diff options
Diffstat (limited to 'spec/lib/roo/weak_instance_cache_spec.rb')
| -rw-r--r-- | spec/lib/roo/weak_instance_cache_spec.rb | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/spec/lib/roo/weak_instance_cache_spec.rb b/spec/lib/roo/weak_instance_cache_spec.rb new file mode 100644 index 0000000..c2ad9b4 --- /dev/null +++ b/spec/lib/roo/weak_instance_cache_spec.rb @@ -0,0 +1,92 @@ +require 'spec_helper' + +if RUBY_PLATFORM == "java" + require 'java' + java_import 'java.lang.System' +end + +describe Roo::Helpers::WeakInstanceCache do + let(:klass) do + Class.new do + include Roo::Helpers::WeakInstanceCache + + def memoized_data + instance_cache(:@memoized_data) do + "Some Costly Operation #{rand(1000)}" * 1_000 + end + end + end + end + + subject do + klass.new + end + + it 'should be lazy' do + expect(subject.instance_variables).to_not include(:@memoized_data) + data = subject.memoized_data + expect(subject.instance_variables).to include(:@memoized_data) + end + + + it 'should be memoized' do + data = subject.memoized_data + expect(subject.memoized_data).to equal(data) + end + + it 'should recalculate after GC' do + expect(subject.instance_variables).to_not include(:@memoized_data) + GC.disable + subject.memoized_data && nil + expect(subject.instance_variables).to include(:@memoized_data) + + force_gc + expect(subject.instance_variables).to_not include(:@memoized_data) + GC.disable + subject.memoized_data && nil + expect(subject.instance_variables).to include(:@memoized_data) + end + + it 'must remove instance variable' do + expect(subject.instance_variables).to_not include(:@memoized_data) + GC.disable + subject.memoized_data && nil + expect(subject.instance_variables).to include(:@memoized_data) + + force_gc + expect(subject.instance_variables).to_not include(:@memoized_data) + end + + context '#inspect must not raise' do + it 'before calculation' do + expect{subject.inspect}.to_not raise_error + end + it 'after calculation' do + GC.disable + subject.memoized_data && nil + expect{subject.inspect}.to_not raise_error + expect(subject.inspect).to include("Some Costly Operation") + force_gc + end + it 'after GC' do + subject.memoized_data && nil + force_gc + expect(subject.instance_variables).to_not include(:@memoized_data) + expect{subject.inspect}.to_not raise_error + expect(subject.inspect).to_not include("Some Costly Operation") + end + end + + if RUBY_PLATFORM == "java" + def force_gc + System.gc + sleep(0.1) + end + else + def force_gc + GC.start(full_mark: true, immediate_sweep: true) + sleep(0.1) + GC.start(full_mark: true, immediate_sweep: true) + end + end +end
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