Fix income endpoint if the API returns no result (#61)

CHANGELOG.md

@@ -1,6 +1,7 @@
 ### 1.1.1 (Next)
 
 * Your contribution here.
+* [#61](https://github.com/dblock/iex-ruby-client/pull/61): Fix income endpoint if the api returns no result - [@brunjo](https://github.com/brunjo).
 * [#57](https://github.com/dblock/iex-ruby-client/pull/57): Update properties for chart api endpoint - [@brunjo](https://github.com/brunjo).
 
 ### 1.1.0 (2019/07/08)

lib/iex/endpoints/income.rb

@@ -2,7 +2,7 @@ module IEX
   module Endpoints
     module Income
       def income(symbol, options = {})
-        get("stock/#{symbol}/income", options)['income'].map do |data|
+        (get("stock/#{symbol}/income", options)['income'] || []).map do |data|
           IEX::Resources::Income.new(data)
         end
       rescue Faraday::ResourceNotFound => e

spec/iex/endpoints/income_spec.rb

@@ -48,9 +48,18 @@
     end
   end
 
+  context 'no result', vcr: { cassette_name: 'income/nsrgy' } do
+    subject do
+      client.income('nsrgy')
+    end
+    it 'returns empty array' do
+      expect(subject).to eq []
+    end
+  end
+
   context 'invalid symbol', vcr: { cassette_name: 'income/invalid' } do
     subject do
-      client.earnings('INVALID')
+      client.income('INVALID')
     end
     it 'fails with SymbolNotFoundError' do
       expect { subject }.to raise_error IEX::Errors::SymbolNotFoundError, 'Symbol INVALID Not Found'