Fix flakey specs

lib/selective/ruby/core/file_correlator.rb

@@ -17,7 +17,10 @@ def initialize(diff, num_commits, target_branch)
         def correlate
           JSON.parse(get_correlated_files, symbolize_names: true)
         rescue FileCorrelatorError, JSON::ParserError
-          print_warning "Selective was unable to correlate the diff to test files. This may result in a sub-optimal test order. If the issue persists, please contact support."
+          print_warning(<<~MSG)
+            Selective was unable to correlate the diff to test files. This may result in a sub-optimal test order.
+            If the issue persists, please contact support.
+          MSG
         end
 
         private

spec/selective/ruby/core/controller_spec.rb

@@ -9,6 +9,7 @@
 
   before do
     allow(Process).to receive(:spawn).and_return(123)
+    allow(controller).to receive(:kill_transport)
     allow(controller).to receive(:handle_termination_signals)
     allow(controller).to receive(:wait_for_connectivity)
     allow(controller).to receive(:exit)

spec/selective/ruby/core/file_correlator_spec.rb

@@ -4,6 +4,11 @@
 
   describe "#correlate" do
     it "returns a hash with the expected shape" do
+      # The fetch normally happens when the diff is generated
+      # but if another runner created the manifest the fetch may
+      # not have happened on the runner that is running this test.
+      # So, we fetch here to ensure this test ddoes not fail.
+      `git fetch origin #{target_branch} --depth=1`
       expect(instance.correlate).to match({:correlated_files => Hash, :uncorrelated_files => Hash})
     end