cmd/vet: make vet_test module-agnostic

vet_test currently uses a custom GOPATH for each test, but it turns
out not to be necessary.

Updates #30228

Change-Id: Id7a7bf6d759bd94adccf44e197be1728c2f23575
Reviewed-on: https://go-review.googlesource.com/c/163038
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alan Donovan <adonovan@google.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/src/cmd/vet/testdata/httpresponse/httpresponse.go b/src/cmd/vet/testdata/httpresponse/httpresponse.go
new file mode 100644
index 0000000000..6141f6e06d
--- /dev/null
+++ b/src/cmd/vet/testdata/httpresponse/httpresponse.go
@@ -0,0 +1,22 @@
+package httpresponse
+
+import (
+	"log"
+	"net/http"
+)
+
+func goodHTTPGet() {
+	res, err := http.Get("http://foo.com")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer res.Body.Close()
+}
+
+func badHTTPGet() {
+	res, err := http.Get("http://foo.com")
+	defer res.Body.Close() // ERROR "using res before checking for errors"
+	if err != nil {
+		log.Fatal(err)
+	}
+}