logging/FileLoggingTreeUnitTest.kt
@@ -0,0 +1,143 @@
+package fr.free.nrw.commons.logging
+
+import android.util.Log
+import com.nhaarman.mockitokotlin2.times
+import com.nhaarman.mockitokotlin2.verify
+import org.junit.Before
+import org.junit.Test
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.mockito.Mock
+import org.mockito.MockitoAnnotations
+import org.powermock.reflect.Whitebox
+import org.slf4j.Logger
+import java.lang.reflect.Method
+import java.util.concurrent.Executor
+
+class FileLoggingTreeUnitTest {
+
+    private lateinit var fileLoggingTree: FileLoggingTree
+
+    @Mock
+    private lateinit var executor: Executor
+
+    @Mock
+    private lateinit var logger: Logger
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+        fileLoggingTree = FileLoggingTree(
+            Log.VERBOSE,
+            "test",
+            "test",
+            1000,
+            executor
+        )
+        Whitebox.setInternalState(fileLoggingTree, "logger", logger)
+    }
+
+    @Test
+    fun testSetLogLevel() {
+        var logLevel = Log.VERBOSE
+        Whitebox.setInternalState(fileLoggingTree, "logLevel", logLevel)
+        fileLoggingTree.setLogLevel(Log.DEBUG)
+        logLevel = Log.DEBUG
+        assertEquals(logLevel, logLevel)
+    }
+
+    @Test
+    fun testLog() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "log", Int::class.java, String::class.java, String::class.java, Throwable::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, 0, "test", "test", Throwable())
+    }
+
+    @Test
+    fun testLogMessageCaseVERBOSE() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.VERBOSE, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).trace(messageWithTag)
+    }
+
+    @Test
+    fun testLogMessageCaseDEBUG() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.DEBUG, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).debug(messageWithTag)
+    }
+
+    @Test
+    fun testLogMessageCaseINFO() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.INFO, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).info(messageWithTag)
+    }
+
+    @Test
+    fun testLogMessageCaseWARN() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.WARN, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).warn(messageWithTag)
+    }
+
+    @Test
+    fun testLogMessageCaseERROR() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.ERROR, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).error(messageWithTag)
+    }
+
+    @Test
+    fun testLogMessageCaseASSERT() {
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "logMessage", Int::class.java, String::class.java, String::class.java
+        )
+        method.isAccessible = true
+        method.invoke(fileLoggingTree, Log.ASSERT, "test", "test")
+        val messageWithTag = String.format("[%s] : %s", "test", "test")
+        verify(logger, times(1)).error(messageWithTag)
+    }
+
+    @Test
+    fun testIsLoggableCaseTrue() {
+        Whitebox.setInternalState(fileLoggingTree, "logLevel", Log.VERBOSE)
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "isLoggable", Int::class.java
+        )
+        method.isAccessible = true
+        assertEquals(method.invoke(fileLoggingTree, Log.ASSERT), true)
+    }
+
+    @Test
+    fun testIsLoggableCaseFalse() {
+        Whitebox.setInternalState(fileLoggingTree, "logLevel", Log.ASSERT)
+        val method: Method = FileLoggingTree::class.java.getDeclaredMethod(
+            "isLoggable", Int::class.java
+        )
+        method.isAccessible = true
+        assertEquals(method.invoke(fileLoggingTree, Log.VERBOSE), false)
+    }
+
+}
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