1 files changed, 66 insertions, 0 deletions
diff --git a/test/mkmf/test_pkg_config.rb b/test/mkmf/test_pkg_config.rb
new file mode 100644
index 0000000000..f6a960c7d9
--- /dev/null
+++ b/test/mkmf/test_pkg_config.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: false
+require_relative 'base'
+require 'shellwords'
+
+class TestMkmfPkgConfig < TestMkmf
+  PKG_CONFIG = config_string("PKG_CONFIG") {|path| find_executable0(path)}
+
+  def setup
+    super
+
+    if PKG_CONFIG
+      @fixtures_dir = File.join(Dir.pwd, "fixtures")
+      @fixtures_lib_dir = File.join(@fixtures_dir, "lib")
+      @fixtures_inc_dir = File.join(@fixtures_dir, "include")
+
+      FileUtils.mkdir(@fixtures_dir)
+      File.write("fixtures/test1.pc", <<~EOF)
+        libdir=#{@fixtures_lib_dir}
+        includedir=#{@fixtures_inc_dir}
+
+        Name: test1
+        Description: Test for mkmf pkg-config method
+        Version: 1.2.3
+        Libs: -L${libdir} -ltest1-public
+        Libs.private: -ltest1-private
+        Cflags: -I${includedir}/cflags-I --cflags-other
+      EOF
+
+      @pkg_config_path, ENV["PKG_CONFIG_PATH"] = ENV["PKG_CONFIG_PATH"], @fixtures_dir
+    end
+  end
+
+  def teardown
+    if PKG_CONFIG
+      ENV["PKG_CONFIG_PATH"] = @pkg_config_path
+    end
+
+    super
+  end
+
+  def test_pkgconfig_with_option_returns_nil_on_error
+    pend("skipping because pkg-config is not installed") unless PKG_CONFIG
+    assert_nil(pkg_config("package-does-not-exist", "exists"), MKMFLOG)
+  end
+
+  def test_pkgconfig_with_libs_option_returns_output
+    pend("skipping because pkg-config is not installed") unless PKG_CONFIG
+    expected = ["-L#{@fixtures_lib_dir}", "-ltest1-public"].sort
+    actual = pkg_config("test1", "libs").shellsplit.sort
+    assert_equal(expected, actual, MKMFLOG)
+  end
+
+  def test_pkgconfig_with_cflags_option_returns_output
+    pend("skipping because pkg-config is not installed") unless PKG_CONFIG
+    expected = ["--cflags-other", "-I#{@fixtures_inc_dir}/cflags-I"].sort
+    actual = pkg_config("test1", "cflags").shellsplit.sort
+    assert_equal(expected, actual, MKMFLOG)
+  end
+
+  def test_pkgconfig_with_multiple_options
+    pend("skipping because pkg-config is not installed") unless PKG_CONFIG
+    expected = ["-L#{@fixtures_lib_dir}", "-ltest1-public", "-ltest1-private"].sort
+    actual = pkg_config("test1", "libs", "static").shellsplit.sort
+    assert_equal(expected, actual, MKMFLOG)
+  end
+end