Setup RSpec rake task and wrote spec for MemorySpace (#2)

* Setup RSpec rake task and wrote spec for MemorySpace

* Removed mintest rake task

Rakefile

@@ -1,13 +1,16 @@
 # frozen_string_literal: true
 
 require 'bundler/gem_tasks'
-require 'rake/testtask'
 
-Rake::TestTask.new do |t|
-  t.pattern = 'test/test*.rb'
+begin
+  require 'rspec/core/rake_task'
+  RSpec::Core::RakeTask.new(:spec)
+  task(default: :spec)
+rescue LoadError
+  warn("Couldn't load RSpec gem")
 end
 
-##  Check the syntax of all ruby files
+# Check the syntax of all Ruby files
 task :syntax do
   sh 'find . -name *.rb -type f -exec ruby -c {} \; -exec echo {} \;'
 end

n65.gemspec

@@ -25,4 +25,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'minitest'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rubocop'
+  spec.add_development_dependency 'rspec'
 end

spec/.rubocop.yml

@@ -0,0 +1,4 @@
+inherit_from: ../.rubocop.yml
+
+Metrics/BlockLength:
+  Enabled: false

spec/lib/n65/memory_space_spec.rb

@@ -0,0 +1,107 @@
+# frozen_string_literal: true
+
+require_relative '../../../lib/n65/memory_space'
+
+RSpec.describe(N65::MemorySpace) do
+  describe '.new' do
+    context 'when provided a size and type' do
+      let(:bank) { described_class.new(size, type) }
+      let(:size) { 0x100 }
+      let(:type) { :prog }
+
+      it 'returns a zeroed bank' do
+        expect(bank.emit_bytes.all?(&:zero?)).to eq(true)
+      end
+
+      it 'returns the requested sized bank' do
+        expect(bank.emit_bytes.size).to be(size)
+      end
+    end
+  end
+
+  describe '.create_prog_rom' do
+    context 'when creating a new prog rom' do
+      let(:bank) { described_class.create_prog_rom }
+
+      it 'returns a zeroed bank' do
+        expect(bank.emit_bytes.all?(&:zero?)).to eq(true)
+      end
+
+      it 'returns the correct sized bank' do
+        expect(bank.emit_bytes.size).to eq(0x4000)
+      end
+    end
+  end
+
+  describe '.create_char_rom' do
+    context 'when creating a new prog rom' do
+      let(:bank) { described_class.create_char_rom }
+
+      it 'returns a zeroed bank' do
+        expect(bank.emit_bytes.all?(&:zero?)).to eq(true)
+      end
+
+      it 'returns the correct sized bank' do
+        expect(bank.emit_bytes.size).to eq(0x2000)
+      end
+    end
+  end
+
+  describe '#read' do
+    let(:address) { 0xC100 }
+    let(:mirroed_address) { 0x8100 }
+    let(:bank) { described_class.create_prog_rom }
+    let(:data) { 'hi there'.bytes }
+
+    before { bank.write(address, data) }
+
+    context 'when reading from the bank' do
+      it 'can read back from the 0xC000 base address' do
+        expect(bank.read(address, data.size)).to eq(data)
+      end
+
+      it 'can read back from the 0x8000 mirrored address' do
+        expect(bank.read(mirroed_address, data.size)).to eq(data)
+      end
+    end
+
+    context 'when attempting to read out of bounds' do
+      it 'throws an error' do
+        expect { bank.read(0x0, 0x10) }.to raise_error(described_class::AccessOutsideProgRom)
+      end
+
+      it 'throws an error' do
+        expect { bank.read(0xffff, 0x10) }.to raise_error(described_class::AccessOutsideProgRom)
+      end
+    end
+  end
+
+  describe '#write' do
+    let(:address) { 0xC100 }
+    let(:mirroed_address) { 0x8100 }
+    let(:bank) { described_class.create_prog_rom }
+    let(:data) { 'hi there'.bytes }
+
+    before { bank.write(mirroed_address, data) }
+
+    context 'when reading from the bank' do
+      it 'can read back from the 0xC000 base address' do
+        expect(bank.read(address, data.size)).to eq(data)
+      end
+
+      it 'can read back from the 0x8000 mirrored address' do
+        expect(bank.read(mirroed_address, data.size)).to eq(data)
+      end
+    end
+
+    context 'when attempting to write out of bounds' do
+      it 'throws an error' do
+        expect { bank.write(0x0, data) }.to raise_error(described_class::AccessOutsideProgRom)
+      end
+
+      it 'throws an error' do
+        expect { bank.write(0xffff, data) }.to raise_error(described_class::AccessOutsideProgRom)
+      end
+    end
+  end
+end