Add the first few specs

Coverage for meterpreter and client core, just the bits I'm changing. I
intend to make liberal use of doubles, since they're easier than mocks
and all I care about is the changed behavior. I refuse to fall into a
trap where I need to first spec out aaaaaalllll of Metepreter just to
make this one change.

spec/lib/rex/post/meterpreter/client_core_spec.rb

@@ -0,0 +1,53 @@
+require 'spec_helper'
+require 'rex/post/meterpreter/client_core'
+
+describe Rex::Post::Meterpreter::ClientCore do
+
+  it "should be available" do
+    expect(described_class).to eq(Rex::Post::Meterpreter::ClientCore)
+  end
+
+  describe "#use" do
+
+    before(:each) do
+      @response = double("response")
+      allow(@response).to receive(:result) { 0 }
+      allow(@response).to receive(:each) { [:help] }
+      @client = double("client")
+      allow(@client).to receive(:binary_suffix) { "x64.dll" }
+      allow(@client).to receive(:capabilities) { {:ssl => false, :zlib => false } }
+      allow(@client).to receive(:response_timeout) { 1 }
+      allow(@client).to receive(:send_packet_wait_response) { @response }
+      allow(@client).to receive(:add_extension) { true }
+    end
+
+    let(:client_core) {described_class.new(@client)}
+    it 'should respond to #use' do
+      expect(client_core).to respond_to(:use)
+    end
+
+    context 'with a gemified module' do
+      let(:mod) {"kiwi"}
+      it 'should be available' do
+        expect(client_core.use(mod)).to be_true
+      end
+    end
+
+    context 'with a local module' do
+      let(:mod) {"sniffer"}
+      it 'should be available' do
+        expect(client_core.use(mod)).to be_true
+      end
+    end
+
+    context 'with a missing a module' do
+      let(:mod) {"eaten_by_av"}
+      it 'should be available' do
+        expect { client_core.use(mod) }.to raise_error(TypeError)
+      end
+    end
+
+
+  end
+  
+end

spec/lib/rex/post/meterpreter_spec.rb

@@ -0,0 +1,8 @@
+require 'spec_helper'
+require 'rex/post/meterpreter'
+
+describe MeterpreterBinaries do
+  it 'is available' do
+    expect(described_class).to eq(MeterpreterBinaries)
+  end
+end