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walk_test.go
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walk_test.go
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package syntax
import (
"testing"
"github.com/prometheus/prometheus/model/labels"
"github.com/stretchr/testify/require"
)
func Test_Walkable(t *testing.T) {
type table struct {
desc string
expr string
want int
}
tests := []table{
{
desc: "vector aggregate query",
expr: `sum by (cluster) (rate({job="foo"} |= "bar" | logfmt | bazz="buzz" [5m]))`,
want: 8,
},
{
desc: "bin op query",
expr: `(sum by(cluster)(rate({job="foo"} |= "bar" | logfmt | bazz="buzz"[5m])) / sum by(cluster)(rate({job="foo"} |= "bar" | logfmt | bazz="buzz"[5m])))`,
want: 16,
},
}
for _, test := range tests {
test := test
t.Run(test.desc, func(t *testing.T) {
expr, err := ParseExpr(test.expr)
require.Nil(t, err)
var cnt int
expr.Walk(func(_ Expr) { cnt++ })
require.Equal(t, test.want, cnt)
})
}
}
func Test_AppendMatchers(t *testing.T) {
type table struct {
desc string
expr string
want string
matchers []*labels.Matcher
}
tests := []table{
{
desc: "vector range query",
expr: `sum by(cluster)(rate({job="foo"} |= "bar" | logfmt | bazz="buzz"[5m]))`,
want: `sum by (cluster)(rate({job="foo", namespace="a"} |= "bar" | logfmt | bazz="buzz"[5m]))`,
matchers: []*labels.Matcher{
{
Name: "namespace",
Type: labels.MatchEqual,
Value: "a",
},
},
},
{
desc: "bin op query",
expr: `sum by(cluster)(rate({job="foo"} |= "bar" | logfmt | bazz="buzz"[5m])) / sum by(cluster)(rate({job="foo"} |= "bar" | logfmt | bazz="buzz"[5m]))`,
want: `(sum by (cluster)(rate({job="foo", namespace="a"} |= "bar" | logfmt | bazz="buzz"[5m])) / sum by (cluster)(rate({job="foo", namespace="a"} |= "bar" | logfmt | bazz="buzz"[5m])))`,
matchers: []*labels.Matcher{
{
Name: "namespace",
Type: labels.MatchEqual,
Value: "a",
},
},
},
}
for _, test := range tests {
test := test
t.Run(test.desc, func(t *testing.T) {
expr, err := ParseExpr(test.expr)
require.NoError(t, err)
expr.Walk(func(e Expr) {
switch me := e.(type) {
case *MatchersExpr:
me.AppendMatchers(test.matchers)
default:
// Do nothing
}
})
require.Equal(t, test.want, expr.String())
})
}
}