refactor: extract some PromQL Engine tests which use unexported structs

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

promql/engine_internal_test.go

@@ -0,0 +1,82 @@
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package promql
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/go-kit/log"
+	"github.com/stretchr/testify/require"
+
+	"github.com/prometheus/prometheus/promql/parser"
+	"github.com/prometheus/prometheus/util/annotations"
+)
+
+func TestRecoverEvaluatorRuntime(t *testing.T) {
+	var output []interface{}
+	logger := log.Logger(log.LoggerFunc(func(keyvals ...interface{}) error {
+		output = append(output, keyvals...)
+		return nil
+	}))
+	ev := &evaluator{logger: logger}
+
+	expr, _ := parser.ParseExpr("sum(up)")
+
+	var err error
+
+	defer func() {
+		require.EqualError(t, err, "unexpected error: runtime error: index out of range [123] with length 0")
+		require.Contains(t, output, "sum(up)")
+	}()
+	defer ev.recover(expr, nil, &err)
+
+	// Cause a runtime panic.
+	var a []int
+	a[123] = 1
+}
+
+func TestRecoverEvaluatorError(t *testing.T) {
+	ev := &evaluator{logger: log.NewNopLogger()}
+	var err error
+
+	e := errors.New("custom error")
+
+	defer func() {
+		require.EqualError(t, err, e.Error())
+	}()
+	defer ev.recover(nil, nil, &err)
+
+	panic(e)
+}
+
+func TestRecoverEvaluatorErrorWithWarnings(t *testing.T) {
+	ev := &evaluator{logger: log.NewNopLogger()}
+	var err error
+	var ws annotations.Annotations
+
+	warnings := annotations.New().Add(errors.New("custom warning"))
+	e := errWithWarnings{
+		err:      errors.New("custom error"),
+		warnings: warnings,
+	}
+
+	defer func() {
+		require.EqualError(t, err, e.Error())
+		require.Equal(t, warnings, ws, "wrong warning message")
+	}()
+	defer ev.recover(nil, &ws, &err)
+
+	panic(e)
+}

promql/engine_test.go

@@ -23,8 +23,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/go-kit/log"
-
 	"github.com/stretchr/testify/require"
 	"go.uber.org/goleak"
 
@@ -1714,63 +1712,6 @@ load 1ms
 	}
 }
 
-func TestRecoverEvaluatorRuntime(t *testing.T) {
-	var output []interface{}
-	logger := log.Logger(log.LoggerFunc(func(keyvals ...interface{}) error {
-		output = append(output, keyvals...)
-		return nil
-	}))
-	ev := &evaluator{logger: logger}
-
-	expr, _ := parser.ParseExpr("sum(up)")
-
-	var err error
-
-	defer func() {
-		require.EqualError(t, err, "unexpected error: runtime error: index out of range [123] with length 0")
-		require.Contains(t, output, "sum(up)")
-	}()
-	defer ev.recover(expr, nil, &err)
-
-	// Cause a runtime panic.
-	var a []int
-	a[123] = 1
-}
-
-func TestRecoverEvaluatorError(t *testing.T) {
-	ev := &evaluator{logger: log.NewNopLogger()}
-	var err error
-
-	e := errors.New("custom error")
-
-	defer func() {
-		require.EqualError(t, err, e.Error())
-	}()
-	defer ev.recover(nil, nil, &err)
-
-	panic(e)
-}
-
-func TestRecoverEvaluatorErrorWithWarnings(t *testing.T) {
-	ev := &evaluator{logger: log.NewNopLogger()}
-	var err error
-	var ws annotations.Annotations
-
-	warnings := annotations.New().Add(errors.New("custom warning"))
-	e := errWithWarnings{
-		err:      errors.New("custom error"),
-		warnings: warnings,
-	}
-
-	defer func() {
-		require.EqualError(t, err, e.Error())
-		require.Equal(t, warnings, ws, "wrong warning message")
-	}()
-	defer ev.recover(nil, &ws, &err)
-
-	panic(e)
-}
-
 func TestSubquerySelector(t *testing.T) {
 	type caseType struct {
 		Query  string