Better state management in spec and add some tests for MangaDex::Queue

spec/spec_helper.cr

@@ -1,3 +1,65 @@
 require "spec"
 require "../src/context"
 require "../src/server"
+
+class State
+	@@hash = {} of String => String
+
+	def self.get(key)
+		@@hash[key]?
+	end
+
+	def self.get!(key)
+		@@hash[key]
+	end
+
+	def self.set(key, value)
+		return if value.nil?
+		@@hash[key] = value
+	end
+
+	def self.reset
+		@@hash.clear
+	end
+end
+
+def get_tempfile(name)
+	path = State.get name
+	if path.nil? || !File.exists? path
+		file = File.tempfile name
+		State.set name, file.path
+		return file
+	else
+		return File.new path
+	end
+end
+
+def with_default_config
+	temp_config = get_tempfile "mango-test-config"
+	config = Config.load temp_config.path
+	logger = MLogger.new config
+	yield config, logger, temp_config.path
+	temp_config.delete
+end
+
+def with_storage
+	with_default_config do |config, logger|
+		temp_db = get_tempfile "mango-test-db"
+		storage = Storage.new temp_db.path, logger
+		clear = yield storage, temp_db.path
+		if clear == true
+			temp_db.delete
+		end
+	end
+end
+
+def with_queue
+	with_default_config do |config, logger|
+		temp_queue_db = get_tempfile "mango-test-queue-db"
+		queue = MangaDex::Queue.new temp_queue_db.path, logger
+		clear = yield queue, temp_queue_db.path
+		if clear == true
+			temp_queue_db.delete
+		end
+	end
+end