diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
deleted file mode 100644
index 88d75be..0000000
--- a/.github/workflows/build.yaml
+++ /dev/null
@@ -1,99 +0,0 @@
-name: Build extensions
-
-on:
-  workflow_run:
-    workflows: ["Test extensions"]
-    types:
-      - completed
-
-concurrency:
-  group: ${{ github.workflow }}
-  cancel-in-progress: true
-
-jobs:
-  build:
-    name: Build extensions
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
-    env:
-      CARGO_COMPONENT_VERSION: "0.11.0"
-      SCCACHE_CACHE_SIZE: "2G"
-      SCCACHE_VERSION: "0.8.0"
-      RUSTC_WRAPPER: "/usr/local/bin/sccache"
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Restore sccache cache
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/sccache
-          key: ${{ runner.os }}-sccache-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-sccache-
-
-      - name: Restore cargo cache
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cargo/registry/index
-            ~/.cargo/registry/cache
-            ~/.cargo/git/db
-            ~/.cargo/bin
-            target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-cargo-
-
-      - name: Install sccache
-        run: |
-          if [ "${{ runner.os }}" = "Linux" ]; then
-            sccache_platform="x86_64-unknown-linux-musl"
-          elif [ "${{ runner.os }}" = "macOS" ]; then
-            sccache_platform="x86_64-apple-darwin"
-          elif [ "${{ runner.os }}" = "Windows" ]; then
-            sccache_platform="x86_64-pc-windows-msvc"
-          else
-            echo "Unsupported platform: ${{ runner.os }}"
-            exit 1
-          fi
-          sccache_file="sccache-v${SCCACHE_VERSION}-${sccache_platform}"
-          sccache_url="https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/${sccache_file}.tar.gz"
-          echo "URL=${sccache_url}"
-          curl -L "$sccache_url" | tar xz
-          mv -f "$sccache_file/sccache" "$RUSTC_WRAPPER"
-          chmod +x "$RUSTC_WRAPPER"
-
-      - name: Install wasm32-unknown-unknown target
-        uses: dtolnay/rust-toolchain@v1
-        with:
-          toolchain: stable
-          targets: wasm32-unknown-unknown
-
-      - name: Install cargo-component
-        run: |
-          if ! command -v cargo-component || ! cargo-component --version | grep -q $CARGO_COMPONENT_VERSION; then
-            cargo install cargo-component --locked --version $CARGO_COMPONENT_VERSION --force
-          fi
-
-      - name: Build extensions
-        run: cargo component build --release --workspace --target wasm32-unknown-unknown
-
-      - name: Package extensions
-        run: .github/workflows/package.sh
-
-      - name: Deploy to GitHub Pages
-        uses: JamesIves/github-pages-deploy-action@v4
-        with:
-          branch: gh-pages
-          folder: gh-pages
-          commit-message: "Update extensions repository"
-
-      - name: Upload packaged extensions as artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: extensions
-          path: gh-pages/extensions/*.mix
-          if-no-files-found: ignore
-
-      - name: Show sccache statistics
-        run: $RUSTC_WRAPPER --show-stats
diff --git a/.github/workflows/test-and-build.yaml b/.github/workflows/test-and-build.yaml
new file mode 100644
index 0000000..21ca842
--- /dev/null
+++ b/.github/workflows/test-and-build.yaml
@@ -0,0 +1,186 @@
+name: Build extensions
+
+on:
+  push:
+    branches: ['main']
+
+concurrency:
+  group: ${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Test modified extensions
+    env:
+      CARGO_COMPONENT_VERSION: "0.11.0"
+      SCCACHE_CACHE_SIZE: "2G"
+      SCCACHE_VERSION: "0.8.0"
+      RUSTC_WRAPPER: "/usr/local/bin/sccache"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Restore sccache cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/sccache
+          key: ${{ runner.os }}-sccache-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-sccache-
+      - name: Restore cargo cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index
+            ~/.cargo/registry/cache
+            ~/.cargo/git/db
+            ~/.cargo/bin
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+      - name: Install sccache
+        run: |
+          if [ "${{ runner.os }}" = "Linux" ]; then
+            sccache_platform="x86_64-unknown-linux-musl"
+          elif [ "${{ runner.os }}" = "macOS" ]; then
+            sccache_platform="x86_64-apple-darwin"
+          elif [ "${{ runner.os }}" = "Windows" ]; then
+            sccache_platform="x86_64-pc-windows-msvc"
+          else
+            echo "Unsupported platform: ${{ runner.os }}"
+            exit 1
+          fi
+          sccache_file="sccache-v${SCCACHE_VERSION}-${sccache_platform}"
+          sccache_url="https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/${sccache_file}.tar.gz"
+          echo "URL=${sccache_url}"
+          curl -L "$sccache_url" | tar xz
+          mv -f "$sccache_file/sccache" "$RUSTC_WRAPPER"
+          chmod +x "$RUSTC_WRAPPER"
+
+      - name: Install wasm32-unknown-unknown target
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+          targets: wasm32-unknown-unknown
+
+      - name: Install cargo-component
+        run: |
+          if ! command -v cargo-component || ! cargo-component --version | grep -q $CARGO_COMPONENT_VERSION; then
+            cargo install cargo-component --locked --version $CARGO_COMPONENT_VERSION --force
+          fi
+
+      - name: Run tests only on modified packages
+        run: |
+          changed_files=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }})
+          changed_packages_dir=$(echo "$changed_files" | grep -o '^src/[^/]*/[^/]*' | sort -u)
+          if [ -z "$changed_packages_dir" ]; then
+            echo "No packages to test"
+            exit 0
+          fi
+          while read -r package_dir; do
+            package_name=$(grep -oP -m 1 'name = "\K[^"]+' $package_dir/Cargo.toml)
+            echo "Running tests for $package_name"
+            cargo test --package $package_name
+          done <<< "$changed_packages_dir"
+
+      - name: Show sccache statistics
+        run: $RUSTC_WRAPPER --show-stats
+  rustfmt:
+    needs: test
+    name: Check formatting
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run `cargo fmt`
+        run: cargo fmt --all -- --check
+  build:
+    name: Build extensions
+    needs: rustfmt
+    env:
+      CARGO_COMPONENT_VERSION: "0.11.0"
+      SCCACHE_CACHE_SIZE: "2G"
+      SCCACHE_VERSION: "0.8.0"
+      RUSTC_WRAPPER: "/usr/local/bin/sccache"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Restore sccache cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/sccache
+          key: ${{ runner.os }}-sccache-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-sccache-
+
+      - name: Restore cargo cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry/index
+            ~/.cargo/registry/cache
+            ~/.cargo/git/db
+            ~/.cargo/bin
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Install sccache
+        run: |
+          if [ "${{ runner.os }}" = "Linux" ]; then
+            sccache_platform="x86_64-unknown-linux-musl"
+          elif [ "${{ runner.os }}" = "macOS" ]; then
+            sccache_platform="x86_64-apple-darwin"
+          elif [ "${{ runner.os }}" = "Windows" ]; then
+            sccache_platform="x86_64-pc-windows-msvc"
+          else
+            echo "Unsupported platform: ${{ runner.os }}"
+            exit 1
+          fi
+          sccache_file="sccache-v${SCCACHE_VERSION}-${sccache_platform}"
+          sccache_url="https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/${sccache_file}.tar.gz"
+          echo "URL=${sccache_url}"
+          curl -L "$sccache_url" | tar xz
+          mv -f "$sccache_file/sccache" "$RUSTC_WRAPPER"
+          chmod +x "$RUSTC_WRAPPER"
+
+      - name: Install wasm32-unknown-unknown target
+        uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: stable
+          targets: wasm32-unknown-unknown
+
+      - name: Install cargo-component
+        run: |
+          if ! command -v cargo-component || ! cargo-component --version | grep -q $CARGO_COMPONENT_VERSION; then
+            cargo install cargo-component --locked --version $CARGO_COMPONENT_VERSION --force
+          fi
+
+      - name: Build extensions
+        run: cargo component build --release --workspace --target wasm32-unknown-unknown
+
+      - name: Package extensions
+        run: .github/workflows/package.sh
+
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          branch: gh-pages
+          folder: gh-pages
+          commit-message: "Update extensions repository"
+
+      - name: Upload packaged extensions as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: extensions
+          path: gh-pages/extensions/*.mix
+          if-no-files-found: ignore
+
+      - name: Show sccache statistics
+        run: $RUSTC_WRAPPER --show-stats
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 62940c5..e0d2c52 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -1,19 +1,15 @@
 name: Test extensions
 
 on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'src/**'
-      - '.github/workflows/test.yaml'
+  pull_request:
+    branches: ['main']
 
 concurrency:
   group: ${{ github.workflow }}
   cancel-in-progress: true
 
 jobs:
-  build:
+  test:
     name: Test modified extensions
     env:
       CARGO_COMPONENT_VERSION: "0.11.0"
diff --git a/.gitignore b/.gitignore
index ea8c4bf..198c4ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 /target
+
+.idea/