Add first version of JuliaAdapter

The adapter was tested with a first demo exercise, but further adjustments might be necessary to cover all edge cases.

lib/julia_adapter.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+class JuliaAdapter < TestingFrameworkAdapter
+  COUNT_REGEXP = /(?<testset>[^|\s]*)\s+\|\s+(?<pass>\d+)\s+(?>(?<fail>\d+)\s+)?(?<total>\d+)\s+(?<seconds>\d+\.\d+)s/
+  ASSERTION_ERROR_REGEXP = /(?<testset>[^:]*): (?<what>.*?) at (?<filename>[^:]*):(?<line>\d+)\s*(?<message>.*?)\s*Stacktrace:/m
+  LOAD_ERROR_REGEXP = /ERROR: LoadError: (?<message>.*?)\s*Stacktrace:/m
+  def self.framework_name
+    'Julia Unit Testing'
+  end
+
+  def parse_output(output)
+    if output[:stdout].present?
+      parse_test_results(output[:stdout])
+    else
+      parse_error(output[:stderr])
+    end
+  end
+
+  def parse_test_results(output)
+    test_lines = output.to_enum(:scan, COUNT_REGEXP).map { Regexp.last_match } || [{}]
+    test_result = test_lines.last
+
+    passed = test_result[:pass].try(:to_i) || 0
+    count = test_result[:total].try(:to_i) || 0
+    failed = test_result[:fail].try(:to_i) || (count - passed) || 0
+    if failed.zero?
+      {count:, passed: count}
+    else
+      error_matches = output.to_enum(:scan, ASSERTION_ERROR_REGEXP).map { Regexp.last_match } || []
+      messages = error_matches.pluck(:message)
+      {count:, failed:, error_messages: messages.flatten.compact_blank}
+    end
+  end
+
+  def parse_error(output)
+    error_matches = output.to_enum(:scan, LOAD_ERROR_REGEXP).map { Regexp.last_match } || []
+    messages = error_matches.pluck(:message)
+    {count: 1, failed: 1, error_messages: messages.flatten.compact_blank}
+  end
+end