Fix build

.travis.yml

@@ -1,12 +1,13 @@
+sudo: false
 language: ruby
 before_script:
   - mysql -e 'create database rla_test;'
   - psql -c 'create database rla_test;' -U postgres
 script: bundle exec rake
 rvm:
-  - 1.9.3
-  - 2.0.0
-  - 2.1.1
+  - "2.0"
+  - "2.1"
+  - "2.2"
   - ruby-head
   - jruby-19mode
   - jruby-head

lib/request_log_analyzer/tracker/timespan.rb

@@ -45,6 +45,7 @@ def last_timestamp
 
     # Difference between last and first timestamp.
     def timespan
+      raise StandardError, "No requests tracked yet, cannot calculate timestamp" if @first == 99_999_999_999_999 && @last == 0
       last_timestamp - first_timestamp
     end
 

request-log-analyzer.gemspec

@@ -43,7 +43,7 @@ Gem::Specification.new do |gem|
     gem.add_development_dependency('activerecord-jdbcpostgresql-adapter')
   else
     gem.add_development_dependency('sqlite3')
-    gem.add_development_dependency('mysql2')
+    gem.add_development_dependency('mysql2', '~> 0.3.10')
     gem.add_development_dependency('pg')
   end
 

spec/unit/tracker/timespan_tracker_spec.rb

@@ -37,7 +37,7 @@
   end
 
   it 'should raise an error when no timestamp is set' do
-    lambda { @tracker.timespan }.should raise_error
+    lambda { @tracker.timespan }.should raise_error(StandardError)
   end
 end