Small test refactor

Author: chrislo

spec/models/immunisation_import_spec.rb

@@ -86,15 +86,15 @@
   it_behaves_like "a CSVImportable model"
 
   describe ".create" do
-    it "a tagged message containing the started_at time of the import" do
+    it "logs a tagged message containing the started_at time of the import" do
       import = immunisation_import
 
       SemanticLogger.flush
       semantic_logger_io.rewind
 
-      log_lines = semantic_logger_io.read.split("\n")
-      tagged_lines = log_lines.map {|l| JSON.parse(l) }.select do |j|
-        j['named_tags'] == { 'import_class' => 'ImmunisationImport', 'import_id' => import.id }
+      log_lines = semantic_logger_io.readlines.map { |line| JSON.parse(line) }
+      tagged_lines = log_lines.select do |line|
+        line['named_tags'] == { 'import_class' => 'ImmunisationImport', 'import_id' => import.id }
       end
 
       expect(tagged_lines.size).to eq(1)