Add automated test

Follow `golang.org/x/tools/go/analysis/passes/testinggoroutine` to write
the test runner:

https://github.com/golang/tools/blob/1c9fe3f82c363b929ef7239ca0ad8a5dafbbcf05/go/analysis/passes/testinggoroutine/testinggoroutine_test.go

Add "want" comments to test code for validation.

2 files changed, 4 insertions, 4 deletions

diff --git a/testdata/simple.go b/testdata/simple.go
index 76fb5d5..8002953 100644
--- a/testdata/simple.go
+++ b/testdata/simple.go
@@ -8,8 +8,8 @@ func main() {
 	copied := 0
 
 	go func(copied int) {
-		capturedReference += 1
-		capturedReference2 += 1
+		capturedReference += 1 // want "captured reference capturedReference in goroutine closure"
+		capturedReference2 += 1 // want "captured reference capturedReference2 in goroutine closure"
 		copied += 1
 
 		if capturedReference == 1 {
@@ -36,6 +36,6 @@ func argumentReference() {
 	s := aStruct{field: 0}
 
 	go func(s *aStruct) {
-		s.field += 1
+		s.field += 1 // want "reference s in goroutine closure"
 	}(&s)
 }
diff --git a/testdata/struct_reference.go b/testdata/struct_reference.go
index 5ebc31d..98d627f 100644
--- a/testdata/struct_reference.go
+++ b/testdata/struct_reference.go
@@ -10,6 +10,6 @@ func (s *AStruct) setField(value string) {
 
 func (s *AStruct) method2() {
 	go func() {
-		s.setField("test")
+		s.setField("test") // want "captured reference s in goroutine closure"
 	}()
 }