diff --git a/test/truffleruby-graalvm-tests/functions_tests.sh b/test/truffleruby-graalvm-tests/functions_tests.sh
new file mode 100755
index 00000000..85cb3f04
--- /dev/null
+++ b/test/truffleruby-graalvm-tests/functions_tests.sh
@@ -0,0 +1,374 @@
+#!/usr/bin/env bash
+
+. ./test/helper.sh
+. ./share/ruby-install/ruby-install.sh
+
+function setUp()
+{
+	ruby="truffleruby-graalvm"
+	ruby_version="23.1.0"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+}
+
+function test_graalvm_platform_when_os_platform_is_Linux()
+{
+	local original_os_platform="$os_platform"
+	os_platform="Linux"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$graalvm_platform" \
+	             "linux" \
+	             "$graalvm_platform"
+
+	os_platform="$original_os_platform"
+}
+
+function test_graalvm_platform_when_os_platform_is_Darwin()
+{
+	local original_os_platform="$os_platform"
+	os_platform="Darwin"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$graalvm_platform" \
+	             "darwin" \
+	             "$graalvm_platform"
+
+	os_platform="$original_os_platform"
+}
+
+function test_graalvm_arch_when_os_arch_is_x86_64()
+{
+	local original_os_arch="$os_arch"
+	os_arch="x86_64"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$graalvm_arch" \
+	             "amd64" \
+	             "$graalvm_arch"
+
+	os_arch="$original_os_arch"
+}
+
+function test_graalvm_arch_when_os_arch_is_aarch64()
+{
+	local original_os_arch="$os_arch"
+	os_arch="aarch64"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$graalvm_arch" \
+	             "aarch64" \
+	             "$graalvm_arch"
+
+	os_arch="$original_os_arch"
+}
+
+function test_graalvm_arch_when_os_arch_is_arm64()
+{
+	local original_os_arch="$os_arch"
+	os_arch="arm64"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$graalvm_arch" \
+	             "aarch64" \
+	             "$graalvm_arch"
+
+	os_arch="$original_os_arch"
+}
+
+function test_truffleruby_major()
+{
+	assertEquals "did not correctly set \$truffleruby_major" \
+	             "23" \
+	             "$truffleruby_major"
+}
+
+function test_truffleruby_without_major()
+{
+	assertEquals "did not correctly set \$truffleruby_without_major" \
+	             "1.0" \
+	             "$truffleruby_without_major"
+}
+
+function test_truffleruby_minor()
+{
+	assertEquals "did not correctly set \$truffleruby_minor" \
+	             "1" \
+	             "$truffleruby_minor"
+}
+
+function test_ruby_dir_name_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_dir_name" \
+	             "graalvm-jdk-17.0.7+8.1" \
+	             "$ruby_dir_name"
+}
+
+function test_ruby_dir_name_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_dir_name" \
+	             "truffleruby-$ruby_version-${graalvm_platform/darwin/macos}-$graalvm_arch" \
+	             "$ruby_dir_name"
+}
+
+function test_ruby_dir_name_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.1.0"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_dir_name" \
+	             "graalvm-ce-java11-$ruby_version" \
+	             "$ruby_dir_name"
+}
+
+function test_ruby_archive_default_value_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+	unset ruby_archive
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not preserve the \$ruby_archive value" \
+	             "graalvm-jdk-17.0.7_${graalvm_platform/darwin/macos}-${graalvm_arch/amd64/x64}_bin.tar.gz" \
+	             "$ruby_archive"
+}
+
+function test_ruby_archive_default_value_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	unset ruby_archive
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_archive value" \
+	             "truffleruby-jvm-$ruby_version-${graalvm_platform/darwin/macos}-$graalvm_arch.tar.gz" \
+	             "$ruby_archive"
+}
+
+function test_ruby_archive_default_value_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.1.0"
+	unset ruby_archive
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_archive value" \
+	             "graalvm-ce-java11-$graalvm_platform-$graalvm_arch-$ruby_version.tar.gz" \
+	             "$ruby_archive"
+}
+
+function test_ruby_archive_when_its_already_set_and_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+	ruby_archive="truffleruby-graalvm-custom-1.2.3.tar.bz2"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_archive" \
+	             "truffleruby-graalvm-custom-1.2.3.tar.bz2" \
+	             "$ruby_archive"
+}
+
+function test_ruby_archive_when_its_already_set_and_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	ruby_archive="truffleruby-graalvm-custom-1.2.3.tar.bz2"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_archive" \
+	             "truffleruby-graalvm-custom-1.2.3.tar.bz2" \
+	             "$ruby_archive"
+}
+
+function test_ruby_archive_when_its_already_set_and_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.0.0"
+	ruby_archive="truffleruby-graalvm-custom-1.2.3.tar.bz2"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_archive" \
+	             "truffleruby-graalvm-custom-1.2.3.tar.bz2" \
+	             "$ruby_archive"
+}
+
+function test_ruby_mirror_default_value_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+	unset ruby_mirror
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_mirror" \
+	             "https://download.oracle.com/graalvm/17/archive" \
+	             "$ruby_mirror"
+}
+
+function test_ruby_mirror_default_value_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	unset ruby_mirror
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_mirror" \
+	             "https://github.com/oracle/truffleruby/releases/download" \
+	             "$ruby_mirror"
+}
+
+function test_ruby_mirror_default_value_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.1.0"
+	unset ruby_mirror
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not correctly set \$ruby_mirror" \
+	             "https://github.com/graalvm/graalvm-ce-builds/releases/download" \
+	             "$ruby_mirror"
+}
+
+function test_ruby_mirror_when_its_already_set_and_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	ruby_mirror="https://example.com/pub/truffleruby-graalvm"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_mirror value" \
+	             "https://example.com/pub/truffleruby-graalvm" \
+	             "$ruby_mirror"
+}
+
+function test_ruby_mirror_when_its_already_set_and_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="22.0.0"
+	ruby_mirror="https://example.com/pub/truffleruby-graalvm"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_mirror value" \
+	             "https://example.com/pub/truffleruby-graalvm" \
+	             "$ruby_mirror"
+}
+
+function test_ruby_url_default_value_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+	unset ruby_mirror ruby_url
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_url" \
+	             "https://download.oracle.com/graalvm/17/archive/$ruby_archive" \
+	             "$ruby_url"
+}
+
+function test_ruby_url_default_value_when_ruby_version_is_greater_or_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	unset ruby_mirror ruby_url
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_url" \
+	             "https://github.com/oracle/truffleruby/releases/download/graal-$ruby_version/$ruby_archive" \
+	             "$ruby_url"
+}
+
+function test_ruby_url_default_value_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.1.0"
+	unset ruby_mirror ruby_url
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not correctly set \$ruby_url" \
+	             "https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-$ruby_version/$ruby_archive" \
+	             "$ruby_url"
+}
+
+function test_ruby_url_when_its_already_set_and_when_ruby_version_is_23_0_0()
+{
+	ruby_version="23.0.0"
+	ruby_url="https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh" >/dev/null
+
+	assertEquals "did not preserve the \$ruby_url value" \
+	             "https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz" \
+	             "$ruby_url"
+}
+
+function test_ruby_url_when_its_already_set_and_when_ruby_version_is_greater_equal_to_23_1_0()
+{
+	ruby_version="23.1.0"
+	ruby_url="https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_url value" \
+	             "https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz" \
+	             "$ruby_url"
+}
+
+function test_ruby_url_when_its_already_set_and_when_ruby_version_is_less_than_23_0_0()
+{
+	ruby_version="22.0.0"
+	ruby_url="https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz"
+
+	source "$ruby_install_dir/functions.sh"
+	source "$ruby_install_dir/truffleruby-graalvm/functions.sh"
+
+	assertEquals "did not preserve the \$ruby_url value" \
+	             "https://example.com/pub/truffleruby-graalvm/truffleruby-graalvm-1.2.3.tar.gz" \
+	             "$ruby_url"
+}
+
+function tearDown()
+{
+	unset ruby ruby_version ruby_version_family ruby_archive ruby_dir_name \
+	      ruby_mirror ruby_url
+}
+
+SHUNIT_PARENT=$0 . $SHUNIT2