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diff --git a/spec/unit/api_client_spec_v0.rb b/spec/unit/api_client_spec_v0.rb
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+#
+# Author:: Adam Jacob (<adam@opscode.com>)
+# Copyright:: Copyright (c) 2008 Opscode, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'spec_helper'
+
+require 'chef/api_client_v0'
+require 'tempfile'
+
+describe Chef::ApiClientV0 do
+  before(:each) do
+    @client = Chef::ApiClientV0.new
+  end
+
+  it "has a name attribute" do
+    @client.name("ops_master")
+    expect(@client.name).to eq("ops_master")
+  end
+
+  it "does not allow spaces in the name" do
+    expect { @client.name "ops master" }.to raise_error(ArgumentError)
+  end
+
+  it "only allows string values for the name" do
+    expect { @client.name Hash.new }.to raise_error(ArgumentError)
+  end
+
+  it "has an admin flag attribute" do
+    @client.admin(true)
+    expect(@client.admin).to be_truthy
+  end
+
+  it "defaults to non-admin" do
+    expect(@client.admin).to be_falsey
+  end
+
+  it "allows only boolean values for the admin flag" do
+    expect { @client.admin(false) }.not_to raise_error
+    expect { @client.admin(Hash.new) }.to raise_error(ArgumentError)
+  end
+
+  it "has a 'validator' flag attribute" do
+    @client.validator(true)
+    expect(@client.validator).to be_truthy
+  end
+
+  it "defaults to non-validator" do
+    expect(@client.validator).to be_falsey
+  end
+
+  it "allows only boolean values for the 'validator' flag" do
+    expect { @client.validator(false) }.not_to raise_error
+    expect { @client.validator(Hash.new) }.to raise_error(ArgumentError)
+  end
+
+  it "has a public key attribute" do
+    @client.public_key("super public")
+    expect(@client.public_key).to eq("super public")
+  end
+
+  it "accepts only String values for the public key" do
+    expect { @client.public_key "" }.not_to raise_error
+    expect { @client.public_key Hash.new }.to raise_error(ArgumentError)
+  end
+
+
+  it "has a private key attribute" do
+    @client.private_key("super private")
+    expect(@client.private_key).to eq("super private")
+  end
+
+  it "accepts only String values for the private key" do
+    expect { @client.private_key "" }.not_to raise_error
+    expect { @client.private_key Hash.new }.to raise_error(ArgumentError)
+  end
+
+  describe "when serializing to JSON" do
+    before(:each) do
+      @client.name("black")
+      @client.public_key("crowes")
+      @json = @client.to_json
+    end
+
+    it "serializes as a JSON object" do
+      expect(@json).to match(/^\{.+\}$/)
+    end
+
+    it "includes the name value" do
+      expect(@json).to include(%q{"name":"black"})
+    end
+
+    it "includes the public key value" do
+      expect(@json).to include(%{"public_key":"crowes"})
+    end
+
+    it "includes the 'admin' flag" do
+      expect(@json).to include(%q{"admin":false})
+    end
+
+    it "includes the 'validator' flag" do
+      expect(@json).to include(%q{"validator":false})
+    end
+
+    it "includes the private key when present" do
+      @client.private_key("monkeypants")
+      expect(@client.to_json).to include(%q{"private_key":"monkeypants"})
+    end
+
+    it "does not include the private key if not present" do
+      expect(@json).not_to include("private_key")
+    end
+
+    include_examples "to_json equalivent to Chef::JSONCompat.to_json" do
+      let(:jsonable) { @client }
+    end
+  end
+
+  describe "when deserializing from JSON (string) using ApiClient#from_json" do
+    let(:client_string) do
+      "{\"name\":\"black\",\"public_key\":\"crowes\",\"private_key\":\"monkeypants\",\"admin\":true,\"validator\":true}"
+    end
+
+    let(:client) do
+      Chef::ApiClientV0.from_json(client_string)
+    end
+
+    it "does not require a 'json_class' string" do
+      expect(Chef::JSONCompat.parse(client_string)["json_class"]).to eq(nil)
+    end
+
+    it "should deserialize to a Chef::ApiClientV0 object" do
+      expect(client).to be_a_kind_of(Chef::ApiClientV0)
+    end
+
+    it "preserves the name" do
+      expect(client.name).to eq("black")
+    end
+
+    it "preserves the public key" do
+      expect(client.public_key).to eq("crowes")
+    end
+
+    it "preserves the admin status" do
+      expect(client.admin).to be_truthy
+    end
+
+    it "preserves the 'validator' status" do
+      expect(client.validator).to be_truthy
+    end
+
+    it "includes the private key if present" do
+      expect(client.private_key).to eq("monkeypants")
+    end
+  end
+
+  describe "when deserializing from JSON (hash) using JSONCompat#from_json" do
+    let(:client_hash) do
+      {
+        "name" => "black",
+        "public_key" => "crowes",
+        "private_key" => "monkeypants",
+        "admin" => true,
+        "validator" => true,
+        "json_class" => "Chef::ApiClientV0"
+      }
+    end
+
+    let(:client) do
+      Chef::JSONCompat.from_json(Chef::JSONCompat.to_json(client_hash))
+    end
+
+    it "should deserialize to a Chef::ApiClientV0 object" do
+      expect(client).to be_a_kind_of(Chef::ApiClientV0)
+    end
+
+    it "preserves the name" do
+      expect(client.name).to eq("black")
+    end
+
+    it "preserves the public key" do
+      expect(client.public_key).to eq("crowes")
+    end
+
+    it "preserves the admin status" do
+      expect(client.admin).to be_truthy
+    end
+
+    it "preserves the 'validator' status" do
+      expect(client.validator).to be_truthy
+    end
+
+    it "includes the private key if present" do
+      expect(client.private_key).to eq("monkeypants")
+    end
+  end
+
+  describe "when loading from JSON" do
+    before do
+    end
+
+    before(:each) do
+      client = {
+      "name" => "black",
+      "clientname" => "black",
+      "public_key" => "crowes",
+      "private_key" => "monkeypants",
+      "admin" => true,
+      "validator" => true,
+      "json_class" => "Chef::ApiClientV0"
+      }
+      @http_client = double("Chef::REST mock")
+      allow(Chef::REST).to receive(:new).and_return(@http_client)
+      expect(@http_client).to receive(:get).with("clients/black").and_return(client)
+      @client = Chef::ApiClientV0.load(client['name'])
+    end
+
+    it "should deserialize to a Chef::ApiClientV0 object" do
+      expect(@client).to be_a_kind_of(Chef::ApiClientV0)
+    end
+
+    it "preserves the name" do
+      expect(@client.name).to eq("black")
+    end
+
+    it "preserves the public key" do
+      expect(@client.public_key).to eq("crowes")
+    end
+
+    it "preserves the admin status" do
+      expect(@client.admin).to be_a_kind_of(TrueClass)
+    end
+
+    it "preserves the 'validator' status" do
+      expect(@client.validator).to be_a_kind_of(TrueClass)
+    end
+
+    it "includes the private key if present" do
+      expect(@client.private_key).to eq("monkeypants")
+    end
+
+  end
+
+  describe "with correctly configured API credentials" do
+    before do
+      Chef::Config[:node_name] = "silent-bob"
+      Chef::Config[:client_key] = File.expand_path('ssl/private_key.pem', CHEF_SPEC_DATA)
+    end
+
+    after do
+      Chef::Config[:node_name] = nil
+      Chef::Config[:client_key] = nil
+    end
+
+    let :private_key_data do
+      File.open(Chef::Config[:client_key], "r") {|f| f.read.chomp }
+    end
+
+    it "has an HTTP client configured with default credentials" do
+      expect(@client.http_api).to be_a_kind_of(Chef::REST)
+      expect(@client.http_api.client_name).to eq("silent-bob")
+      expect(@client.http_api.signing_key.to_s).to eq(private_key_data)
+    end
+  end
+
+
+  describe "when requesting a new key" do
+    before do
+      @http_client = double("Chef::REST mock")
+      allow(Chef::REST).to receive(:new).and_return(@http_client)
+    end
+
+    context "and the client does not exist on the server" do
+      before do
+        @a_404_response = Net::HTTPNotFound.new("404 not found and such", nil, nil)
+        @a_404_exception = Net::HTTPServerException.new("404 not found exception", @a_404_response)
+
+        expect(@http_client).to receive(:get).with("clients/lost-my-key").and_raise(@a_404_exception)
+      end
+
+      it "raises a 404 error" do
+        expect { Chef::ApiClientV0.reregister("lost-my-key") }.to raise_error(Net::HTTPServerException)
+      end
+    end
+
+    context "and the client exists" do
+      before do
+        @api_client_without_key = Chef::ApiClientV0.new
+        @api_client_without_key.name("lost-my-key")
+        expect(@http_client).to receive(:get).with("clients/lost-my-key").and_return(@api_client_without_key)
+      end
+
+
+      context "and the client exists on a Chef 11-like server" do
+        before do
+          @api_client_with_key = Chef::ApiClientV0.new
+          @api_client_with_key.name("lost-my-key")
+          @api_client_with_key.private_key("the new private key")
+          expect(@http_client).to receive(:put).
+            with("clients/lost-my-key", :name => "lost-my-key", :admin => false, :validator => false, :private_key => true).
+            and_return(@api_client_with_key)
+        end
+
+        it "returns an ApiClient with a private key" do
+          response = Chef::ApiClientV0.reregister("lost-my-key")
+          # no sane == method for ApiClient :'(
+          expect(response).to eq(@api_client_without_key)
+          expect(response.private_key).to eq("the new private key")
+          expect(response.name).to eq("lost-my-key")
+          expect(response.admin).to be_falsey
+        end
+      end
+
+      context "and the client exists on a Chef 10-like server" do
+        before do
+          @api_client_with_key = {"name" => "lost-my-key", "private_key" => "the new private key"}
+          expect(@http_client).to receive(:put).
+            with("clients/lost-my-key", :name => "lost-my-key", :admin => false, :validator => false, :private_key => true).
+            and_return(@api_client_with_key)
+        end
+
+        it "returns an ApiClient with a private key" do
+          response = Chef::ApiClientV0.reregister("lost-my-key")
+          # no sane == method for ApiClient :'(
+          expect(response).to eq(@api_client_without_key)
+          expect(response.private_key).to eq("the new private key")
+          expect(response.name).to eq("lost-my-key")
+          expect(response.admin).to be_falsey
+          expect(response.validator).to be_falsey
+        end
+      end
+
+    end
+  end
+end