Wrote interface test case

parser/face_test.go

@@ -0,0 +1,25 @@
+package parser
+
+import "testing"
+
+func TestFace (test *testing.T) {
+	checkTree ("../tests/parser/face", false,
+`:arf
+---
+face ro ReadWriter:Face
+	write
+		> data:{Byte ..}
+		< wrote:Int
+		< err:Error
+	read
+		> into:{Byte ..}
+		< read:Int
+		< err:Error
+face ro Destroyer:Face
+	destroy
+face ro cFuncInterface
+	> something:Int
+	< someOutput:Int
+	< otherOutput:String
+`, test)
+}

tests/parser/face/main.arf

@@ -1,7 +1,7 @@
 :arf
 ---
 
-face ro ReadWriter:Face
+face ro aReadWriter:Face
 	write
 		> data:{Byte ..}
 		< wrote:Int
@@ -11,7 +11,10 @@ face ro ReadWriter:Face
 		< read:Int
 		< err:Error
 
-face ro Destroyer:Face
+face ro bDestroyer:Face
 	destroy
 
-# TODO: add test case for func interface
+face ro cFuncInterface
+	> something:Int
+	< someOutput:Int
+	< otherOutput:String