test/test_all.rb in interpolate-0.2.1 vs test/test_all.rb in interpolate-0.2.2

@@ -19,20 +19,20 @@
       6 => 0.6,
       7 => 0.7,
       8 => 0.8,
       9 => 0.9,
       10 => 1
-    }
+    }.freeze
 
     array_points = {
       100 => [1,   10,  100],
       200 => [5,   50,  500],
       500 => [10, 100, 1000]
-    }
+    }.freeze
 
-    @dec_gradient = Interpolation.new(decimal_points)
-    @array_gradient = Interpolation.new(array_points)
+    @dec_gradient = Interpolation.new(decimal_points).freeze
+    @array_gradient = Interpolation.new(array_points).freeze
   end
 
 
   def test_bad_points
     bad_points = {
@@ -130,9 +130,18 @@
 
   def test_array_values
     assert_equal(@array_gradient.at(150), [3, 30, 300])
     assert_equal(@array_gradient.at(200), [5, 50, 500])
     assert_equal(@array_gradient.at(350), [7.5, 75, 750])
+  end
+  
+  def test_frozen_points
+    a = @array_gradient.at(200)
+    assert_nothing_raised RuntimeError do
+      a[0] = 10
+      a[1] = 70
+      a[2] = 100
+    end
   end
 
 end