add example test

Author: mauri870

src/cmd/go/testdata/script/test_skip.txt

@@ -13,13 +13,19 @@ stdout RUN.*Test2/3
 go test -v -skip 2/3 skip_test.go
 stdout RUN.*Test1
 stdout RUN.*Test2
+stdout RUN.*ExampleTest1
 ! stdout Test2/3
 
 go test -v -skip 2/4 skip_test.go
 stdout RUN.*Test1
 stdout RUN.*Test2
 stdout RUN.*Test2/3
+stdout RUN.*ExampleTest1
 
+go test -v -skip Example skip_test.go
+stdout RUN.*Test1
+stdout RUN.*Test2
+stdout RUN.*Test2/3
 
 -- skip_test.go --
 package skip_test
@@ -32,3 +38,7 @@ func Test1(t *testing.T) {
 func Test2(t *testing.T) {
 	t.Run("3", func(t *testing.T) {})
 }
+
+func ExampleTest1() {
+	// Output:
+}