#57 adding some tests

src/test/resources/bad-example-missing-fields.cfg

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+hosts = ["one", "two"]

src/test/resources/bad-example-missing-values.cfg

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+mode =
+hosts = ["one", "two"]

src/test/resources/bad-example.cfg

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+I'm nonsense

src/test/resources/example-empty.cfg

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+mode = "client"

src/test/resources/example.cfg

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+# comments are ok in my book
+mode = "server"
+hosts = ["one", "two"]

src/test/scala/bad/robot/temperature/config/ConfigFileTest.scala

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+package bad.robot.temperature.config
+
+import java.io.File
+
+import bad.robot.temperature.ConfigurationError
+import bad.robot.temperature.config.ConfigFile.loadOrWarn
+import knobs._
+import org.specs2.mutable.Specification
+
+class ConfigFileTest extends Specification {
+
+  "Can be loaded" >> {
+    loadOrWarn(Required(ClassPathResource("example.cfg"))).unsafeRunSync() must beRight
+  }
+
+  "Retrieve empty list for hosts" >> {
+    loadOrWarn(Required(ClassPathResource("example-empty.cfg"))).unsafeRunSync() must beRight.like { case config => {
+      config.mode must_== "client"
+      config.hosts must throwA[KeyError]
+    }}
+  }
+
+  "Retrieve no mode" >> {
+    val config = loadOrWarn(Required(ClassPathResource("bad-example-missing-fields.cfg"))).unsafeRunSync()
+    config must beRight.like { case config => {
+      config.mode must throwA[KeyError]
+      config.hosts must_== List("one", "two")
+    }}
+  }
+
+  "Retrieve the values configuration items" >> {
+    loadOrWarn(Required(ClassPathResource("example.cfg"))).unsafeRunSync() must beRight.like { case config => {
+      config.mode must_== "server"
+      config.hosts must_== List("one", "two")
+    }}
+  }
+
+  "Example failure messages" >> {
+    import scala.concurrent.ExecutionContext.Implicits.global     // todo replace with explicit one
+
+    loadOrWarn(Required(FileResource.unwatched(new File("/foo.cfg")))).unsafeRunSync() must beLeft.like {
+      case error: ConfigurationError => error.details must contain("/foo.cfg (No such file or directory)")
+    }
+    loadOrWarn(Required(FileResource.unwatched(new File(sys.props("user.home"))))).unsafeRunSync() must beLeft.like {
+      case error: ConfigurationError => error.details must contain(s"${sys.props("user.home")} (Is a directory)")
+    }
+    loadOrWarn(Required(ClassPathResource("not/present/temperature-machine.cfg"))).unsafeRunSync() must beLeft.like {
+      case error: ConfigurationError => error.details must contain("not/present/temperature-machine.cfg not found on classpath")
+    }
+    loadOrWarn(Required(ClassPathResource("bad-example.cfg"))).unsafeRunSync() must beLeft.like {
+      case error: ConfigurationError => error.details must contain("expected configuration")
+    }
+    loadOrWarn(Required(ClassPathResource("bad-example-missing-values.cfg"))).unsafeRunSync() must beLeft.like {
+      case error: ConfigurationError => error.details must contain("expected comment, newline, value, or whitespace")
+    }
+  }
+
+}