More tests of float compatibility

test/test_encoder_compatibility.rb

@@ -50,6 +50,7 @@ def test_encode_float
 
     0.upto(1023) do |e|
       assert_compat(2.0 ** e)
+      assert_compat(2.0 ** -e)
     end
   end
 
@@ -61,6 +62,24 @@ def test_encode_randomized_floats
     end
   end
 
+  def test_float_scientific_threshold
+    assert_implementations_equal do |json|
+      (1.0..).bsearch{ |x| json.dump(x).include?("e") }
+    end
+
+    assert_implementations_equal do |json|
+      (1.0..).bsearch{ |x| json.dump(-x).include?("e") }
+    end
+
+    assert_implementations_equal do |json|
+      (1.0..).bsearch{ |x| json.dump(1.0 / x).include?("e") }
+    end
+
+    assert_implementations_equal do |json|
+      (1.0..).bsearch{ |x| json.dump(-1.0 / x).include?("e") }
+    end
+  end
+
   def test_encode_hash
     assert_compat({})
     assert_compat({ "foo" => "bar" })
@@ -187,10 +206,20 @@ def assert_compat(object)
   end
 
   def assert_dump_equal(object, *args)
-    assert_equal ::JSON.dump(object, *args), RapidJSON::JSONGem.dump(object, *args)
+    assert_implementations_equal do |json|
+      json.dump(object, *args)
+    end
   end
 
   def assert_generate_equal(object, *args)
-    assert_equal ::JSON.generate(object, *args), RapidJSON::JSONGem.generate(object, *args)
+    assert_implementations_equal do |json|
+      json.generate(object, *args)
+    end
+  end
+
+  def assert_implementations_equal(&block)
+    expected = yield(::JSON)
+    actual = yield(RapidJSON::JSONGem)
+    assert_equal expected, actual
   end
 end