diff --git a/tests/functional/repl.sh b/tests/functional/repl.sh
index c1f265df308..4f5bb36aae9 100755
--- a/tests/functional/repl.sh
+++ b/tests/functional/repl.sh
@@ -74,21 +74,31 @@ testReplResponseGeneral () {
     local grepMode commands expectedResponse response
     grepMode="$1"; shift
     commands="$1"; shift
-    expectedResponse="$1"; shift
-    response="$(nix repl "$@" <<< "$commands" | stripColors)"
-    echo "$response" | grepQuiet "$grepMode" -s "$expectedResponse" \
-      || fail "repl command set:
+    # Expected response can contain newlines.
+    # grep can't handle multiline patterns, so replace newlines with TEST_NEWLINE
+    # in both expectedResponse and response.
+    # awk ORS always adds a trailing record separator, so we strip it with sed.
+    expectedResponse="$(printf '%s' "$1" | awk 1 ORS=TEST_NEWLINE | sed 's/TEST_NEWLINE$//')"; shift
+    # We don't need to strip trailing record separator here, since extra data is ok.
+    response="$(nix repl "$@" <<< "$commands" 2>&1 | stripColors | awk 1 ORS=TEST_NEWLINE)"
+    printf '%s' "$response" | grepQuiet "$grepMode" -s "$expectedResponse" \
+      || fail "$(echo "repl command set:
 
 $commands
 
 does not respond with:
 
+---
 $expectedResponse
+---
 
 but with:
 
+---
 $response
-"
+---
+
+" | sed 's/TEST_NEWLINE/\n/g')"
 }
 
 testReplResponse () {
@@ -190,7 +200,7 @@ testReplResponseNoRegex '
 let x = { y = { a = 1; }; inherit x; }; in x
 ' \
 '{
-  x = { ... };
+  x = «repeated»;
   y = { ... };
 }
 '
@@ -242,7 +252,7 @@ testReplResponseNoRegex '
 ' \
 '{
   x = «repeated»;
-  y = { a = 1 };
+  y = { a = 1; };
 }
 '
 
@@ -256,7 +266,7 @@ runRepl () {
 
   # That is right, we are also filtering out the testdir _without underscores_.
   # This is crazy, but without it, GHA will fail to run the tests, showing paths
-  # _with_ underscores in the set -x log, but _without_ underscores in the 
+  # _with_ underscores in the set -x log, but _without_ underscores in the
   # supposed nix repl output. I have looked in a number of places, but I cannot
   # find a mechanism that could cause this to happen.
   local testDirNoUnderscores