Complete with Java8

seabornlee · seabornlee · commit b59b50f0c413 · 2017-05-13T16:19:07.000+08:00
diff --git a/src/test/java/WordFrequency.java b/src/test/java/WordFrequency.java
@@ -0,0 +1,14 @@
+import java.util.Arrays;
+
+import static java.util.stream.Collectors.groupingBy;
+import static java.util.stream.Collectors.joining;
+
+public class WordFrequency {
+    public static String handle(String text) {
+        if (!text.equals("")) {
+            return Arrays.stream(text.split(" ")).collect(groupingBy((w) -> w)).entrySet().stream()
+            .sorted((e1, e2) -> e2.getValue().size() - e1.getValue().size()).map((e) -> e.getKey() + " " + e.getValue().size()).collect(joining("\r\n"));
+        }
+        return "";
+    }
+}
diff --git a/src/test/java/WordFrequencyTest.java b/src/test/java/WordFrequencyTest.java
@@ -1,2 +1,65 @@
+import org.junit.Test;
+
+import static org.fest.assertions.api.Assertions.assertThat;
+
 public class WordFrequencyTest {
+    @Test
+    public void should_handle_blank_text() {
+        // given
+        String text = "";
+
+        // when
+        String result = WordFrequency.handle(text);
+
+        // then
+        assertThat(result).isEqualTo("");
+    }
+    
+    @Test
+    public void should_handle_one_word_text() {
+        // given
+        String text = "one";
+
+        // when
+        String result = WordFrequency.handle(text);
+
+        // then
+        assertThat(result).isEqualTo("one 1");
+    }
+
+    @Test
+    public void should_handle_two_different_words_text() {
+        // given
+        String text = "one two";
+
+        // when
+        String result = WordFrequency.handle(text);
+
+        // then
+        assertThat(result).isEqualTo("one 1\r\ntwo 1");
+    }
+
+    @Test
+    public void should_handle_duplicated_words_text() {
+        // given
+        String text = "one two one";
+
+        // when
+        String result = WordFrequency.handle(text);
+
+        // then
+        assertThat(result).isEqualTo("one 2\r\ntwo 1");
+    }
+
+    @Test
+    public void should_handle_the_order() {
+        // given
+        String text = "one two two";
+
+        // when
+        String result = WordFrequency.handle(text);
+
+        // then
+        assertThat(result).isEqualTo("two 2\r\none 1");
+    }
 }
