test/test_iso_639.rb in iso-639-0.2.6 vs test/test_iso_639.rb in iso-639-0.2.7

@@ -88,6 +88,42 @@
     assert_equal(
       [["ypk", "", "", "Yupik languages", "yupik, langues"]],
       ISO_639.search("yupik, langues")
     )
   end
+
+  it "should error when attempting to change immutable ISO_639_2" do
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_2 << ["test", "array"]
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_2[0] = []
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_2[0][1] = ""
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_2[0][1].upcase!
+    end
+  end
+
+  it "should error when attempting to change immutable ISO_639_1" do
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_1 << ["test", "array"]
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_1[0] = []
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_1[0][1] = ""
+    end
+
+    assert_raises RuntimeError do
+      ISO_639::ISO_639_1[0][1].upcase!
+    end
+  end
 end