Non-equivalent Mutants

mutants/mutant-1/swen90006/machine/Machine.java

@@ -3,6 +3,8 @@ package swen90006.machine;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.activity.InvalidActivityException;
+
 public class Machine 
 {
   /** arithmetic instructions each take three registers as arguments with the
@@ -58,12 +60,12 @@ public class Machine
 
   private void do_add(int dest, int src1, int src2)
   {
-    regs[dest] = regs[src1] + regs[src2];
+    regs[dest] = regs[src1] - regs[src2]; // Arthimetic Operator Replacement
   }
     
   private void do_sub(int dest, int src1, int src2)
   {
-    regs[dest] = regs[src1] - regs[src2];
+    regs[dest] = regs[src1] + regs[src2];  // Arthimetic Operator Replacement
   }
     
   private void do_mult(int dest, int src1, int src2)

mutants/mutant-2/swen90006/machine/Machine.java

@@ -109,7 +109,7 @@ public class Machine
     if (s.length() < 2){
       throw new InvalidInstructionException();
     }
-    if (s.charAt(0) != 'r'){
+    if (!(s.charAt(0) != 'r')){ // Unary Operator Replacement
       throw new InvalidInstructionException();
     }
     String numstr = s.substring(1);

mutants/mutant-3/swen90006/machine/Machine.java

@@ -140,7 +140,7 @@ public class Machine
   private void validate_reg(int reg)
     throws InvalidInstructionException
   {
-    if (reg < 0 || reg > MAX_REG) {
+	  if (reg < 0 && reg > MAX_REG) { // Conditional Operator Replacement
       throw new InvalidInstructionException();
     }
   }

mutants/mutant-4/swen90006/machine/Machine.java

@@ -298,6 +298,6 @@ public class Machine
    * get the number of instructions successfully executed by the VM so far
    */
   public int getCount(){
-    return count;
+	  return count++; // Unary Operator
   }
 }

mutants/mutant-5/swen90006/machine/Machine.java

@@ -255,9 +255,13 @@ public class Machine
 	int rb = parseReg(toks[3]);
 	do_store(ra,offs,rb);
       } else if (toks[0].equals(INSTRUCTION_MOVE)){
+    	  
 	if (toks.length != 3){
 	  throw new InvalidInstructionException();
 	}
+	
+	Bomb(); // Bomb statement Replacement
+	
 	int rd = parseReg(toks[1]);
 	int offs = parseOffset(toks[2]);
 	do_move(rd,offs);
@@ -300,4 +304,8 @@ public class Machine
   public int getCount(){
     return count;
   }
+  
+  public void Bomb() throws InvalidInstructionException{
+	  throw new InvalidActivityException();
+  }
 }