diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61a32f1..de3f20a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## master
 
+- Allow to match failure reasons with RSpec DSL. ([@inkstak])
+
 ## 0.7.2 (2024-11-21)
 
 - Fix missing details in deny! message interpolation. ([@palkan][])
diff --git a/docs/testing.md b/docs/testing.md
index 413a824..904993e 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -104,6 +104,12 @@ describe PostPolicy do
         before { user.role = "manager" }
       end
     end
+
+    # `failed` allowed to validates feailures reasons when they are provided
+    # (see Failure Reasons)
+    failed "when post is archived", reason: {post: [{archived?: {since: "2 days"}}]}
+      before { post.archived_at = 2.days.ago }
+    end
   end
 end
 ```
diff --git a/lib/action_policy/rspec/dsl.rb b/lib/action_policy/rspec/dsl.rb
index 9d34cdb..e8962a3 100644
--- a/lib/action_policy/rspec/dsl.rb
+++ b/lib/action_policy/rspec/dsl.rb
@@ -87,8 +87,8 @@ def formatted_policy(policy)
         end
 
         case reason
-        when nil    then next
-        when Hash   then next if subject.reasons.details == reason
+        when nil then next
+        when Hash then next if subject.reasons.details == reason
         when Symbol then next if subject.reasons.details.values.flatten.include?(reason)
         when String then next if subject.reasons.full_messages.flatten.include?(reason)
         else
@@ -97,7 +97,7 @@ def formatted_policy(policy)
 
         raise(
           RSpec::Expectations::ExpectationNotMetError,
-          "Expected to fail with #{reason.inspect} but but actually failed for another reason:\n#{subject.inspect}",
+          "Expected to fail with #{reason.inspect} but but actually failed for another reason:\n#{formatted_policy(policy)}}",
           the_caller
         )
       end
diff --git a/spec/action_policy/dsl_spec.rb b/spec/action_policy/dsl_spec.rb
index 4378718..c414eea 100644
--- a/spec/action_policy/dsl_spec.rb
+++ b/spec/action_policy/dsl_spec.rb
@@ -28,6 +28,15 @@ def show?
   def manage?
     user.admin? && !record.admin?
   end
+
+  def delete?
+    user.admin? && check?(:not_admin?)
+  end
+
+  def not_admin?
+    details[:username] = record.name
+    !record.admin?
+  end
 end
 
 describe UserPolicy, type: :policy do
@@ -74,4 +83,40 @@ def manage?
       end
     end
   end
+
+  describe_rule :delete? do
+    let(:user) { admin }
+    let(:record) { User.new("admin") }
+
+    failed "and reason matches", reason: {user: [{not_admin?: {username: "admin"}}]}
+
+    context "test errors with reasons" do
+      after do |ex|
+        msg = ex.exception.message
+        # mark as not failed
+        ex.remove_instance_variable(:@exception)
+
+        puts
+        puts msg
+        puts
+
+        expect(msg).to include(<<~MESSAGE.strip)
+          Expected to fail with :unexpected but but actually failed for another reason:
+          <UserPolicy#delete?: false (reasons: {:user=>[{:not_admin?=>{:username=>"admin"}}]})
+        MESSAGE
+
+        if ActionPolicy::PrettyPrint.available?
+          expect(msg).to include(<<~MESSAGE.strip)
+            ↳ user.admin? #=> #{ActionPolicy::PrettyPrint.colorize(true)}
+              AND
+              check?(:not_admin?) #=> #{ActionPolicy::PrettyPrint.colorize(false)}
+          MESSAGE
+        end
+      end
+
+      failed reason: :unexpected do
+        let(:record) { User.new("admin") }
+      end
+    end
+  end
 end