diff --git a/Dockerfile b/Dockerfile
index 3faf085..6a4f528 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,27 +1,45 @@
 ### Test Image specific config
+FROM rustlang/rust:nightly-alpine
 
-FROM rust:1.90-slim-trixie
-
-RUN apt-get update
-RUN apt-get -y install pkg-config libssl-dev moreutils
+# Install required packages
+RUN apk add --no-cache \
+    bash \
+    coreutils \
+    findutils \
+    gawk \
+    grep \
+    sed \
+    parallel \
+    pkgconfig \
+    openssl-dev \
+    build-base \
+    moreutils
 
 WORKDIR /app
+
+# Copy project structure
 COPY tests tests
 COPY tests_utility tests_utility
 COPY solutions solutions
+
+# Use sparse index for Cargo (faster network)
 ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-RUN parallel cargo fetch --manifest-path -- $(find tests -name Cargo.toml)
+
+# Pre-fetch all dependencies
+RUN find tests -name Cargo.toml | parallel cargo fetch --manifest-path {}
+
+# Fix permissions for Rust crates (avoid “permission denied”)
 RUN find /usr/local/cargo/registry/src -type f -name '*.rs' -exec chmod 644 {} \;
+
+# Remove solutions (only student code will be mounted)
 RUN rm -rf solutions
 
-### Default configs
-# ℹ️ URL of the Repository
-LABEL org.opencontainers.image.source=https://github.com/01-edu/rust-tests
-# ℹ️ Description of the Test Image
-LABEL org.opencontainers.image.description="01 Edu - Rust Test Image"
-# ℹ️ Licence type – MIT by default
-LABEL org.opencontainers.image.licenses=MIT
+### Metadata labels
+LABEL org.opencontainers.image.source="https://github.com/01-edu/rust-tests"
+LABEL org.opencontainers.image.description="01 Edu - Rust Test Image (Alpine)"
+LABEL org.opencontainers.image.licenses="MIT"
 
+# Copy entrypoint and isolate script
 COPY entrypoint.sh ./
 COPY isolate.sh ./
 
diff --git a/entrypoint.sh b/entrypoint.sh
index d79bbc0..774e840 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,8 +1,6 @@
 #!/usr/bin/env bash
-
 set -eo pipefail
-IFS='
-'
+IFS=$'\n'
 
 # support both variables CODE_EDITOR_RUN_ONLY and EXAM_RUN_ONLY
 CODE_EDITOR_RUN_ONLY="${CODE_EDITOR_RUN_ONLY:-$EXAM_RUN_ONLY}"
@@ -13,26 +11,42 @@ cp -a /app/tests .
 cp -a /app/isolate.sh .
 cp -a student solutions
 
-if test "$CODE_EDITOR_MODE"; then
-		cd "solutions/$EXERCISE"
-		# ! to support both the old and the new version of the runner we
-		# ! need to check the files in the code editor
-		if ! echo "$EDITOR_FILES" | tr ',' '\n' | grep -q 'src/main.rs'; then
-			if test "$CODE_EDITOR_RUN_ONLY"; then
-				mv src/lib.rs src/main.rs 2>&1 ||:
-			fi
-		fi
-		cargo init
-		cd
+if [ "$CODE_EDITOR_MODE" ]; then
+    cd "solutions/$EXERCISE"
+    # Support both old/new code editor runners
+    if ! echo "$EDITOR_FILES" | tr ',' '\n' | grep -q 'src/main.rs'; then
+        if [ "$CODE_EDITOR_RUN_ONLY" ]; then
+            mv src/lib.rs src/main.rs 2>/dev/null || true
+        fi
+    fi
+    cargo init
+    cd -
 fi
 
-if ! test -f "tests/${EXERCISE}_test/Cargo.toml"; then
-	echo "No test file found for the exercise : $EXERCISE"
-	exit 1
+if [ ! -f "tests/${EXERCISE}_test/Cargo.toml" ]; then
+    echo "No test file found for the exercise: $EXERCISE"
+    exit 1
 fi
 
-if test "$CODE_EDITOR_RUN_ONLY"; then
-	cargo run --manifest-path "solutions/$EXERCISE/Cargo.toml" -- "$@"
+# Ensure EXERCISE is inherited by isolate.sh
+export EXERCISE
+# Ensure current directory is in PATH for isolate.sh
+export PATH=".:$PATH"
+
+if [ "$CODE_EDITOR_RUN_ONLY" ]; then
+    cargo run --manifest-path "solutions/$EXERCISE/Cargo.toml" -- "$@"
 else
-	cargo --config 'target."cfg(all())".runner="./isolate.sh"' test --manifest-path "tests/${EXERCISE}_test/Cargo.toml"
+    # 1) Compile tests first, without running
+    set +e
+    cargo test --no-run --manifest-path "tests/${EXERCISE}_test/Cargo.toml"
+    rc=$?
+    set -e
+    if [ "$rc" -ne 0 ]; then
+        echo "Solution did not compile."
+        exit 1
+    fi
+
+    # 2) Run tests with isolate.sh as runner
+    cargo --config 'target."cfg(all())".runner="./isolate.sh"' \
+        test --manifest-path "tests/${EXERCISE}_test/Cargo.toml"
 fi
diff --git a/isolate.sh b/isolate.sh
index 6f0414e..ab82539 100755
--- a/isolate.sh
+++ b/isolate.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Use:
-#   cargo --config 'target."cfg(all())".runner="./isolate.sh"' test [args]
+#   cargo --config 'target."cfg(all())".runner="./isolate.sh"' test --manifest-path "tests/${EXERCISE}_test/Cargo.toml"
 
 set -u
 
@@ -39,7 +39,7 @@ awk -F': test' '/: test/{print $1}' "$tmpdir/list.txt" | sed 's/[[:space:]]*$//'
 (
   "$bin" "${filtered[@]}" 2>&1
   echo "__RC__$?"
-) | tee "$logfile" >/dev/null
+) | tee "$logfile"
 rc="$(awk -F'__RC__' '/__RC__/ {v=$2} END{print v+0}' "$logfile")"
 
 # 3) Collect tests that actually produced a result line:
@@ -56,18 +56,18 @@ awk '
   }
 ' "$logfile" | sed 's/[[:space:]]*$//' > "$actual"
 
-# 4) Decide: require (a) rc==0, (b) final summary ok, (c) every expected test appeared
-if [[ "$rc" -eq 0 ]] && grep -Eq '^test result: ok\.' "$logfile"; then
-  sort -u "$expected" -o "$expected"
-  sort -u "$actual"   -o "$actual"
-  # If no tests were expected (filters matched none), that's fine too.
-  if comm -23 "$expected" "$actual" | read -r _; then
-    # there were missing tests → failure
-    echo "Some tests weren't ran for the exercise \`$EXERCISE\`. Perhaps the solution forcefully exits?"
-    exit 1
-  else
-    exit 0
-  fi
+# 4) Decide overall success/failure
+sort -u "$expected" -o "$expected"
+sort -u "$actual"   -o "$actual"
+
+missing=0
+if comm -23 "$expected" "$actual" | read -r _; then
+  echo "Some tests weren't ran for the exercise \`$EXERCISE\`. Perhaps the solution forcefully exits?"
+  missing=1
+fi
+
+if [[ "$rc" -eq 0 ]] && grep -Eq '^test result: ok\.' "$logfile" && [[ $missing -eq 0 ]]; then
+  exit 0
 fi
 
 exit 1