Add prose tests

lib/mongo/crypt/explicit_encryption_context.rb

@@ -139,7 +139,12 @@ def set_algorithm_opts(options)
 
       def convert_range_opts(range_opts)
         range_opts.dup.tap do |opts|
-          opts[:sparsity] = BSON::Int64.new(opts[:sparsity]) unless opts[:sparsity].is_a?(BSON::Int64)
+          if opts[:sparsity] && !opts[:sparsity].is_a?(BSON::Int64)
+            opts[:sparsity] = BSON::Int64.new(opts[:sparsity])
+          end
+          if opts[:trim_factor]
+            opts[:trimFactor] = opts.delete(:trim_factor)
+          end
         end
       end
     end

spec/integration/client_side_encryption/range_explicit_encryption_prose_spec.rb

@@ -533,5 +533,51 @@
 
     include_examples 'common cases'
   end
+
+  describe 'Range Explicit Encryption applies defaults' do
+    let(:payload_defaults) do
+      client_encryption.encrypt(
+        123,
+        key_id: key1_id,
+        algorithm: 'Range',
+        contention_factor: 0,
+        range_opts: {
+          min: 0,
+          max: 1000
+        }
+      )
+    end
+
+    it 'uses libmongocrypt default' do
+      payload = client_encryption.encrypt(
+        123,
+        key_id: key1_id,
+        algorithm: 'Range',
+        contention_factor: 0,
+        range_opts: {
+          min: 0,
+          max: 1000,
+          sparsity: 2,
+          trim_factor: 6
+        }
+      )
+      expect(payload.to_s.size).to eq(payload_defaults.to_s.size)
+    end
+
+    it 'accepts trim_factor 0' do
+      payload = client_encryption.encrypt(
+        123,
+        key_id: key1_id,
+        algorithm: 'Range',
+        contention_factor: 0,
+        range_opts: {
+          min: 0,
+          max: 1000,
+          trim_factor: 0
+        }
+      )
+      expect(payload.to_s.size).to eq(payload_defaults.to_s.size)
+    end
+  end
 end
 # rubocop:enable RSpec/ExampleLength