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promqltest: improve error messages when unexpected type is returned, and fix inverted expected and actual values in error message when scalar value does not match expected

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Signed-off-by: Charles Korn <charles.korn@grafana.com>
This commit is contained in:
Charles Korn 2024-08-16 13:37:05 +10:00
parent c2bc6cfe97
commit 6548421f61
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2 changed files with 55 additions and 6 deletions
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20
promql/promqltest/test.go
View file

@ -651,6 +651,7 @@ type evalCmd struct {
expectedFailRegexp *regexp.Regexp
metrics map[uint64]labels.Labels
expectScalar bool
expected map[uint64]entry
}
@ -695,12 +696,15 @@ func (ev *evalCmd) String() string {
// expect adds a sequence of values to the set of expected
// results for the query.
func (ev *evalCmd) expect(pos int, vals ...parser.SequenceValue) {
ev.expectScalar = true
ev.expected[0] = entry{pos: pos, vals: vals}
}
// expectMetric adds a new metric with a sequence of values to the set of expected
// results for the query.
func (ev *evalCmd) expectMetric(pos int, m labels.Labels, vals ...parser.SequenceValue) {
ev.expectScalar = false
h := m.Hash()
ev.metrics[h] = m
ev.expected[h] = entry{pos: pos, vals: vals}
@ -714,6 +718,10 @@ func (ev *evalCmd) compareResult(result parser.Value) error {
return fmt.Errorf("expected ordered result, but query returned a matrix")
}
if ev.expectScalar {
return fmt.Errorf("expected scalar result, but got matrix %s", val.String())
}
if err := assertMatrixSorted(val); err != nil {
return err
}
@ -782,6 +790,10 @@ func (ev *evalCmd) compareResult(result parser.Value) error {
}
case promql.Vector:
if ev.expectScalar {
return fmt.Errorf("expected scalar result, but got vector %s", val.String())
}
seen := map[uint64]bool{}
for pos, v := range val {
fp := v.Metric.Hash()
@ -820,15 +832,15 @@ func (ev *evalCmd) compareResult(result parser.Value) error {
}
case promql.Scalar:
if len(ev.expected) != 1 {
return fmt.Errorf("expected vector result, but got scalar %s", val.String())
if !ev.expectScalar {
return fmt.Errorf("expected vector or matrix result, but got %s", val.String())
}
exp0 := ev.expected[0].vals[0]
if exp0.Histogram != nil {
return fmt.Errorf("expected Histogram %v but got scalar %s", exp0.Histogram.TestExpression(), val.String())
return fmt.Errorf("expected histogram %v but got %s", exp0.Histogram.TestExpression(), val.String())
}
if !almost.Equal(exp0.Value, val.V, defaultEpsilon) {
return fmt.Errorf("expected Scalar %v but got %v", val.V, exp0.Value)
return fmt.Errorf("expected scalar %v but got %v", exp0.Value, val.V)
}
default:

37
promql/promqltest/test_test.go
View file

@ -554,6 +554,43 @@ eval range from 0 to 5m step 5m testmetric
`,
expectedError: `error in eval testmetric (line 5): expected float value at index 0 for {__name__="testmetric"} to have timestamp 300000, but it had timestamp 0 (result has 1 float point [3 @[0]] and 1 histogram point [{count:0, sum:0} @[300000]])`,
},
"instant query with expected scalar result": {
input: `
eval instant at 1m 3
3
`,
},
"instant query with unexpected scalar result": {
input: `
eval instant at 1m 3
2
`,
expectedError: `error in eval 3 (line 2): expected scalar 2 but got 3`,
},
"instant query that returns a scalar but expects a vector": {
input: `
eval instant at 1m 3
{} 3
`,
expectedError: `error in eval 3 (line 2): expected vector or matrix result, but got scalar: 3 @[60000]`,
},
"instant query that returns a vector but expects a scalar": {
input: `
eval instant at 1m vector(3)
3
`,
expectedError: `error in eval vector(3) (line 2): expected scalar result, but got vector {} => 3 @[60000]`,
},
"range query that returns a matrix but expects a scalar": {
input: `
eval range from 0 to 1m step 30s vector(3)
3
`,
expectedError: `error in eval vector(3) (line 2): expected scalar result, but got matrix {} =>
3 @[0]
3 @[30000]
3 @[60000]`,
},
}
for name, testCase := range testCases {