Fix class methods on BizDev module

and add missing tests

spec/lib/biz_dev_spec.rb

@@ -0,0 +1,40 @@
+require 'spec_helper'
+
+describe BizDev, lib: true do
+  let(:first_biz_dev_id) { BizDev::BIZ_DEV_IDS.first }
+  let(:non_biz_dev_id) { first_biz_dev_id - 1 }
+
+  it { expect(BizDev::BIZ_DEV_MAPPING).not_to include(non_biz_dev_id) }
+
+  describe '#full_name' do
+    subject { described_class.full_name(administration_id) }
+
+    context 'when administration is a business developer' do
+      let(:administration_id) { first_biz_dev_id }
+
+      it { is_expected.not_to be_empty }
+    end
+
+    context 'when administration is not a business developer' do
+      let(:administration_id) { non_biz_dev_id }
+
+      it { is_expected.not_to be_empty }
+    end
+  end
+
+  describe '#pipedrive_id' do
+    subject { described_class.pipedrive_id(administration_id) }
+
+    context 'when administration is a business developer' do
+      let(:administration_id) { first_biz_dev_id }
+
+      it { is_expected.to be > 0 }
+    end
+
+    context 'when administration is not a business developer' do
+      let(:administration_id) { non_biz_dev_id }
+
+      it { is_expected.to be > 0 }
+    end
+  end
+end