Bound every slog line against client-chosen text (closes #176)

internal/handlers/export_test.go

@@ -2,11 +2,19 @@ package handlers
 
 import (
 	"html/template"
+	"log/slog"
 	"net/http"
 
 	"sneak.berlin/go/webhooker/internal/database"
 )
 
+// SetLogForTest replaces the handler's logger, so the handlers_test
+// package can assert on what a log line actually contains rather than
+// on what it is meant to contain.
+func (s *Handlers) SetLogForTest(log *slog.Logger) {
+	s.log = log
+}
+
 // MaxRenderedBodyBytesForTest exposes the event log's body cap
 // to the handlers_test package.
 const MaxRenderedBodyBytesForTest = maxRenderedBodyBytes