Implement test code for Sisimai::Mail::Memory

spec/sisimai/mail/memory_spec.rb

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+require 'spec_helper'
+require 'sisimai/mail/memory'
+
+describe Sisimai::Mail::Memory do
+  samplemailbox = [
+    './set-of-emails/mailbox/mbox-0',
+    './set-of-emails/maildir/bsd/email-sendmail-01.eml'
+  ]
+  let(:mailobj) { Sisimai::Mail::Memory.new(samples) }
+  let(:mockobj) { Sisimai::Mail::Memory.new(invalid) }
+  emailcontents = nil
+
+  describe 'class method' do
+    describe '.new' do
+      context 'mbox file exists' do
+        messagehandle = File.open(samplemailbox[0], 'r')
+        emailcontents = messagehandle.read
+        messagehandle.close
+        let(:samples) { emailcontents }
+        subject { mailobj }
+        it 'returns Sisimai::Mail::Memory object' do
+          is_expected.to be_a Sisimai::Mail::Memory
+        end
+      end
+
+      context 'argument is not a String' do
+        let(:invalid) { 1 }
+        it 'raises RuntimeError' do
+          expect { mockobj }.to raise_error(RuntimeError)
+        end
+      end
+
+      context 'argument is empty' do
+        let(:invalid) { '' }
+        it 'raises RuntimeError' do
+          expect { mockobj }.to raise_error(RuntimeError)
+        end
+      end
+
+      context 'wrong number of arguments' do
+        it 'raises ArgumentError' do
+          expect { Sisimai::Mail::Memory.new }.to raise_error(ArgumentError)
+          expect { Sisimai::Mail::Memory.new(nil, nil) }.to raise_error(ArgumentError)
+        end
+      end
+    end
+  end
+
+  describe 'instance method' do
+    samplemailbox.each do |b|
+      messagehandle = File.open(samplemailbox[0], 'r')
+      emailcontents = messagehandle.read
+      messagehandle.close
+      let(:samples) { emailcontents }
+      before do
+        mailobj.read
+      end
+      describe '#size' do
+        subject { mailobj.size }
+        it 'returns email size' do
+          is_expected.to be_a Integer
+          is_expected.to be > 90000
+        end
+      end
+      describe '#data' do
+        subject { mailobj.data }
+        it 'returns Array' do
+          is_expected.to be_a Array
+        end
+      end
+      describe '#offset' do
+        subject { mailobj.offset }
+        it 'returns valid offset size' do
+          is_expected.to be_a Integer
+          is_expected.to be > 0
+          is_expected.to be < mailobj.size
+        end
+      end
+
+      describe '#read' do
+        mailbox = Sisimai::Mail::Memory.new(emailcontents)
+        emindex = 0
+        hasread = 0
+
+        while r = mailbox.read do
+          emindex += 1
+          mailtxt  = r
+          hasread += mailtxt.size
+          subject { mailtxt }
+
+          it 'returns valid email text' do
+            is_expected.to be_a String
+            is_expected.to match(/From:\s*/)
+            expect(mailtxt.size).to be > 0
+          end
+          example 'current position is larger than 0' do
+            expect(mailbox.offset).to be > 0
+          end
+        end
+
+        example "the number of emails is #{emindex}" do
+          expect(emindex).to be == 37
+        end
+        example 'loaded size is larger than 0' do
+          expect(hasread).to be > 0
+        end
+      end
+    end
+
+  end
+end
+