Easily audit the difference between two dart objects in a failed test

audit_dart_test.sh

#!/usr/bin/env sh


# # These functions make it easy to look at the output of a dart
# # test with large non-matching objects. 
# 
# # To use: 
# # One and done: 
# auditDartTest test/example_test.dart 'this test fails'
# 
# # Or, if you want to check intermediate outputs: 
# # Create the reference json file
# runAndSaveDartTest test/example_test.dart 'this test fails'
# auditDartTestFailure temp_file.json
# ... output ...
# rm temp_file.json

runAndSaveDartTest(){
  flutter test -r json $1 --name $2 > temp_file.json 
}

auditDartTest(){
  flutter test -r json $1 --name $2 > temp_file.json
  auditDartTestFailure temp_file.json
  rm temp_file.json 
}

auditDartTestFailure(){
  cat $1 | extractErrorMessage > temp_error_msg
  extractObjects temp_error_msg  > temp_objects
  echo $( diffExpectedActual temp_objects )
  rm temp_error_msg
  rm temp_objects
}

extractErrorMessage(){
   cat $1 | jq -s 'map(select(.message != null)) | .[] | {message} | join("")' | grep "EXCEPTION" | sed 's/.*Expected/Expected/' | sed 's/\\n\\nWhen.*//'
}

extractObjects(){
  input=$(cat $1)
  actual=$( echo -n  $input |  tr -d '\n' | sed 's/.*Actual/Actual/' | awk '{$1=$1};1' )
  expected=$( echo -n $input | tr -d '\n' | sed 's/Actual.*//' |  awk '{$1=$1};1' )
  echo "$expected\n$actual\n"
}

diffExpectedActual(){
  input=$(cat $1)
  actual=$( echo "$input" | tail -n 1 )
  expected=$( echo "$input" |  head -n 1 )
  git --no-pager  diff --color=always $(echo "$expected" | git hash-object -w --stdin) $(echo "$actual" | git hash-object -w --stdin) --word-diff | tail -n +6
}