Fix subqueries with default resolution in promql unit tests

Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>

cmd/promtool/testdata/rules.yml

@@ -22,3 +22,7 @@ groups:
       # A recording rule that doesn't depend on input series.
       - record: fixed_data
         expr: 1
+
+      # Subquery with default resolution test.
+      - record: suquery_interval_test
+        expr: count_over_time(up[5m:])

cmd/promtool/unittest.go

@@ -157,6 +157,7 @@ func (tg *testGroup) test(evalInterval time.Duration, groupOrderMap map[string]i
 		return []error{err}
 	}
 	defer suite.Close()
+	suite.SubqueryInterval = evalInterval
 
 	// Load the rule files.
 	opts := &rules.ManagerOptions{

docs/configuration/unit_testing_rules.md

@@ -22,8 +22,7 @@ You can use `promtool` to test your rules.
 rule_files:
   [ - <file_name> ]
 
-# optional, default = 1m
-evaluation_interval: <duration>
+[ evaluation_interval: <duration> | default = 1m ]
 
 # The order in which group names are listed below will be the order of evaluation of
 # rule groups (at a given evaluation time). The order is guaranteed only for the groups mentioned below.

promql/test.go

@@ -658,6 +658,7 @@ type LazyLoader struct {
 	loadCmd *loadCmd
 
 	storage          storage.Storage
+	SubqueryInterval time.Duration
 
 	queryEngine *Engine
 	context     context.Context
@@ -714,6 +715,7 @@ func (ll *LazyLoader) clear() {
 		Reg:                      nil,
 		MaxSamples:               10000,
 		Timeout:                  100 * time.Second,
+		NoStepSubqueryIntervalFn: func(int64) int64 { return durationMilliseconds(ll.SubqueryInterval) },
 		EnableAtModifier:         true,
 	}