#10 ListedLanguages finished and tested

src/main/java/io/imagineobjects/linguinai/ListedLanguages.java

@@ -8,7 +8,6 @@
  * @author Mihai Andronache (amihaiemil@gmail.com)
  * @version $Id$
  * @since 0.0.1
- * @todo #8:60min Finish implementing this class and write unit tests for it.
  */
 final class ListedLanguages implements Languages {
 
@@ -27,7 +26,13 @@ final class ListedLanguages implements Languages {
 
     @Override
     public Language bestMatch() {
-        throw new UnsupportedOperationException("Not yet implemented.");
+        Language best = this.languages.get(0);
+        for(int i = 1; i < this.languages.size(); i++) {
+            if(this.languages.get(i).confidence() > best.confidence()) {
+                best = languages.get(i);
+            }
+        }
+        return best;
     }
 
     @Override

src/test/java/io/imagineobjects/linguinai/ListedLanguagesTestCase.java

@@ -0,0 +1,56 @@
+package io.imagineobjects.linguinai;
+
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import java.util.List;
+
+/**
+ * Unit tests for {@link ListedLanguages}.
+ * @author Mihai Andronache (amihaiemil@gmail.com)
+ * @version $Id$
+ * @since 0.0.1
+ */
+public final class ListedLanguagesTestCase {
+
+    /**
+     * ListedLanguages can be iterated.
+     */
+    @Test
+    public void canBeIterated() {
+        final Languages languages = new ListedLanguages(
+            List.of(
+                Mockito.mock(Language.class),
+                Mockito.mock(Language.class),
+                Mockito.mock(Language.class)
+            )
+        );
+        MatcherAssert.assertThat(
+            languages,
+            Matchers.iterableWithSize(3)
+        );
+    }
+
+    /**
+     * ListedLanguages can return the best match.
+     */
+    @Test
+    public void returnsBestMatch() {
+        final Language first = Mockito.mock(Language.class);
+        Mockito.when(first.confidence()).thenReturn(0.5);
+        final Language second = Mockito.mock(Language.class);
+        Mockito.when(second.confidence()).thenReturn(0.7);
+        final Language third = Mockito.mock(Language.class);
+        Mockito.when(third.confidence()).thenReturn(0.4);
+        final Languages languages = new ListedLanguages(
+            List.of(first, second, third)
+        );
+        MatcherAssert.assertThat(
+            languages.bestMatch(),
+            Matchers.is(second)
+        );
+    }
+
+}