Adding Junit practice classes

.gitignore

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+!**/src/main/**/target/
+!**/src/test/**/target/
+
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pom.xml

+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.example</groupId>
+  <artifactId>junit-practice</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+
+  <name>junit-practice</name>
+  <url>http://maven.apache.org</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>RELEASE</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>

src/main/java/com/nisum/App.java

+package com.nisum;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+    }
+}

src/main/java/com/nisum/junit/helper/StringHelper.java

+package com.nisum.junit.helper;
+
+public class StringHelper {
+
+    //TODO: AACD => CD , ACD => CD , CDEF => CDEF , CDAA => CDAA. Bacause, only first 2 A's it will truncate.
+
+    public String truncateAInFirst2Positions(String str) {
+        if (str.length() <= 2)
+            return str.replaceAll("A", "");
+
+        String first2Chars = str.substring(0, 2);
+        String stringMinusFirst2Chars = str.substring(2);
+
+        return first2Chars.replaceAll("A", "") + stringMinusFirst2Chars;
+    }
+
+
+    //TODO: ABCD => false, because first and last 2 chars are different.
+    //TODO: ABAB => true,
+    //TODO: AB => true, if there are chars, we are returning true.
+    //TODO: A => false , if there is only 1 char, then returning false
+
+    public boolean areFirstAndLastTwoCharactersTheSame(String str) {
+
+        if (str.length() <= 1)
+            return false;
+        if (str.length() == 2)
+            return true;
+
+        String first2Chars = str.substring(0, 2);
+
+        String last2Chars = str.substring(str.length() - 2);
+
+        return first2Chars.equals(last2Chars);
+    }
+}

src/test/java/com/nisum/AppTest.java

+package com.nisum;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+import junit.framework.TestSuite;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+    extends TestCase
+{
+    /**
+     * Create the test case
+     *
+     * @param testName name of the test case
+     */
+    public AppTest( String testName )
+    {
+        super( testName );
+    }
+
+    /**
+     * @return the suite of tests being tested
+     */
+    public static Test suite()
+    {
+        return new TestSuite( AppTest.class );
+    }
+
+    /**
+     * Rigourous Test :-)
+     */
+    public void testApp()
+    {
+        assertTrue( true );
+    }
+}

src/test/java/com/nisum/junit/helper/QuickBeforeAfterTest.java

+package com.nisum.junit.helper;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class QuickBeforeAfterTest {
+
+    // Using beforeClass annotation
+    //TODO: BeforeClass method should be always static
+    @BeforeClass
+    public static void beforeClass(){
+        System.out.println("Before Class");
+    }
+
+    @Before
+    public void setup(){
+        System.out.println("Before test");
+    }
+
+    @Test
+    public void test1(){
+        System.out.println("test1 executed");
+    }
+
+    @Test
+    public void test2(){
+        System.out.println("test2 executed");
+    }
+
+    @After
+    public void teardown(){
+        System.out.println("After test");
+    }
+
+}

src/test/java/com/nisum/junit/helper/StringHelperTest.java

+package com.nisum.junit.helper;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.fail;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class StringHelperTest {
+
+   // StringHelper helper = new StringHelper();
+
+    StringHelper helper;
+
+    @Before
+    public void before(){
+        System.out.println("Before test");
+    }
+
+    @Test
+    public void testTruncateAInFirst2Positions_AInFirst2Positions(){
+        // Creating instance of StringHelper class.
+        //TODO: AACD => CD , ACD => CD , CDEF => CDEF , CDAA => CDAA. Bacause, only first 2 A's it will truncate.
+        assertEquals("CD", helper.truncateAInFirst2Positions("AACD"));
+        assertEquals("CD", helper.truncateAInFirst2Positions("ACD"));
+        assertEquals("CDEF", helper.truncateAInFirst2Positions("CDEF"));
+        assertEquals("CDAA", helper.truncateAInFirst2Positions("CDAA"));
+        assertEquals("EEAD", helper.truncateAInFirst2Positions("EEAD"));
+        assertEquals("CCCA", helper.truncateAInFirst2Positions("CCCA"));
+    }
+
+    @Test
+    public void testTruncateAInFirst2Positions2_AInFirst1Position(){
+        assertEquals("CD", helper.truncateAInFirst2Positions("ACD"));
+    }
+
+    @Test
+    public void testTruncateAInFirst2Positions_WithoutAInAllPositions(){
+        assertEquals("CDEF", helper.truncateAInFirst2Positions("CDEF"));
+    }
+
+    @Test
+    public void testTruncateAInFirst2Positions_AInLast2Positions(){
+        assertEquals("CDAA", helper.truncateAInFirst2Positions("CDAA"));
+    }
+
+    @Test
+    public void testAreFirstAndLastTwoCharactersTheSame_BasicNegativeScenario(){
+
+        // Use inline option to make the code less.
+        /*boolean actual = helper.areFirstAndLastTwoCharactersTheSame("ABCD");
+        boolean expected = false;*/
+        assertEquals(false, helper.areFirstAndLastTwoCharactersTheSame("ABCD"));
+
+        // Using assertFalse method which checks the provided value (actual value) is false or not.
+        assertFalse(helper.areFirstAndLastTwoCharactersTheSame("ABCD"));
+    }
+
+    // Using assertTrue
+    @Test
+    public void testAreFirstAndLastTwoCharactersTheSame_BasicPositiveScenario(){
+
+        assertTrue( helper.areFirstAndLastTwoCharactersTheSame("ABAB"));
+    }
+}