Class: Synthra::SnapshotTesting::SnapshotMatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/synthra/snapshot_testing.rb

Overview

RSpec matcher class

Instance Method Summary collapse

Constructor Details

#initialize(schema_name, snapshot_dir:) ⇒ SnapshotMatcher

Returns a new instance of SnapshotMatcher.



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# File 'lib/synthra/snapshot_testing.rb', line 159

def initialize(schema_name, snapshot_dir:)
  @schema_name = schema_name
  @snapshot_dir = snapshot_dir
end

Instance Method Details

#failure_message ⇒ Object 



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# File 'lib/synthra/snapshot_testing.rb', line 177

def failure_message
  "expected generated data to match snapshot for #{@schema_name}"
end

#failure_message_when_negated ⇒ Object 



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# File 'lib/synthra/snapshot_testing.rb', line 181

def failure_message_when_negated
  "expected generated data not to match snapshot for #{@schema_name}"
end

#matches?(actual) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/synthra/snapshot_testing.rb', line 164

def matches?(actual)
  @actual = actual
  path = File.join(@snapshot_dir, "#{@schema_name.downcase}.json")
  
  return false unless File.exist?(path)
  
  @expected = JSON.parse(File.read(path))
  sorted_actual = sort_hash(@actual)
  sorted_expected = sort_hash(@expected)
  
  sorted_actual == sorted_expected
end

#sort_hash(obj) ⇒ Object (private) 



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# File 'lib/synthra/snapshot_testing.rb', line 187

def sort_hash(obj)
  case obj
  when Hash
    obj.sort.to_h.transform_values { |v| sort_hash(v) }
  when Array
    obj.map { |v| sort_hash(v) }
  else
    obj
  end
end