diff --git a/bin/composer_install.sh b/bin/composer_install.sh
index fbbd39c..41e84f5 100755
--- a/bin/composer_install.sh
+++ b/bin/composer_install.sh
@@ -28,5 +28,6 @@ if [ -n "${working_directory}" ]; then
     composer_options+=("--working-dir" "${working_directory}")
 fi
 
-echo "::debug::Using the following Composer command: 'composer ${composer_command} ${composer_options[*]}'"
-"${php_path}" "${composer_path}" "${composer_command}" "${composer_options[@]}"
+full_command="${composer_path} ${composer_command} ${composer_options[*]}"
+echo "::debug::Using the following Composer command: '${full_command}'"
+$full_command
diff --git a/tests/expect/composer_install_18.exp b/tests/expect/composer_install_18.exp
new file mode 100755
index 0000000..b862436
--- /dev/null
+++ b/tests/expect/composer_install_18.exp
@@ -0,0 +1,13 @@
+#!/usr/bin/env -S expect -f
+
+set timeout 3
+spawn ../../bin/composer_install.sh "" "" "" "" "../fixtures/composer.phar" "composer.lock"
+match_max 100000
+
+expect "::debug::Using the following Composer command: '../fixtures/composer.phar install --no-interaction --no-progress --ansi'"
+expect "Installing dependencies"
+expect "Generating autoload files"
+expect eof
+
+# Clean up
+file delete -force vendor
diff --git a/tests/expect/composer_install_19.exp b/tests/expect/composer_install_19.exp
new file mode 100755
index 0000000..ca326de
--- /dev/null
+++ b/tests/expect/composer_install_19.exp
@@ -0,0 +1,15 @@
+#!/usr/bin/env -S expect -f
+
+set timeout 3
+spawn ../../bin/composer_install.sh "" "" "../fixtures/no-lock-file" "" "" ""
+match_max 100000
+
+expect "::debug::Using the following Composer command: '*/composer update --no-interaction --no-progress --ansi --working-dir ../fixtures/no-lock-file'"
+expect "Updating dependencies"
+expect "Writing lock file"
+expect "Generating autoload files"
+expect eof
+
+# Clean up
+file delete -force ../fixtures/no-lock-file/vendor
+file delete -force ../fixtures/no-lock-file/composer.lock
diff --git a/tests/expect/composer_paths_09.exp b/tests/expect/composer_paths_09.exp
new file mode 100755
index 0000000..953b5a0
--- /dev/null
+++ b/tests/expect/composer_paths_09.exp
@@ -0,0 +1,17 @@
+#!/usr/bin/env -S expect -f
+
+set timeout 3
+spawn ../../bin/composer_paths.sh "../fixtures/composer.phar"
+match_max 100000
+
+expect "::debug::Composer path is '../fixtures/composer.phar'\r
+::debug::Composer version 2.2.2 2021-12-29 14:15:27\r
+::debug::Composer cache directory found at '*'\r
+::debug::File composer.json found at './composer.json'\r
+::debug::File composer.lock path computed as './composer.lock'\r
+::set-output name=command::../fixtures/composer.phar\r
+::set-output name=cache-dir::*\r
+::set-output name=json::./composer.json\r
+::set-output name=lock::./composer.lock\r
+"
+expect eof
diff --git a/tests/fixtures/composer.phar b/tests/fixtures/composer.phar
new file mode 100755
index 0000000..6c9a92d
Binary files /dev/null and b/tests/fixtures/composer.phar differ