Add a test case for mig tool on darwon platforms

Author: larskanis

test/fixtures/mig_test_rpc.defs

@@ -0,0 +1,8 @@
+#include <mach/std_types.defs>
+#include <mach/mach_types.defs>
+
+subsystem mig_test_ipc 1;
+
+routine mig_test_call(
+                                server_port     : mach_port_t;
+                out             returnvalue     : int);

test/test_mig.rb

@@ -0,0 +1,25 @@
+require 'rake_compiler_dock'
+require 'test/unit'
+
+class TestMigCompile < Test::Unit::TestCase
+  TEST_PLATFORM = ENV["TEST_PLATFORM"]
+
+  def test_mig_compile(platform)
+    omit "only on #{platform} platform" unless TEST_PLATFORM == platform
+    RakeCompilerDock::Starter.sh "mig -header tmp/mig_test_rpc.h -user tmp/mig_test_rpc.c -sheader /dev/null -server /dev/null -I. test/fixtures/mig_test_rpc.defs ", platform: platform
+
+    h_file = File.read("tmp/mig_test_rpc.h")
+    assert_match /Request_mig_test_call/, h_file
+
+    c_file = File.read("tmp/mig_test_rpc.c")
+    assert_match /Reply__mig_test_call/, c_file
+  end
+
+  def test_mig_compile_x86_64_darwin
+    test_mig_compile('x86_64-darwin')
+  end
+
+  def test_mig_compile_arm64_darwin
+    test_mig_compile('arm64-darwin')
+  end
+end