diff --git a/inputs/addu.ref.txt b/inputs/addu.ref.txt
new file mode 100644
index 0000000..301160a
--- /dev/null
+++ b/inputs/addu.ref.txt
@@ -0,0 +1 @@
+8
\ No newline at end of file
diff --git a/test/test_mips_cpu_harvard.sh b/test/test_mips_cpu_harvard.sh
index 63cae06..3086986 100644
--- a/test/test_mips_cpu_harvard.sh
+++ b/test/test_mips_cpu_harvard.sh
@@ -1,11 +1,10 @@
 #!/bin/bash
 
-# should not create any files in the rtl dir
-# but auxiliary files / dirs can be utilised
-
+#**Delete command for windows before submission**
+#rm inputs/*.log.txt inputs/*.ref.txt
 
 # Source File & Source Directory Parsing
-SRC_DIR=${1?Error: no source directory given in argument};      # e.g. ./rtl
+SRC_DIR=${1?Error: no source directory given in argument};      # e.g. rtl
 SRC=$(ls ${SRC_DIR} | grep -E "harvard|memory|alu|regfile|pc|control");
 SRC_TEMP="";
 for src in ${SRC}
@@ -13,40 +12,52 @@ do
     SRC_TEMP+=${SRC_DIR}/${src}" ";
 done
 SRC=${SRC_TEMP}
-echo ${SRC}
 
 # Instruction Argument
 INSTR=${2:-"No instruction specified: running all testcases"};  # e.g. addiu
-echo ${INSTR};
 
 # Start Testing
 if [[ ${INSTR} == "No instruction specified: running all testcases" ]];
 then
     # All Testcase Files
-    TESTCASES=$(ls ./inputs | grep ".txt");
-    echo ${TESTCASES}
+    TESTCASES=$(find ./inputs ! -name '*ref*'  ! -name '*log*' ! -name '*out*' ! -name 'inputs' | sed 's#.*/##');
+    #echo ${TESTCASES}
     for TESTCASE in ${TESTCASES}
     do
-    # Run Each Testcase File
-    echo ${TESTCASE}
-/mnt/c/Windows/System32/cmd.exe /C \
+        # Run Each Testcase File
+        TESTCASE="${TESTCASE%%.*}";
+        #echo ${TESTCASE};
+#/mnt/c/Windows/System32/cmd.exe /C \
 iverilog -Wall -g2012 \
     -s mips_cpu_harvard_tb \
     -P mips_cpu_harvard_tb.RAM_INIT_FILE=\"inputs/${TESTCASE}.txt\" \
     -o exec/mips_cpu_harvard_tb_${TESTCASE} testbench/mips_cpu_harvard_tb.v \
-    ${SRC}
-/mnt/c/Windows/System32/cmd.exe /C vvp ./exec/mips_cpu_harvard_tb_${TESTCASE};
+    ${SRC} 2> /dev/null
+/mnt/c/Windows/System32/cmd.exe /C vvp ./exec/mips_cpu_harvard_tb_${TESTCASE} &> ./inputs/${TESTCASE}.log.txt;       # log file for debugging (contains $display)
+echo "$(tail -1 ./inputs/${TESTCASE}.log.txt)" > ./inputs/${TESTCASE}.out.txt;                                       # register v0 output to compare with reference
+if diff -w ./inputs/${TESTCASE}.out.txt ./inputs/${TESTCASE}.ref.txt &> /dev/null                                    # compare
+then 
+    echo ${TESTCASE} ${TESTCASE} "Pass";
+else 
+    printf '%s %s %s%d %s%d%s\n' "${TESTCASE}" "${TESTCASE}" "Fail Output=" "$(tail -1 ./inputs/${TESTCASE}.out.txt)" "Ref=" "$(tail -1 ./inputs/${TESTCASE}.ref.txt)" 2> /dev/null;
+fi
     done
 
 else
     # Run Testcase File Of Specified Instruction
-    echo ${INSTR};
 /mnt/c/Windows/System32/cmd.exe /C \
 iverilog -Wall -g2012 \
     -s mips_cpu_harvard_tb \
     -P mips_cpu_harvard_tb.RAM_INIT_FILE=\"inputs/${INSTR}.txt\" \
     -o exec/mips_cpu_harvard_tb_${INSTR} testbench/mips_cpu_harvard_tb.v \
-    ${SRC}
-/mnt/c/Windows/System32/cmd.exe /C vvp ./exec/mips_cpu_harvard_tb_${INSTR};
+    ${SRC} 2> /dev/null
+/mnt/c/Windows/System32/cmd.exe /C vvp ./exec/mips_cpu_harvard_tb_${INSTR} &> ./inputs/${INSTR}.log.txt;            # log file for debugging (contains $display)
+echo "$(tail -1 ./inputs/${INSTR}.log.txt)" > ./inputs/${INSTR}.out.txt;                                            # register v0 output to compare with reference
+if diff -w ./inputs/${INSTR}.out.txt ./inputs/${INSTR}.ref.txt &> /dev/null                                         # compare
+then 
+    echo ${INSTR} ${INSTR} "Pass";
+else 
+    printf '%s %s %s%d %s%d%s\n' "${INSTR}" "${INSTR}" "Fail Output=" "$(tail -1 ./inputs/${INSTR}.out.txt)" "Ref=" "$(tail -1 ./inputs/${INSTR}.ref.txt)" 2> /dev/null;
 fi
 
+fi