Fix test that asserts on full log line

pkg/storage/ingest/pusher_test.go

@@ -5,6 +5,7 @@ package ingest
 import (
 	"context"
 	"fmt"
+	"regexp"
 	"strings"
 	"testing"
 
@@ -211,12 +212,25 @@ func TestPusherConsumer(t *testing.T) {
 			var logLines []string
 			if logsStr := logs.String(); logsStr != "" {
 				logLines = strings.Split(strings.TrimSpace(logsStr), "\n")
+				logLines = removeUnimportantLogFields(logLines)
 			}
 			assert.Equal(t, tc.expectedLogLines, logLines)
 		})
 	}
 }
 
+var unimportantLogFieldsPattern = regexp.MustCompile(`\scaller=\S+\.go:\d+\s`)
+
+func removeUnimportantLogFields(lines []string) []string {
+	// The 'caller' field is not important to these tests (we just care about the message and other information),
+	// and can change as we refactor code, making these tests brittle. So we remove it before making assertions about the log lines.
+	for i, line := range lines {
+		lines[i] = unimportantLogFieldsPattern.ReplaceAllString(line, " ")
+	}
+
+	return lines
+}
+
 func TestPusherConsumer_clientErrorSampling(t *testing.T) {
 	type testCase struct {
 		sampler         *util_log.Sampler