Use an executor to invoke the formatting routines from multiple threads concurrently

medialibrary/build.gradle

@@ -33,6 +33,10 @@ ext {
     libraryDescription = 'Android bindings and API for Medialibrary'
 }
 android {
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
     compileSdkVersion rootProject.ext.compileSdkVersion
     defaultConfig {
         minSdkVersion rootProject.ext.minSdkVersion

medialibrary/test/org/videolan/medialibrary/ToolsTest.java

@@ -1,29 +1,59 @@
 package org.videolan.medialibrary;
 
 import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
-
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
 import static org.junit.Assert.assertEquals;
 
-@RunWith(JUnit4::class)
 public class ToolsTest {
-    @Test
-    public void testIsArrayEmpty() {
 
+    @Test
+    public void testMillisToString() {
+        assertEquals("3min30s", Tools.millisToString(210000, true, true, false));
+        assertEquals("3min 30s ", Tools.millisToString(210000, true, true, true));
+        assertEquals("3min", Tools.millisToString(180000, true, true, false));
+        assertEquals("3min ", Tools.millisToString(180000, true, true, true));
+        assertEquals("1h30min30s", Tools.millisToString(5430000, true, true, false));
+        assertEquals("1h 30min 30s ", Tools.millisToString(5430000, true, true, true));
+        assertEquals("1h30min", Tools.millisToString(5430000, true, false, false));
+        assertEquals("1h 30min ", Tools.millisToString(5430000, true, false, true));
+        assertEquals("1h30min", Tools.millisToString(5400000, true, true, false));
+        assertEquals("17s", Tools.millisToString(17000, true, true, false));
+        assertEquals("17s ", Tools.millisToString(17000, true, true, true));
+        assertEquals("17s", Tools.millisToString(17000, true, false, false));
+        assertEquals("17s ", Tools.millisToString(17000, true, false, true));
+        assertEquals("1h30s", Tools.millisToString(3630000, true, true, false));
+        assertEquals("1h 30s ", Tools.millisToString(3630000, true, true, true));
+        assertEquals("-32:40", Tools.millisToString(-1960000, false, true, false));
     }
 
+    /**
+     * Perform multi-threaded testing of the duration formatting routines.
+     */
     @Test
-    public void testMillisToString() {
-        assertEquals("3min30s", Tools.millisToString(210000, true, true));
-        assertEquals("3min", Tools.millisToString(180000, true, true));
-        assertEquals("1h30min30s", Tools.millisToString(5430000, true, true));
-        assertEquals("1h30min", Tools.millisToString(5430000, true, false));
-        assertEquals("1h30min", Tools.millisToString(5400000, true, true));
-        assertEquals("17s", Tools.millisToString(17000, true, true));
-        assertEquals("17s", Tools.millisToString(17000, true, false));
-        assertEquals("1h30s", Tools.millisToString(3630000, true, true));
-        assertEquals("-32:40", Tools.millisToString(-1960000, false, true));
+    public void testConcurrentMillisToString() throws ExecutionException, InterruptedException {
+        List<Future> futureList = new ArrayList<>();
+        ExecutorService exec = Executors.newFixedThreadPool(2);
+        futureList.add(exec.submit(() -> {
+            for (int i = 0; i < 100; i++) {
+                assertEquals("3min30s", Tools.millisToString(210000, true, true, false));
+                assertEquals("-32:40", Tools.millisToString(-1960000, false, true, false));
+            }
+        }));
+        futureList.add(exec.submit(() -> {
+            for (int i = 0; i < 100; i++) {
+                assertEquals("3min", Tools.millisToString(180000, true, true, false));
+                assertEquals("54:32:10", Tools.millisToString(196330000L, false, true, false));
+            }
+        }));
+        for (Future f : futureList) f.get();
+        exec.shutdown();
+        exec.awaitTermination(10, TimeUnit.SECONDS);
     }
 
 }