Added failing spec for nested rescue_from declarations

Author: wowinter13

Diff for: CHANGELOG.md

@@ -10,6 +10,7 @@
 * [#1976](https://github.com/ruby-grape/grape/pull/1976): Ensure classes/modules listed for autoload really exist - [@dnesteryuk](https://github.com/dnesteryuk).
 * [#1971](https://github.com/ruby-grape/grape/pull/1971): Fix BigDecimal coercion - [@FlickStuart](https://github.com/FlickStuart).
 * [#1968](https://github.com/ruby-grape/grape/pull/1968): Fix args forwarding in Grape::Middleware::Stack#merge_with for ruby 2.7.0 - [@dm1try](https://github.com/dm1try).
+* [#1982](https://github.com/ruby-grape/grape/pull/1982): Added failing spec for nested rescue_from declarations - [@wowinter13](https://github.com/wowinter13).
 
 ### 1.3.0 (2020/01/11)
 

Diff for: spec/grape/api/nested_rescue_from_spec.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# see https://github.com/ruby-grape/grape/issues/1975
+
+require 'spec_helper'
+
+module NestedRescueFromSpec
+  class Alpacas < Grape::API
+    resource :alpacas do
+      rescue_from :all do
+        error_response(status: 200)
+      end
+
+      get do
+        { count_alpacas: 1 / 0 }
+      end
+    end
+  end
+
+  class Main < Grape::API
+    rescue_from ZeroDivisionError do
+      error_response(status: 500)
+    end
+
+    mount NestedRescueFromSpec::Alpacas
+  end
+end
+
+describe Grape::API do
+  subject { NestedRescueFromSpec::Main }
+
+  def app
+    subject
+  end
+
+  it 'calls the inner rescue_from :all from Alpacas class' do
+    get '/alpacas'
+    expect(last_response.status).to eql 200
+  end
+end