Shorten the line and use methods, feedback:

spec/models/project_services/slack_service/build_message_spec.rb

@@ -20,14 +20,15 @@ describe SlackService::BuildMessage do
     }
   end
 
+  let(:message) { build_message }
+
   context 'succeeded' do
     let(:status) { 'success' }
     let(:color) { 'good' }
     let(:duration) { 10 }
+    let(:message) { build_message('passed') }
 
     it 'returns a message with information about succeeded build' do
-      message = '<example.gitlab.com|project_name>: Commit <example.gitlab.com/commit/97de212e80737a608d939f648d959671fb0a0142/builds|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker passed in 10 seconds'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
@@ -40,8 +41,6 @@ describe SlackService::BuildMessage do
     let(:duration) { 10 }
 
     it 'returns a message with information about failed build' do
-      message = '<example.gitlab.com|project_name>: Commit <example.gitlab.com/commit/97de212e80737a608d939f648d959671fb0a0142/builds|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker failed in 10 seconds'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
@@ -54,11 +53,17 @@ describe SlackService::BuildMessage do
     let(:duration) { 1 }
 
     it 'returns seconds as singular when there is only one' do
-      message = '<example.gitlab.com|project_name>: Commit <example.gitlab.com/commit/97de212e80737a608d939f648d959671fb0a0142/builds|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker failed in 1 second'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
     end
   end
+
+  def build_message(status_text=status)
+    "<example.gitlab.com|project_name>:" \
+    " Commit <example.gitlab.com/commit/" \
+    "97de212e80737a608d939f648d959671fb0a0142/builds|97de212e>" \
+    " of <example.gitlab.com/commits/develop|develop> branch" \
+    " by hacker #{status_text} in #{duration} #{'second'.pluralize(duration)}"
+  end
 end

spec/models/project_services/slack_service/pipeline_message_spec.rb

@@ -19,14 +19,15 @@ describe SlackService::PipelineMessage do
     }
   end
 
+  let(:message) { build_message }
+
   context 'succeeded' do
     let(:status) { 'success' }
     let(:color) { 'good' }
     let(:duration) { 10 }
+    let(:message) { build_message('passed') }
 
     it 'returns a message with information about succeeded build' do
-      message = '<example.gitlab.com|project_name>: Pipeline <example.gitlab.com/pipelines/123|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker passed in 10 seconds'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
@@ -39,8 +40,6 @@ describe SlackService::PipelineMessage do
     let(:duration) { 10 }
 
     it 'returns a message with information about failed build' do
-      message = '<example.gitlab.com|project_name>: Pipeline <example.gitlab.com/pipelines/123|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker failed in 10 seconds'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
@@ -53,11 +52,16 @@ describe SlackService::PipelineMessage do
     let(:duration) { 1 }
 
     it 'returns seconds as singular when there is only one' do
-      message = '<example.gitlab.com|project_name>: Pipeline <example.gitlab.com/pipelines/123|97de212e> of <example.gitlab.com/commits/develop|develop> branch by hacker failed in 1 second'
-
       expect(subject.pretext).to be_empty
       expect(subject.fallback).to eq(message)
       expect(subject.attachments).to eq([text: message, color: color])
     end
   end
+
+  def build_message(status_text=status)
+    "<example.gitlab.com|project_name>:" \
+    " Pipeline <example.gitlab.com/pipelines/123|97de212e>" \
+    " of <example.gitlab.com/commits/develop|develop> branch" \
+    " by hacker #{status_text} in #{duration} #{'second'.pluralize(duration)}"
+  end
 end