diff --git a/.github/workflows/solve.yaml b/.github/workflows/solve.yaml
index 944d306..b3c62da 100644
--- a/.github/workflows/solve.yaml
+++ b/.github/workflows/solve.yaml
@@ -15,6 +15,8 @@ jobs:
           distribution: 'corretto' # See 'Supported distributions' for available options
           java-version: '21'
       - uses: https://github.com/fwilhe2/setup-kotlin@main
+      - name: Run tests
+        run: ./simpletest.sh
       - name: Solutions
         run: |
           set -e
diff --git a/day01.kts b/day01.kts
old mode 100644
new mode 100755
index 7cc4c52..6e0b093
--- a/day01.kts
+++ b/day01.kts
@@ -1,3 +1,4 @@
+#!/usr/bin/env kotlin
 import java.io.File
 import java.util.Scanner
 import kotlin.math.abs
diff --git a/day01.kts.testvalue b/day01.kts.testvalue
new file mode 100644
index 0000000..95be46d
--- /dev/null
+++ b/day01.kts.testvalue
@@ -0,0 +1,2 @@
+Total distance: 1603498
+Similarity score: 25574739
diff --git a/day02.kts b/day02.kts
old mode 100644
new mode 100755
index 36a0369..094a90d
--- a/day02.kts
+++ b/day02.kts
@@ -1,3 +1,4 @@
+#!/usr/bin/env kotlin
 import java.io.File
 import java.util.Scanner
 import kotlin.math.abs
diff --git a/day02.kts.testvalue b/day02.kts.testvalue
new file mode 100644
index 0000000..e543821
--- /dev/null
+++ b/day02.kts.testvalue
@@ -0,0 +1,2 @@
+Safe lines: 472
+Safe lines with dampener: 520
diff --git a/day03.kts b/day03.kts
old mode 100644
new mode 100755
index 5e51d18..d9252a5
--- a/day03.kts
+++ b/day03.kts
@@ -1,3 +1,4 @@
+#!/usr/bin/env kotlin
 import java.io.File
 import java.util.Scanner
 
diff --git a/day03.kts.testvalue b/day03.kts.testvalue
new file mode 100644
index 0000000..b5d5008
--- /dev/null
+++ b/day03.kts.testvalue
@@ -0,0 +1,2 @@
+Part One Sum: 187833789
+Part Two Sum: 94455185
diff --git a/simpletest.sh b/simpletest.sh
new file mode 100755
index 0000000..ab7231b
--- /dev/null
+++ b/simpletest.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Function to show usage
+usage() {
+    echo "Usage: $0 [write|validate]"
+    exit 1
+}
+
+# Ensure a mode is provided
+if [[ $# -ne 1 ]]; then
+    usage
+fi
+
+MODE=$1
+
+# Write mode
+if [[ "$MODE" == "write" ]]; then
+    echo "Running in write mode..."
+
+    for script in *.kts; do
+        test_file="${script}.testvalue"
+
+        echo "Processing $script..."
+        output=$(kotlin "$script" 2>&1)
+
+        if [[ -f "$test_file" ]]; then
+            if [[ "$output" == "$(cat "$test_file")" ]]; then
+                echo "No change: $script"
+            else
+                echo "Output changed for $script"
+                diff -u "$test_file" <(echo "$output")
+                read -p "Update test value? (y/n) " update
+                if [[ "$update" == "y" ]]; then
+                    echo "$output" > "$test_file"
+                    echo "Updated $test_file"
+                fi
+            fi
+        else
+            echo "$output" > "$test_file"
+            echo "Created $test_file"
+        fi
+    done
+
+    for test_file in *.kts.testvalue; do
+        script="${test_file%.testvalue}"
+        if [[ ! -f "$script" ]]; then
+            echo "Test file $test_file does not have a matching script."
+            read -p "Delete $test_file? (y/n) " delete
+            if [[ "$delete" == "y" ]]; then
+                rm "$test_file"
+                echo "Deleted $test_file"
+            fi
+        fi
+    done
+
+# Validate mode
+elif [[ "$MODE" == "validate" ]]; then
+    echo "Running in validate mode..."
+    pass=0
+    fail=0
+
+    for test_file in *.kts.testvalue; do
+        script="${test_file%.testvalue}"
+        if [[ -f "$script" ]]; then
+            output=$(kotlin "$script" 2>&1)
+            if [[ "$output" == "$(cat "$test_file")" ]]; then
+                echo "PASS: $script"
+                ((pass++))
+            else
+                echo "FAIL: $script"
+                diff -u "$test_file" <(echo "$output")
+                ((fail++))
+            fi
+        else
+            echo "Orphaned test file: $test_file (no matching script)"
+            ((fail++))
+        fi
+    done
+
+    echo "Summary: $pass pass, $fail fail"
+
+    if [[ $fail -gt 0 ]]; then
+        exit 1
+    else
+        exit 0
+    fi
+
+else
+    usage
+fi