ruby-sdk/test/mcp/tool/input_schema_test.rb

# frozen_string_literal: true

require "test_helper"

module MCP
  class Tool
    class InputSchemaTest < ActiveSupport::TestCase
      test "required arguments are converted to strings" do
        input_schema = InputSchema.new(properties: { message: { type: "string" } }, required: [:message])
        assert_equal ["message"], input_schema.schema[:required]
      end

      test "to_h returns a hash representation of the input schema" do
        input_schema = InputSchema.new(properties: { message: { type: "string" } }, required: ["message"])
        assert_equal(
          { type: "object", properties: { message: { type: "string" } }, required: ["message"] },
          input_schema.to_h,
        )
      end

      test "to_h returns a hash representation of the input schema with additionalProperties set to false" do
        input_schema = InputSchema.new(properties: { message: { type: "string" } }, required: ["message"], additionalProperties: false)
        assert_equal(
          { type: "object", properties: { message: { type: "string" } }, required: ["message"], additionalProperties: false },
          input_schema.to_h,
        )
      end

      test "missing_required_arguments returns an array of missing required arguments" do
        input_schema = InputSchema.new(properties: { message: { type: "string" } }, required: ["message"])
        assert_equal ["message"], input_schema.missing_required_arguments({})
      end

      test "missing_required_arguments returns an empty array if no required arguments are missing" do
        input_schema = InputSchema.new(properties: { message: { type: "string" } }, required: ["message"])
        assert_equal([], input_schema.missing_required_arguments({ message: "Hello, world!" }))
      end

      test "valid schema initialization" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        assert_equal({ type: "object", properties: { foo: { type: "string" } }, required: ["foo"] }, schema.to_h)
      end

      test "invalid schema raises argument error" do
        assert_raises(ArgumentError) do
          InputSchema.new(properties: { foo: { type: "invalid_type" } }, required: ["foo"])
        end
      end

      test "schema without required arguments is valid" do
        assert_nothing_raised do
          InputSchema.new(properties: { foo: { type: "string" } })
        end
      end

      test "validate arguments with valid data" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        assert_nil(schema.validate_arguments({ foo: "bar" }))
      end

      test "validate arguments with invalid data" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        assert_raises(InputSchema::ValidationError) do
          schema.validate_arguments({ foo: 123 })
        end
      end

      test "validate arguments with valid data when additionalProperties set to nil (default)" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        assert_nil(schema.validate_arguments({ foo: "bar", extra: 123 }))
      end

      test "validate arguments with valid data when additionalProperties set to true (default)" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"], additionalProperties: true)
        assert_nil(schema.validate_arguments({ foo: "bar", extra: 123 }))
      end

      test "validate arguments with invalid data when additionalProperties set to false" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"], additionalProperties: false)
        assert_raises(InputSchema::ValidationError) do
          schema.validate_arguments({ foo: "bar", extra: 123 })
        end
      end

      test "unexpected errors bubble up from validate_arguments" do
        schema = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])

        JSON::Validator.stub(:fully_validate, ->(*) { raise "unexpected error" }) do
          assert_raises(RuntimeError) do
            schema.validate_arguments({ foo: "bar" })
          end
        end
      end

      test "accepts schemas with $ref references" do
        schema = InputSchema.new(
          properties: {
            foo: { type: "string" },
          },
          definitions: {
            bar: { type: "string" },
          },
          required: ["foo"],
        )
        assert_includes schema.to_h.keys, :definitions
      end

      test "accepts schemas with $ref string key and includes $ref in to_h" do
        schema = InputSchema.new({
          "properties" => {
            "foo" => { "$ref" => "#/definitions/bar" },
          },
          "definitions" => {
            "bar" => { "type" => "string" },
          },
        })
        assert_equal "#/definitions/bar", schema.to_h[:properties][:foo][:$ref]
      end

      test "accepts schemas with $ref symbol key and includes $ref in to_h" do
        schema = InputSchema.new({
          properties: {
            foo: { :$ref => "#/definitions/bar" },
          },
          definitions: {
            bar: { type: "string" },
          },
        })
        assert_equal "#/definitions/bar", schema.to_h[:properties][:foo][:$ref]
      end

      test "== compares two input schemas with the same properties, required fields" do
        schema1 = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        schema2 = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"])
        assert_equal schema1, schema2

        schema3 = InputSchema.new(properties: { bar: { type: "string" } }, required: ["bar"])
        refute_equal schema1, schema3

        schema4 = InputSchema.new(properties: { foo: { type: "string" } }, required: ["bar"])
        refute_equal schema1, schema4

        schema5 = InputSchema.new(properties: { bar: { type: "string" } }, required: ["foo"])
        refute_equal schema1, schema5

        schema6 = InputSchema.new(properties: { foo: { type: "string" } }, required: ["foo"], additionalProperties: false)
        refute_equal schema1, schema6
      end
    end
  end
end