Class: RSpec::Memory::Matchers::LimitAllocations

Inherits:
Object
  • Object
show all
Includes:
RSpec::Matchers::Composable
Defined in:
lib/rspec/memory/matchers/limit_allocations.rb

Instance Method Summary collapse

Constructor Details

#initialize(allocations = {}, count: nil, size: nil) ⇒ LimitAllocations

Returns a new instance of LimitAllocations.



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# File 'lib/rspec/memory/matchers/limit_allocations.rb', line 32

def initialize(allocations = {}, count: nil, size: nil)
	@count = count
	@size = size
	
	@allocations = {}
	@errors = []
	
	allocations.each do |klass, count|
		self.of(klass, count: count)
	end
end

Instance Method Details

#failure_message ⇒ Object 



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# File 'lib/rspec/memory/matchers/limit_allocations.rb', line 103

def failure_message
	"exceeded allocation limit: #{@errors.join(', ')}"
end

#matches?(given_proc) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rspec/memory/matchers/limit_allocations.rb', line 67

def matches?(given_proc)
	return true unless trace = Trace.capture(@allocations.keys, &given_proc)
	
	if @count or @size
		# If the spec specifies a total limit, we have a limit which we can enforce which takes all allocations into account:
		total = trace.total
		
		check(total.count, @count) do |expected|
			@errors << "allocated #{total.count} instances, #{total.size} bytes, #{expected} instances"
		end if @count
		
		check(total.size, @size) do |expected|
			@errors << "allocated #{total.count} instances, #{total.size} bytes, #{expected} bytes"
		end if @size
	else
		# Otherwise unspecified allocations are considered an error:
		trace.ignored.each do |klass, allocation|
			@errors << "allocated #{allocation.count} #{klass} instances, #{allocation.size} bytes, but it was not specified"
		end
	end
	
	trace.allocated.each do |klass, allocation|
		next unless acceptable = @allocations[klass]
		
		check(allocation.count, acceptable[:count]) do |expected|
			@errors << "allocated #{allocation.count} #{klass} instances, #{allocation.size} bytes, #{expected} instances"
		end
		
		check(allocation.size, acceptable[:size]) do |expected|
			@errors << "allocated #{allocation.count} #{klass} instances, #{allocation.size} bytes, #{expected} bytes"
		end
	end
	
	return @errors.empty?
end

#of(klass, **limits) ⇒ Object 



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# File 'lib/rspec/memory/matchers/limit_allocations.rb', line 48

def of(klass, **limits)
	@allocations[klass] = limits
	
	return self
end

#supports_block_expectations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rspec/memory/matchers/limit_allocations.rb', line 44

def supports_block_expectations?
	true
end