fix object POST in flag test

spec/requests/reports_spec.rb

@@ -1,27 +1,23 @@
 RSpec.describe "Reports" do
   let(:user) { create :user }
-  let(:report_body) {
-    <<-EOF
-      {
-        "@context":"https://www.w3.org/ns/activitystreams",
-        "id":"https://mastodon.me.uk/d977f377-214b-4efd-8a47-70a37fb7ea20",
-        "type":"Flag",
-        "actor":"https://mastodon.me.uk/actor",
-        "content":"Test, please ignore",
-        "object":[
-          "https://example.com/models/abc123"
-        ]
-      }
-    EOF
-  }
+  let(:report_body) { {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    "id": "https://mastodon.me.uk/d977f377-214b-4efd-8a47-70a37fb7ea20",
+    "type": "Flag",
+    "actor": "https://mastodon.me.uk/actor",
+    "content": "Test, please ignore",
+    "object": [
+      "https://example.com/models/abc123"
+    ]
+  } }
 
   it "should accept Flag activities" do
-    post user.actor.inbox_url, params: report_body, headers: { content_type: "application/activity" }
-    expect(response.status).to be :created
+    post user.actor.inbox_url, params: report_body, as: :json
+    expect(response.status).to eq 201
   end
 
   it "should call registered Report handler when a flag is received by Federails" do
     expect(Federails::Moderation::Report).to receive(:handle_flag).once.and_call_original
-    post user.actor.inbox_url, params: report_body, headers: { content_type: "application/activity" }
+    post user.actor.inbox_url, params: report_body, as: :json
   end
 end