chore: add a script to test for regressions

.gitignore

@@ -1 +1,3 @@
 template/*.pdf
+
+tests/

test-regression.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# Clean up previous test results
+if [ -d "tests/original-res" ]; then
+    rm -r tests/original-res
+fi
+if [ -d "tests/modified-res" ]; then
+    rm -r tests/modified-res
+fi
+if [ -d "tests/modified" ]; then
+    rm -r tests/modified
+fi
+if [ -d "tests/original/src" ]; then
+    rm -r tests/original/src
+fi
+
+mkdir -p tests/original-res
+mkdir -p tests/modified-res
+
+# Copy current template
+cp -r src/ tests/original/src
+
+cp -r tests/original tests/modified
+# replace the "#import "@local/ktu-paper:0.1.0"" 
+# with "#import "./src/lib.typ"" in the modified files
+find tests/modified -type f -name "*.typ" -exec \
+    sed -i 's/#import "@local\/ktu-paper:0.1.0"/#import ".\/src\/lib.typ"/g' {} \;
+find tests/modified -type f -name "ataskaita.typ" -exec \
+    sed -i 's/setup-page/ktu-paper/g' {} \;
+
+# Compile the original document
+typst compile --root tests/original tests/original/ataskaita.typ "tests/original-res/{0p}.png"
+# Compile the modified document
+typst compile --root tests/modified tests/modified/ataskaita.typ "tests/modified-res/{0p}.png"
+typst compile --root tests/modified tests/modified/ataskaita.typ "tests/modified.pdf"
+
+# Compare the results
+diff -r tests/original-res tests/modified-res
+if [ $? -eq 0 ]; then
+    echo "No differences found between original and modified results."
+else
+    echo "Differences found between original and modified results."
+fi