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package buildtags
import "testing"
func TestGoString(t *testing.T) {
cases := []struct {
Constraint Interface
Expect string
}{
{Term("amd64"), "// +build amd64\n"},
{Any(Opt(Term("linux"), Term("386")), Opt("darwin", Not("cgo"))), "// +build linux,386 darwin,!cgo\n"},
{And(Any(Term("linux"), Term("darwin")), Term("386")), "// +build linux darwin\n// +build 386\n"},
}
for _, c := range cases {
got := c.Constraint.ToConstraints().GoString()
if got != c.Expect {
t.Errorf("constraint %#v GoString() got %q; expected %q", c.Constraint, got, c.Expect)
}
}
}
func TestValidateOK(t *testing.T) {
cases := []Interface{
Term("name"),
Term("!name"),
}
for _, c := range cases {
if err := c.ToConstraints().Validate(); err != nil {
t.Errorf("unexpected validation error for %#v: %q", c, err)
}
}
}
func TestValidateErrors(t *testing.T) {
cases := []struct {
Constraint Interface
ExpectMessage string
}{
{Term(""), "empty tag name"},
{Term("!"), "empty tag name"},
{Term("!!"), "at most one '!' allowed"},
{Term("!abc!def"), "character '!' disallowed in tags"},
{
And(Any(Term("linux"), Term("my-os")), Term("386")).ToConstraints(),
"invalid term \"my-os\": character '-' disallowed in tags",
},
}
for _, c := range cases {
err := c.Constraint.Validate()
if err == nil {
t.Fatalf("expect validation error for constraint:\n%s", c.Constraint.GoString())
}
if err.Error() != c.ExpectMessage {
t.Fatalf("unexpected error message\n\tgot:\t%q\n\texpect:\t%q\n", err, c.ExpectMessage)
}
}
}
func TestParseConstraintRoundTrip(t *testing.T) {
exprs := []string{
"amd64",
"amd64,linux",
"!a",
"!a,b c,!d,e",
"linux,386 darwin,!cgo",
}
for _, expr := range exprs {
c := AssertParseConstraint(t, expr)
got := c.GoString()
expect := "// +build " + expr + "\n"
if got != expect {
t.Fatalf("roundtrip error\n\tgot\t%q\n\texpect\t%q\n", got, expect)
}
}
}
func TestParseConstraintError(t *testing.T) {
expr := "linux,386 my-os,!cgo"
_, err := ParseConstraint(expr)
if err == nil {
t.Fatalf("expected error parsing %q", expr)
}
}
func TestEvaluate(t *testing.T) {
cases := []struct {
Constraint Interface
Values map[string]bool
Expect bool
}{
{Term("a"), SetTags("a"), true},
{Term("!a"), SetTags("a"), false},
{Term("!a"), SetTags(), true},
{Term("inval-id"), SetTags("inval-id"), false},
{Opt(Term("a"), Term("b")), SetTags(), false},
{Opt(Term("a"), Term("b")), SetTags("a"), false},
{Opt(Term("a"), Term("b")), SetTags("b"), false},
{Opt(Term("a"), Term("b")), SetTags("a", "b"), true},
{Opt(Term("a"), Term("b-a-d")), SetTags("a", "b-a-d"), false},
{
Any(Opt(Term("linux"), Term("386")), Opt("darwin", Not("cgo"))),
SetTags("linux", "386"),
true,
},
{
Any(Opt(Term("linux"), Term("386")), Opt("darwin", Not("cgo"))),
SetTags("darwin"),
true,
},
{
Any(Opt(Term("linux"), Term("386")), Opt("darwin", Not("cgo"))),
SetTags("linux", "darwin", "cgo"),
false,
},
{
And(Any(Term("linux"), Term("darwin")), Term("386")),
SetTags("darwin", "386"),
true,
},
}
for _, c := range cases {
got := c.Constraint.Evaluate(c.Values)
if c.Constraint.Validate() != nil && got {
t.Fatal("invalid expressions must evaluate false")
}
if got != c.Expect {
t.Errorf("%#v evaluated with %#v got %v expect %v", c.Constraint, c.Values, got, c.Expect)
}
}
}
func AssertParseConstraint(t *testing.T, expr string) Constraint {
t.Helper()
c, err := ParseConstraint(expr)
if err != nil {
t.Fatalf("error parsing expression %q: %q", expr, err)
}
return c
}
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