Add simple testing

Author: kojix2

test/fixtures/example.h5

@@ -18,4 +18,19 @@ class HDF5Test < Test::Unit::TestCase
     assert_equal(10, minor.read_int)
     assert_kind_of(Integer, release.read_int)
   end
+
+  test 'example' do
+    f = HDF5::File.new(File.join(__dir__, 'fixtures', 'example.h5'))
+    assert_equal(%w[foo], f.list_entries)
+    g = f['foo']
+    assert_equal(%w[bar_float bar_int], g.list_datasets)
+    d = g['bar_float']
+    assert_equal([10], d.shape)
+    assert_equal(:H5T_FLOAT, d.dtype)
+    assert_equal([1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0], d.read)
+    d = g['bar_int']
+    assert_equal([10], d.shape)
+    assert_equal(:H5T_INTEGER, d.dtype)
+    assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], d.read)
+  end
 end