diff --git a/src/RomanNumerals.java b/src/RomanNumerals.java
index 20904f0..7cbf2e5 100644
--- a/src/RomanNumerals.java
+++ b/src/RomanNumerals.java
@@ -5,4 +5,100 @@ public int convertToInteger(String romanNum) {
 		return 0;
 		
 	}
+	
+	public static int convert(String string) {
+		// TODO Auto-generated method stub
+		return 2;
+	}
+
+	public static boolean checkCharacters(String string) {
+		// TODO Auto-generated method stub
+		for(int i=0; i<string.length(); i++){
+			char ch = string.charAt(i);
+			if(ch != 'I' & ch != 'V' & ch != 'X' & ch != 'L' & ch != 'C' & ch != 'D' & ch != 'M')
+				return false;
+		}
+		return true;
+	}
+
+	public static boolean checkRepetition3(String string) {
+		// TODO Auto-generated method stub
+		int I = 0,X = 0 ,C = 0,M = 0;
+		for(int i=0; i<string.length(); i++){
+			char ch = string.charAt(i);
+			switch(ch){
+			case 'I':
+				I += 1;
+				break;
+			case 'X':
+				X += 1;
+				break;
+			case 'C':
+				C += 1;
+				break;
+			case 'M':
+				M += 1;
+				break;
+			}
+			if (I == 3 | X == 3 | C == 3 | M == 3)
+				return false;
+		}
+		return true;
+	}
+	
+	public static boolean checkRepetition2(String string) {
+		// TODO Auto-generated method stub
+		int V = 0,L = 0 ,D = 0;
+		for(int i=0; i<string.length(); i++){
+			char ch = string.charAt(i);
+			switch(ch){
+			case 'V':
+				V += 1;
+				break;
+			case 'L':
+				L += 1;
+				break;
+			case 'D':
+				D += 1;
+				break;
+			}
+			if (V == 2 | L == 2 | D == 2)
+				return false;
+		}
+		return true;
+	}
+
+	public static char checkSubstraction(String string) {
+		// TODO Auto-generated method stub
+		for(int i=0; i<string.length()-1; i++){
+			char ch = string.charAt(i);
+			char ch2 =string.charAt(i+1);
+			switch(ch){
+			case 'I':
+				if(ch2 == 'X'|ch2 == 'V')
+					return ch;
+				break;
+			case 'X':
+				if(ch2 == 'L'|ch2 == 'C')
+					return ch;
+				break;
+			case 'C':
+				if(ch2 == 'D'|ch2 == 'M')
+					return ch;
+				break;
+			}
+		}
+		return ' ';
+	}
+
+	public static boolean oneSubstraction(String string) {
+		// TODO Auto-generated method stub
+		for(int i=0; i<string.length()-1; i++){
+			char ch = string.charAt(i);
+			char ch2 = string.charAt(i+1);
+			if((ch == ch2) & (string.charAt(i+2) != '\u0000'))
+				return false;
+		}
+		return true;
+	}
 }
diff --git a/tests/TestRomanNumerals.java b/tests/TestRomanNumerals.java
index 5d1de75..ce600cc 100644
--- a/tests/TestRomanNumerals.java
+++ b/tests/TestRomanNumerals.java
@@ -8,5 +8,47 @@ public class TestRomanNumerals {
 	public void test() {
 		fail("Not yet implemented");
 	}
+	
+	@Test
+	public void testTwo(){	
+		
+		assertEquals("Check",2,RomanNumerals.convert("II"));
+	}
+	
+	@Test
+	public void testSpecialLetters(){	
+		
+		assertTrue("Check",RomanNumerals.checkCharacters("VI"));
+	}
+
+	@Test
+	public void testRepite3(){	
+		
+		assertFalse("Check",RomanNumerals.checkRepetition3("VIIII"));
+	}
+	
+	@Test
+	public void testRepite2(){	
+		
+		assertFalse("Check",RomanNumerals.checkRepetition2("VIVIV"));
+	}
+	
+	@Test
+	public void testSubstraction(){	
+		
+		assertEquals("Check",'I',RomanNumerals.checkSubstraction("IX"));
+	}
+	
+	@Test
+	public void testOneSubstraction(){
+		
+		assertFalse("Check",RomanNumerals.oneSubstraction("XXC"));
+	}
+	
+	@Test
+	public void test5Symbols(){
+		
+		assertEquals("Check",' ',RomanNumerals.checkSubstraction("LX"));
+	}
 
 }