Alerting: Refactor of state manager tests (#72849)

* calculate cacheID instead of literals
   * use mocked clocks
   * advance clocks with the eval results
   * use clearer timestamp aliases
   * make expected state labels be more clear to read
Co-authored-by: Matthew Jacobson <matthew.jacobson@grafana.com>

pkg/services/ngalert/eval/testing.go

@@ -67,6 +67,13 @@ func WithState(state State) ResultMutator {
 	}
 }
 
+func WithError(err error) ResultMutator {
+	return func(r *Result) {
+		r.State = Error
+		r.Error = err
+	}
+}
+
 func WithLabels(labels data.Labels) ResultMutator {
 	return func(r *Result) {
 		r.Instance = labels

pkg/services/ngalert/models/testing.go

@@ -179,6 +179,54 @@ func WithFor(duration time.Duration) AlertRuleMutator {
 	}
 }
 
+func WithForNTimes(timesOfInterval int64) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.For = time.Duration(rule.IntervalSeconds*timesOfInterval) * time.Second
+	}
+}
+
+func WithNoDataExecAs(nodata NoDataState) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.NoDataState = nodata
+	}
+}
+
+func WithErrorExecAs(err ExecutionErrorState) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.ExecErrState = err
+	}
+}
+
+func WithAnnotations(a data.Labels) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.Annotations = a
+	}
+}
+
+func WithAnnotation(key, value string) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		if rule.Annotations == nil {
+			rule.Annotations = data.Labels{}
+		}
+		rule.Annotations[key] = value
+	}
+}
+
+func WithLabels(a data.Labels) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.Labels = a
+	}
+}
+
+func WithLabel(key, value string) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		if rule.Labels == nil {
+			rule.Labels = data.Labels{}
+		}
+		rule.Labels[key] = value
+	}
+}
+
 func GenerateAlertLabels(count int, prefix string) data.Labels {
 	labels := make(data.Labels, count)
 	for i := 0; i < count; i++ {