diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8546d42..b2a978c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,3 +25,48 @@ jobs:
             @semantic-release/git@9.0.0
         env:
           GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+
+  os-test:
+    runs-on: ${{ matrix.os  }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+      - name: Output
+        run: |
+          echo "Get author info"
+          echo " - ${{ env.GIT_COMMIT_AUTHOR }}"
+          echo " - ${{ env.GIT_COMMIT_AUTHOR_NAME }}"
+          echo " - ${{ env.GIT_COMMIT_AUTHOR_EMAIL }}"
+          echo "Get committer info"
+          echo " - ${{ env.GIT_COMMIT_COMMITTER }}"
+          echo " - ${{ env.GIT_COMMIT_COMMITTER_NAME }}"
+          echo " - ${{ env.GIT_COMMIT_COMMITTER_EMAIL }}"
+          echo "Get message info"
+          echo " - ${{ env.GIT_COMMIT_MESSAGE_SUBJECT }}"
+          echo " - ${{ env.GIT_COMMIT_MESSAGE_SUBJECT_SANITIZED }}"
+          echo " - ${{ env.GIT_COMMIT_MESSAGE_BODY }}"
+
+  win-test:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+      - name: Output
+        run: |
+          echo "Get author info"
+          echo " - $env:GIT_COMMIT_AUTHOR"
+          echo " - $env:GIT_COMMIT_AUTHOR_NAME"
+          echo " - $env:GIT_COMMIT_AUTHOR_EMAIL"
+          echo "Get committer info"
+          echo " - $env:GIT_COMMIT_COMMITTER"
+          echo " - $env:GIT_COMMIT_COMMITTER_NAME"
+          echo " - $env:GIT_COMMIT_COMMITTER_EMAIL"
+          echo "Get message info"
+          echo " - $env:GIT_COMMIT_MESSAGE_SUBJECT"
+          echo " - $env:GIT_COMMIT_MESSAGE_SUBJECT_SANITIZED"
+          echo " - $env:GIT_COMMIT_MESSAGE_BODY"
diff --git a/entrypoint.sh b/entrypoint.sh
index f8fb6d3..017a24e 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,4 +1,4 @@
-#!/bin/sh -l
+#!/bin/bash
 
 TEMPLATE_AUTHOR_FORMAT="%an <%ae>"
 TEMPLATE_AUTHOR_NAME_FORMAT="%an"
@@ -19,15 +19,17 @@ git_log_format() {
 }
 
 {
-  echo "GIT_COMMIT_AUTHOR=$(git_log_format "$TEMPLATE_AUTHOR_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_AUTHOR_NAME=$(git_log_format "$TEMPLATE_AUTHOR_NAME_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_AUTHOR_EMAIL=$(git_log_format "$TEMPLATE_AUTHOR_EMAIL_FORMAT" "HEAD")"
+  echo "GIT_COMMIT_AUTHOR=$(git_log_format "${TEMPLATE_AUTHOR_FORMAT}" "HEAD")"
+  echo "GIT_COMMIT_AUTHOR_NAME=$(git_log_format "${TEMPLATE_AUTHOR_NAME_FORMAT}" "HEAD")"
+  echo "GIT_COMMIT_AUTHOR_EMAIL=$(git_log_format "${TEMPLATE_AUTHOR_EMAIL_FORMAT}" "HEAD")"
 
-  echo "GIT_COMMIT_COMMITTER=$(git_log_format "$TEMPLATE_COMMITTER_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_COMMITTER_NAME=$(git_log_format "$TEMPLATE_COMMITTER_NAME_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_COMMITTER_EMAIL=$(git_log_format "$TEMPLATE_COMMITTER_EMAIL_FORMAT" "HEAD")"
+  echo "GIT_COMMIT_COMMITTER=$(git_log_format "${TEMPLATE_COMMITTER_FORMAT}" "HEAD")"
+  echo "GIT_COMMIT_COMMITTER_NAME=$(git_log_format "${TEMPLATE_COMMITTER_NAME_FORMAT}" "HEAD")"
+  echo "GIT_COMMIT_COMMITTER_EMAIL=$(git_log_format "${TEMPLATE_COMMITTER_EMAIL_FORMAT}" "HEAD")"
 
-  echo "GIT_COMMIT_MESSAGE_SUBJECT=$(git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_MESSAGE_SUBJECT_SANITIZED=$(git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_SANITIZED_FORMAT" "HEAD")"
-  echo "GIT_COMMIT_MESSAGE_BODY_BODY="$(git_log_format "$TEMPLATE_COMMIT_MESSAGE_BODY_FORMAT" "HEAD")""
+  echo "GIT_COMMIT_MESSAGE_SUBJECT=$(git_log_format "${TEMPLATE_COMMIT_MESSAGE_SUBJECT_FORMAT}" "HEAD")"
+  echo "GIT_COMMIT_MESSAGE_SUBJECT_SANITIZED=$(git_log_format "${TEMPLATE_COMMIT_MESSAGE_SUBJECT_SANITIZED_FORMAT}" "HEAD")"
+  echo 'GIT_COMMIT_MESSAGE_BODY<<EOF'
+  git_log_format "${TEMPLATE_COMMIT_MESSAGE_BODY_FORMAT}" "HEAD"
+  echo 'EOF'
 } >>"$GITHUB_ENV"
diff --git a/tests/git_log_format.bats b/tests/git_log_format.bats
index 60db246..502e459 100644
--- a/tests/git_log_format.bats
+++ b/tests/git_log_format.bats
@@ -2,7 +2,7 @@
 
 apk add --no-cache git > /dev/null
 
-TEST_COMMIT_SHA=9f2cc79
+TEST_COMMIT_SHA=f554bec
 
 # Load git_log_format function
 source entrypoint.sh > /dev/null 2>&1
@@ -32,15 +32,24 @@ source entrypoint.sh > /dev/null 2>&1
 }
 
 @test "git_log_format: message subject" {
-  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_FORMAT" "build: prepare github action"
+  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_FORMAT" "ci: create a commit with multiple lines"
 }
 
 @test "git_log_format: message subject sanitized" {
-  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_SANITIZED_FORMAT" "build-prepare-github-action"
+  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_SUBJECT_SANITIZED_FORMAT" "ci-create-a-commit-with-multiple-lines"
 }
 
 @test "git_log_format: message body" {
-  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_BODY_FORMAT" ""
+  BODY=$(cat <<-END
+Line 1
+Line 2
+Line 3
+Line 4
+
+Bottom line
+END
+)
+  test_git_log_format "$TEMPLATE_COMMIT_MESSAGE_BODY_FORMAT" "$BODY"
 }
 
 test_git_log_format() {