diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7f851c4..b871a52 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -39,6 +39,22 @@ jobs:
           working_directory: test/
           compiler: arara
           args: "--verbose"
+      # https://github.com/xu-cheng/latex-action/issues/16
+      - name: Test Action with Github Default Template
+        uses: ./
+        with:
+          # The root LaTeX file to be compiled
+          root_file: test/test.tex
+          # The working directory for the LaTeX engine
+          working_directory: # optional
+          # The LaTeX engine to be invoked
+          compiler: # optional, default is latexmk
+          # Extra arguments to be passed to the LaTeX engine
+          args: # optional, default is -pdf -file-line-error -interaction=nonstopmode
+          # [Deprecated] Install extra packages by tlmgr
+          extra_packages: # optional
+          # Install extra packages by apk
+          extra_system_packages: # optional
       - name: Check pdf files
         run: |
           file test/test.pdf | grep -q ' PDF '
diff --git a/entrypoint.sh b/entrypoint.sh
index dee8dfa..66717d4 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -2,6 +2,15 @@
 
 set -e
 
+warn() {
+  echo "::warning :: $1"
+}
+
+error() {
+  echo "::error :: $1"
+  exit 1
+}
+
 root_file="$1"
 working_directory="$2"
 compiler="$3"
@@ -9,6 +18,16 @@ args="$4"
 extra_packages="$5"
 extra_system_packages="$6"
 
+if [ -z "$root_file" ]; then
+  error "Input 'root_file' is missing."
+fi
+
+if [ -z "$compiler" ] && [ -z "$args" ]; then
+  warn "Input 'compiler' and 'args' are both empty. Reset them to default values."
+  compiler="latexmk"
+  args="-pdf -file-line-error -interaction=nonstopmode"
+fi
+
 if [ -n "$extra_system_packages" ]; then
   for pkg in $extra_system_packages; do
     echo "Install $pkg by apk"
@@ -17,12 +36,16 @@ if [ -n "$extra_system_packages" ]; then
 fi
 
 if [ -n "$extra_packages" ]; then
-  echo "::warning ::Input 'extra_packages' is deprecated. We now build LaTeX document with full TeXLive installed."
+  warn "Input 'extra_packages' is deprecated. We now build LaTeX document with full TeXLive installed."
 fi
 
 if [ -n "$working_directory" ]; then
   cd "$working_directory"
 fi
 
+if [ ! -f "$root_file" ]; then
+  error "File '$root_file' cannot be found from the directory '$PWD'."
+fi
+
 # shellcheck disable=SC2086
 "$compiler" $args "$root_file"