hashr

Hashr is a tiny class makes test on JSON response easier.

The name of hashr come from the awesome ruby gem hashr, though, AFAIK, use original code is not possible because Crystal very different with Ruby in some aspect.

This shard should only be used in spec.

Installation

Add the dependency to your shard.yml:

dependencies:
  hashr:
    github: crystal-china/hashr

Run shards install

Usage

Following is a example use graphql + spec-kemal


require "hashr"
require "../spec_helper"

describe "daily reports" do
  it "query daily report" do
    report = ReportFactory.create

    post_json "/graphql", body: {query: "query { ... }"}

    p! typeof(response.body)  # => String
    
    p! response.body # => "{\"data\":{\"reportQuery\":{\"target\":{\"targetTotalCount\":47,\"processedTotalCount\":44,\"qualifiedTotalCount\":40}}}}"

    response_hash = Hash(String, JSON::Any).from_json(response.body) # => Get a hash like this:
    # {"data" => {
    #                "reportQuery" => {
    #                  "target" => {
    #                    "targetTotalCount" => report.target_total_count,
    #                    "processedTotalCount" => report.processed_total_count,
    #                    "qualifiedTotalCount" => report.qualified_total_count
    #                  }
    #                }
    #              }
    #     }
    
    # Instead, verify on the entire response result, we can verify on specified field only.
    parsed_response = Hashr.new(response)

    # Use nice dot method call.
    target = parsed_response.data.reportQuery.target
    
    target.processedTotalCount.should eq report.processed_total_count
    target.qualifiedTotalCount.should eq report.qualified_total_count
  end
end

You can use Hashr as model object, like this:

it "use hashr as model object" do
    contacts = [
      {
        id:    1,
        first: "billy",
        last:  "zheng",
        phone: "18612385678",
        email: "billy@gmail.com",
      },
      {
        id:    2,
        first: "xuan",
        last:  "zheng",
        phone: "18512345678",
        email: "retired@qq.com",
      },
    ]

    models = contacts.map { |e| Hashr.new(e) }

    models.each do |contact|
      puts "#{contact.first}.#{contact.last}: phone: #{contact.phone}, email: #{contact.email}"
    end
	
	billy = models.first
	billy.phone = "13012345678"
	p billy.name # => 13012345678

Limit

For verify a value is nil, you have to use eq, be_nil not work because Crystal don't allow us redefine #nil? method on any object.

h = {"nilValue" => nil}.to_json
value = Hashr.new({"foo" => JSON.parse(h)})

value.foo.nilValue.should eq nil # => true
value.foo.nilValue.should be_nil    # => false