[BAEL-3348] Moved code to algorithm-4

libraries-data/src/test/java/com/baeldung/crunch/TokenizerUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.crunch;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+import org.apache.crunch.Emitter;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class TokenizerUnitTest {
+    @Mock
+    private Emitter<String> emitter;
+
+    @Test
+    public void givenTokenizer_whenLineProcessed_thenOnlyExpectedWordsEmitted() {
+        Tokenizer splitter = new Tokenizer();
+
+        splitter.process("  hello  world ", emitter);
+
+        verify(emitter).emit("hello");
+        verify(emitter).emit("world");
+        verifyNoMoreInteractions(emitter);
+    }
+}