Use configuration on determine test path

Fix https://bugs.swift.org/browse/SR-1159

Author: norio-nomura

Sources/swift-test/main.swift

@@ -21,14 +21,15 @@ do {
         usage()
     case .Run(let xctestArg):
         let dir = try directories()
+        let configuration = "debug" //FIXME should swift-test support configuration option?
 
         func determineTestPath() -> String {
 
             //FIXME better, ideally without parsing manifest since
             // that makes us depend on the whole Manifest system
 
             let packageName = dir.root.basename  //FIXME probably not true
-            let maybePath = Path.join(dir.build, "\(packageName).xctest")
+            let maybePath = Path.join(dir.build, configuration, "\(packageName).xctest")
 
             if maybePath.exists {
                 return maybePath
@@ -40,7 +41,7 @@ do {
             }
         }
 
-        let yamlPath = Path.join(dir.build, "debug.yaml")
+        let yamlPath = Path.join(dir.build, "\(configuration).yaml")
         try build(YAMLPath: yamlPath, target: "test")
 
         let success = try test(path: determineTestPath(), xctestArg: xctestArg)