test(iferr): add test

chore(ci): install go, and go bins for tests

spec/fixtures/iferr/iferr_input.go

@@ -0,0 +1,9 @@
+package main
+
+func test() error {
+	return nil
+}
+
+func main() {
+	err := test()
+}

spec/fixtures/iferr/iferr_output.go

@@ -0,0 +1,12 @@
+package main
+
+func test() error {
+	return nil
+}
+
+func main() {
+	err := test()
+	if err != nil {
+		return
+	}
+}