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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package expect_test
import (
"bytes"
"go/token"
"io/ioutil"
"testing"
"golang.org/x/tools/go/expect"
)
func TestMarker(t *testing.T) {
for _, tt := range []struct {
filename string
expectNotes int
expectMarkers map[string]string
expectChecks map[string][]interface{}
}{
{
filename: "testdata/test.go",
expectNotes: 13,
expectMarkers: map[string]string{
"αSimpleMarker": "α",
"OffsetMarker": "β",
"RegexMarker": "γ",
"εMultiple": "ε",
"ζMarkers": "ζ",
"ηBlockMarker": "η",
"Declared": "η",
"Comment": "ι",
"LineComment": "someFunc",
"NonIdentifier": "+",
"StringMarker": "\"hello\"",
},
expectChecks: map[string][]interface{}{
"αSimpleMarker": nil,
"StringAndInt": {"Number %d", int64(12)},
"Bool": {true},
},
},
{
filename: "testdata/go.fake.mod",
expectNotes: 2,
expectMarkers: map[string]string{
"αMarker": "αfake1α",
"βMarker": "require golang.org/modfile v0.0.0",
},
},
} {
t.Run(tt.filename, func(t *testing.T) {
content, err := ioutil.ReadFile(tt.filename)
if err != nil {
t.Fatal(err)
}
readFile := func(string) ([]byte, error) { return content, nil }
markers := make(map[string]token.Pos)
for name, tok := range tt.expectMarkers {
offset := bytes.Index(content, []byte(tok))
markers[name] = token.Pos(offset + 1)
end := bytes.Index(content[offset:], []byte(tok))
if end > 0 {
markers[name+"@"] = token.Pos(offset + end + 2)
}
}
fset := token.NewFileSet()
notes, err := expect.Parse(fset, tt.filename, content)
if err != nil {
t.Fatalf("Failed to extract notes: %v", err)
}
if len(notes) != tt.expectNotes {
t.Errorf("Expected %v notes, got %v", tt.expectNotes, len(notes))
}
for _, n := range notes {
switch {
case n.Args == nil:
// A //@foo note associates the name foo with the position of the
// first match of "foo" on the current line.
checkMarker(t, fset, readFile, markers, n.Pos, n.Name, n.Name)
case n.Name == "mark":
// A //@mark(name, "pattern") note associates the specified name
// with the position on the first match of pattern on the current line.
if len(n.Args) != 2 {
t.Errorf("%v: expected 2 args to mark, got %v", fset.Position(n.Pos), len(n.Args))
continue
}
ident, ok := n.Args[0].(expect.Identifier)
if !ok {
t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
continue
}
checkMarker(t, fset, readFile, markers, n.Pos, string(ident), n.Args[1])
case n.Name == "check":
// A //@check(args, ...) note specifies some hypothetical action to
// be taken by the test driver and its expected outcome.
// In this test, the action is to compare the arguments
// against expectChecks.
if len(n.Args) < 1 {
t.Errorf("%v: expected 1 args to check, got %v", fset.Position(n.Pos), len(n.Args))
continue
}
ident, ok := n.Args[0].(expect.Identifier)
if !ok {
t.Errorf("%v: identifier, got %T", fset.Position(n.Pos), n.Args[0])
continue
}
args, ok := tt.expectChecks[string(ident)]
if !ok {
t.Errorf("%v: unexpected check %v", fset.Position(n.Pos), ident)
continue
}
if len(n.Args) != len(args)+1 {
t.Errorf("%v: expected %v args to check, got %v", fset.Position(n.Pos), len(args)+1, len(n.Args))
continue
}
for i, got := range n.Args[1:] {
if args[i] != got {
t.Errorf("%v: arg %d expected %v, got %v", fset.Position(n.Pos), i, args[i], got)
}
}
default:
t.Errorf("Unexpected note %v at %v", n.Name, fset.Position(n.Pos))
}
}
})
}
}
func checkMarker(t *testing.T, fset *token.FileSet, readFile expect.ReadFile, markers map[string]token.Pos, pos token.Pos, name string, pattern interface{}) {
start, end, err := expect.MatchBefore(fset, readFile, pos, pattern)
if err != nil {
t.Errorf("%v: MatchBefore failed: %v", fset.Position(pos), err)
return
}
if start == token.NoPos {
t.Errorf("%v: Pattern %v did not match", fset.Position(pos), pattern)
return
}
expectStart, ok := markers[name]
if !ok {
t.Errorf("%v: unexpected marker %v", fset.Position(pos), name)
return
}
if start != expectStart {
t.Errorf("%v: Expected %v got %v", fset.Position(pos), fset.Position(expectStart), fset.Position(start))
}
if expectEnd, ok := markers[name+"@"]; ok && end != expectEnd {
t.Errorf("%v: Expected end %v got %v", fset.Position(pos), fset.Position(expectEnd), fset.Position(end))
}
}
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