Merge pull request #143 from gneokleo/master

Adding tests for RandomStringUtils

compute/src/main/java/com/chatalytics/compute/chat/dao/local/LocalChatDao.java

@@ -1,12 +1,12 @@
 package com.chatalytics.compute.chat.dao.local;
 
 import com.chatalytics.compute.chat.dao.IChatApiDAO;
-import com.chatalytics.core.RandomStringUtils;
 import com.chatalytics.core.config.ChatAlyticsConfig;
 import com.chatalytics.core.config.LocalTestConfig;
 import com.chatalytics.core.model.data.Message;
 import com.chatalytics.core.model.data.Room;
 import com.chatalytics.core.model.data.User;
+import com.chatalytics.core.util.RandomStringUtils;
 import com.google.common.collect.ImmutableMap;
 
 import org.apache.storm.shade.com.google.common.collect.Maps;

core/src/main/java/com/chatalytics/core/RandomStringUtils.java → core/src/main/java/com/chatalytics/core/util/RandomStringUtils.java

@@ -1,4 +1,4 @@
-package com.chatalytics.core;
+package com.chatalytics.core.util;
 
 import java.util.Random;
 

core/src/test/java/com/chatalytics/core/util/RandomStringUtilsTest.java

@@ -0,0 +1,44 @@
+package com.chatalytics.core.util;
+
+import org.junit.Test;
+
+import java.util.Random;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests {@link RandomStringUtils}
+ *
+ * @author giannis
+ *
+ */
+public class RandomStringUtilsTest {
+
+    @Test
+    public void testGenerateRandomAlphaNumericString() {
+        int length = 10;
+        String result = RandomStringUtils.generateRandomAlphaNumericString(length);
+        assertEquals(length, result.length());
+
+        length = 0;
+        result = RandomStringUtils.generateRandomAlphaNumericString(length);
+        assertEquals(length, result.length());
+    }
+
+    @Test
+    public void testGenerateRandomAlphaNumericString_withProvidedRandom() {
+        int length = 10;
+        StringBuilder strBuilder = new StringBuilder();
+        for (int i = 0; i < length; i++) {
+            strBuilder.append("a");
+        }
+        Random rand = mock(Random.class);
+        when(rand.nextInt(anyInt())).thenReturn(0);
+        String result = RandomStringUtils.generateRandomAlphaNumericString(length, rand);
+        assertEquals(length, result.length());
+        assertEquals(strBuilder.toString(), result);
+    }
+}