From ac7084682dfb15a4d43f6caa0598029a8cafa456 Mon Sep 17 00:00:00 2001
From: Beth Skurrie <beth@bethesque.com>
Date: Mon, 6 Apr 2020 17:26:04 +1000
Subject: [PATCH] fix: do not blow up when there are no matchers

---
 lib/pact/matching_rules/v3/merge.rb           |  6 ++++--
 spec/lib/pact/matching_rules/v3/merge_spec.rb | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/lib/pact/matching_rules/v3/merge.rb b/lib/pact/matching_rules/v3/merge.rb
index a8acafd..2a276b1 100644
--- a/lib/pact/matching_rules/v3/merge.rb
+++ b/lib/pact/matching_rules/v3/merge.rb
@@ -108,8 +108,10 @@ def handle_regex object, path, rules
         def log_ignored_rules
           @matching_rules.each do | jsonpath, rules_hash |
             rules_array = rules_hash["matchers"]
-            ((rules_array.length - 1)..0).each do | index |
-              rules_array.delete_at(index) if rules_array[index].empty?
+            if rules_array
+              ((rules_array.length - 1)..0).each do | index |
+                rules_array.delete_at(index) if rules_array[index].empty?
+              end
             end
           end
 
diff --git a/spec/lib/pact/matching_rules/v3/merge_spec.rb b/spec/lib/pact/matching_rules/v3/merge_spec.rb
index 7d69209..05d5dec 100644
--- a/spec/lib/pact/matching_rules/v3/merge_spec.rb
+++ b/spec/lib/pact/matching_rules/v3/merge_spec.rb
@@ -513,5 +513,23 @@
         expect(subject).to eq Pact::SomethingLike.new("/some/path")
       end
     end
+
+    context "when there are no matchers" do
+      let(:expected) do
+        {
+          "name" => "Mary"
+        }
+      end
+
+      let(:matching_rules) do
+        {
+          "$.name" => {}
+        }
+      end
+
+      it "does not blow up" do
+        subject
+      end
+    end
   end
 end