add an ApiExamples.scala to tests

src/test/scala/ApiExamples.scala

@@ -0,0 +1,45 @@
+import org.junit.Assert._
+import org.junit._
+import com.typesafe.config._
+import scala.collection.JavaConverters._
+import scala.collection.mutable
+
+/**
+ * This is to show how the API works and to be sure it's usable
+ * from outside of the library's package and in Scala.
+ * It isn't intended to be asserting anything or adding test coverage.
+ */
+class ApiExamples {
+    @Test
+    def readSomeConfig() {
+        val conf = Config.load("test01")
+
+        // you don't have to write the types explicitly of course,
+        // just doing that to show what they are.
+        val a: Int = conf.getInt("ints.fortyTwo")
+        val obj: ConfigObject = conf.getObject("ints")
+        val c: Int = obj.getInt("fortyTwo")
+
+        // this is unfortunate; asScala creates a mutable map but
+        // the ConfigObject is in fact immutable.
+        val objAsScalaMap: mutable.Map[String, ConfigValue] = obj.asScala
+
+        // this is sort of ugly...
+        val d: Int = conf.getAnyRef("ints.fortyTwo") match {
+            case x: java.lang.Integer => x
+            case x: java.lang.Long => x.intValue
+        }
+
+        class EnhancedConfigObject(obj: ConfigObject) {
+            def getAny(path: String): Any = obj.getAnyRef(path)
+        }
+        implicit def obj2enhanced(obj: ConfigObject) = new EnhancedConfigObject(obj)
+
+        // somewhat nicer
+        val e: Int = conf.getAny("ints.fortyTwo") match {
+            case x: Int => x
+            case x: Long => x.intValue
+        }
+        assertEquals(42, e)
+    }
+}