[ruby/fiddle] test memory-view: ensure releasing in test

It's for avoiding calling release on exit via GC. If it's happen, Ruby
will be crashed because Fiddle::MemoryView's finalizer may refer other
Ruby object. In exit phrase, the referred Ruby object may be already
freed.

02915f13de

test/fiddle/test_memory_view.rb

@@ -34,6 +34,7 @@ module Fiddle
       str = Marshal.load(Marshal.dump("hello world"))
       ptr = Pointer[str]
       mview = MemoryView.new(ptr)
+      begin
         assert_same(ptr, mview.obj)
         assert_equal(str.bytesize, mview.byte_size)
         assert_equal(true, mview.readonly?)
@@ -46,6 +47,9 @@ module Fiddle
 
         codes = str.codepoints
         assert_equal(codes, (0...str.bytesize).map {|i| mview[i] })
+      ensure
+        mview.release
+      end
     end
 
     def test_memory_view_multi_dimensional
@@ -57,6 +61,7 @@ module Fiddle
       shape = [3, 4]
       md = MemoryViewTestUtils::MultiDimensionalView.new(buf, "l!", shape, nil)
       mview = Fiddle::MemoryView.new(md)
+      begin
         assert_equal(buf.bytesize, mview.byte_size)
         assert_equal("l!", mview.format)
         assert_equal(Fiddle::SIZEOF_LONG, mview.item_size)
@@ -68,6 +73,9 @@ module Fiddle
         assert_equal(4, mview[0, 3])
         assert_equal(6, mview[1, 1])
         assert_equal(10, mview[2, 1])
+      ensure
+        mview.release
+      end
     end
 
     def test_memory_view_multi_dimensional_with_strides
@@ -79,6 +87,7 @@ module Fiddle
       strides = [4*Fiddle::SIZEOF_LONG*2, Fiddle::SIZEOF_LONG*2]
       md = MemoryViewTestUtils::MultiDimensionalView.new(buf, "l!", shape, strides)
       mview = Fiddle::MemoryView.new(md)
+      begin
         assert_equal("l!", mview.format)
         assert_equal(Fiddle::SIZEOF_LONG, mview.item_size)
         assert_equal(buf.bytesize, mview.byte_size)
@@ -90,6 +99,9 @@ module Fiddle
         assert_equal(5, mview[0, 2])
         assert_equal(9, mview[1, 0])
         assert_equal(15, mview[1, 3])
+      ensure
+        mview.release
+      end
     end
 
     def test_memory_view_multi_dimensional_with_multiple_members
@@ -101,6 +113,7 @@ module Fiddle
       strides = [4*Fiddle::SIZEOF_SHORT*2, Fiddle::SIZEOF_SHORT*2]
       md = MemoryViewTestUtils::MultiDimensionalView.new(buf, "ss", shape, strides)
       mview = Fiddle::MemoryView.new(md)
+      begin
         assert_equal("ss", mview.format)
         assert_equal(Fiddle::SIZEOF_SHORT*2, mview.item_size)
         assert_equal(buf.bytesize, mview.byte_size)
@@ -112,6 +125,9 @@ module Fiddle
         assert_equal([5, 6], mview[0, 2])
         assert_equal([-1, -2], mview[1, 0])
         assert_equal([-7, -8], mview[1, 3])
+      ensure
+        mview.release
+      end
     end
 
     def test_export
@@ -135,9 +151,13 @@ module Fiddle
       data = "\u{3042}"
       ptr = Pointer[data]
       mview = MemoryView.new(ptr)
+      begin
         string = mview.to_s
         assert_equal([data.b, true],
                      [string, string.frozen?])
+      ensure
+        mview.release
+      end
     end
   end
 end