add tests.

Author: ldez

passes/bodyclose/testdata/src/a/issue4.go

@@ -0,0 +1,20 @@
+package a
+
+import (
+	"io"
+	"net/http"
+)
+
+func issue4_1() {
+	resp, _ := http.Get("https://example.com") // want "response body must be closed"
+
+	foo(resp.Body)
+}
+
+func foo(r io.ReadCloser) {}
+
+func issue4_2() {
+	resp, _ := http.Get("https://example.com") // want "response body must be closed"
+
+	_ = http.MaxBytesReader(nil, resp.Body, 1024)
+}