1 files changed, 37 insertions, 0 deletions
diff --git a/jni/ruby/test/mkmf/test_constant.rb b/jni/ruby/test/mkmf/test_constant.rb
new file mode 100644
index 0000000..fd1f940
--- /dev/null
+++ b/jni/ruby/test/mkmf/test_constant.rb
@@ -0,0 +1,37 @@
+require_relative 'base'
+
+class TestMkmf
+  class TestTryConstant < TestMkmf
+    def test_simple
+      assert_equal( 0, mkmf {try_constant("0")}, MKMFLOG)
+      assert_equal( 1, mkmf {try_constant("1")}, MKMFLOG)
+      assert_equal(-1, mkmf {try_constant("-1")}, MKMFLOG)
+    end
+
+    def test_sizeof
+      assert_equal(config_value("SIZEOF_INT").to_i, mkmf {try_constant("sizeof(int)")}, MKMFLOG)
+      assert_equal(config_value("SIZEOF_LONG").to_i, mkmf {try_constant("sizeof(long)")}, MKMFLOG)
+      assert_equal(config_value("SIZEOF_VOIDP").to_i, mkmf {try_constant("sizeof(void*)")}, MKMFLOG)
+      assert_equal(config_value("SIZEOF_VALUE").to_i, mkmf {try_constant("sizeof(Qnil)")}, MKMFLOG)
+    end
+
+    def test_long
+      sizeof_int = config_value("SIZEOF_INT").to_i
+      sizeof_long = config_value("SIZEOF_LONG").to_i
+      if sizeof_long > sizeof_int
+        type = 'long'
+      else
+        sizeof_long_long = config_value("SIZEOF_LONG_LONG").to_i
+        return if !sizeof_long_long or sizeof_long_long <= sizeof_int
+        type = 'LONG_LONG'
+      end
+
+      decl = "#define CONFTEST_VALUE (unsigned #{type})(((unsigned #{type})1)<<(CHAR_BIT*sizeof(int)))"
+      assert_operator(mkmf {try_constant("CONFTEST_VALUE", [[decl]])}, :>, 0, MKMFLOG)
+    end
+
+    def test_large_unsigned
+      assert_operator(mkmf {try_constant("1U<<(CHAR_BIT*sizeof(int)-1)")}, :>, 0, MKMFLOG)
+    end
+  end
+end