diff --git a/app/jobs/aws_check_fixity_job.rb b/app/jobs/aws_check_fixity_job.rb
index ea9d798..5b31887 100644
--- a/app/jobs/aws_check_fixity_job.rb
+++ b/app/jobs/aws_check_fixity_job.rb
@@ -1,28 +1,16 @@
 # frozen_string_literal: true
 
-# rubocop:disable Metrics/MethodLength
-
 class AwsCheckFixityJob < ApplicationJob
   queue_as CheckPlease::Queues::CHECK_FIXITY
 
   def perform(job_identifier, bucket_name, object_path, checksum_algorithm_name)
     response_stream_name = "#{FixityCheckChannel::FIXITY_CHECK_STREAM_PREFIX}#{job_identifier}"
-    progress_report_lambda = lambda { |_chunk, _bytes_read, chunk_counter|
-      return unless (chunk_counter % 100).zero?
-
-      # TODO: Broadcast a message to indicate that the processing is still happening.
-      # This way, clients will know if a job has stalled and will not wait indefinitely for results.
-      ActionCable.server.broadcast(
-        response_stream_name,
-        { type: 'fixity_check_in_progress' }.to_json
-      )
-    }
 
     checksum_hexdigest, object_size = CheckPlease::Aws::ObjectFixityChecker.check(
       bucket_name,
       object_path,
       checksum_algorithm_name,
-      on_chunk: progress_report_lambda
+      on_chunk: progress_report_lambda(response_stream_name)
     )
 
     # Broadcast message when job is complete
@@ -63,4 +51,17 @@ def broadcast_fixity_check_error(
       }.to_json
     )
   end
+
+  def progress_report_lambda(response_stream_name)
+    lambda do |_chunk, _bytes_read, chunk_counter|
+      return unless (chunk_counter % 100).zero?
+
+      # We periodically broadcast a message to indicate that the processing is still happening.
+      # This is so that a client can check whether a job has stalled.
+      ActionCable.server.broadcast(
+        response_stream_name,
+        { type: 'fixity_check_in_progress' }.to_json
+      )
+    end
+  end
 end
diff --git a/spec/aws_check_fixity_job_spec.rb b/spec/aws_check_fixity_job_spec.rb
new file mode 100644
index 0000000..621c0c9
--- /dev/null
+++ b/spec/aws_check_fixity_job_spec.rb
@@ -0,0 +1,101 @@
+# frozen_string_literal: true
+
+# rubocop:disable RSpec/ExampleLength
+
+require 'rails_helper'
+
+describe AwsCheckFixityJob do
+  let(:aws_check_fixity_job) { described_class.new }
+  let(:job_identifier) { 'great-job' }
+  let(:bucket_name) { 'example-bucket' }
+  let(:object_path) { 'path/to/object.png' }
+  let(:checksum_algorithm_name) { 'sha256' }
+  let(:example_content) { 'example' }
+  let(:checksum_hexdigest) { Digest::SHA256.hexdigest(example_content) }
+  let(:object_size) { example_content.bytesize }
+  let(:stream_name) { "#{FixityCheckChannel::FIXITY_CHECK_STREAM_PREFIX}#{job_identifier}" }
+  let(:error_message) { 'oh no!' }
+
+  describe '#perform' do
+    it 'works as expected' do
+      allow(CheckPlease::Aws::ObjectFixityChecker).to receive(:check).with(
+        bucket_name,
+        object_path,
+        checksum_algorithm_name,
+        on_chunk: Proc
+      ).and_return([checksum_hexdigest, object_size])
+      expect(aws_check_fixity_job).to receive(:broadcast_fixity_check_complete).with(
+        stream_name,
+        bucket_name,
+        object_path,
+        checksum_algorithm_name,
+        checksum_hexdigest,
+        object_size
+      )
+      aws_check_fixity_job.perform(job_identifier, bucket_name, object_path, checksum_algorithm_name)
+    end
+
+    it 'broadcasts a fixity check error message when an error occurs during processing' do
+      allow(CheckPlease::Aws::ObjectFixityChecker).to receive(:check).and_raise(StandardError, error_message)
+
+      expect(aws_check_fixity_job).to receive(:broadcast_fixity_check_error).with(
+        stream_name,
+        error_message,
+        bucket_name,
+        object_path,
+        checksum_algorithm_name
+      )
+      aws_check_fixity_job.perform(job_identifier, bucket_name, object_path, checksum_algorithm_name)
+    end
+  end
+
+  describe '#progress_report_lambda' do
+    let(:chunk) { 'a chunk of content' }
+    let(:bytes_read) { 12_345 }
+
+    it 'broadcasts an Action Cable message at the expected interval' do
+      progress_report_lambda = aws_check_fixity_job.progress_report_lambda(stream_name)
+      expect(ActionCable.server).to receive(:broadcast).exactly(10).times
+      (1..1000).each do |i|
+        progress_report_lambda.call(chunk, bytes_read, i)
+      end
+    end
+  end
+
+  describe '#broadcast_fixity_check_complete' do
+    it 'results in the expected broadcast' do
+      expect(ActionCable.server).to receive(:broadcast).with(
+        stream_name,
+        {
+          type: 'fixity_check_complete',
+          data: {
+            bucket_name: bucket_name, object_path: object_path,
+            checksum_algorithm_name: checksum_algorithm_name,
+            checksum_hexdigest: checksum_hexdigest, object_size: object_size
+          }
+        }.to_json
+      )
+      aws_check_fixity_job.broadcast_fixity_check_complete(
+        stream_name, bucket_name, object_path, checksum_algorithm_name, checksum_hexdigest, object_size
+      )
+    end
+  end
+
+  describe '#broadcast_fixity_check_error' do
+    it 'results in the expected broadcast' do
+      expect(ActionCable.server).to receive(:broadcast).with(
+        stream_name,
+        {
+          type: 'fixity_check_error',
+          data: {
+            error_message: error_message, bucket_name: bucket_name,
+            object_path: object_path, checksum_algorithm_name: checksum_algorithm_name
+          }
+        }.to_json
+      )
+      aws_check_fixity_job.broadcast_fixity_check_error(
+        stream_name, error_message, bucket_name, object_path, checksum_algorithm_name
+      )
+    end
+  end
+end
diff --git a/spec/channels/fixity_check_channel_spec.rb b/spec/channels/fixity_check_channel_spec.rb
index c4c4eef..fcd4619 100644
--- a/spec/channels/fixity_check_channel_spec.rb
+++ b/spec/channels/fixity_check_channel_spec.rb
@@ -47,7 +47,8 @@
         ).and_return([checksum_hexdigest, object_size])
       end
 
-      it 'initiates a checksum calculation, which queues a background job' do
+      it  'initiates a checksum calculation, which queues a background job and '\
+          'responds with a fixity_check_complete broadcast' do
         expect(AwsCheckFixityJob).to receive(:perform_later).with(
           job_identifier, bucket_name, object_path, checksum_algorithm_name
         ).and_call_original