New upstream version 2.8.0upstream/2.8.0

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
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+++ 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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