diff --git a/tests/README.md b/tests/README.md
index 7d9c3edac..424c97d8d 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -1,7 +1,10 @@
 # Tests
 
-- `typ`: Input files
-- `ref`: Reference images which the output is compared with to determine
-         whether a test passed or failed
-- `res`: Resource files used by tests
-- `out`: PNG and PDF files produced by tests
+- `typ`: Input files.
+- `ref`: Reference images which the output is compared with to determine whether
+         a test passed or failed. To keep things small, please run
+         `oxipng -o max tests/ref/<img>` when creating or updating reference
+         images (note that `<img>` can be `*` to optimize all images).
+- `res`: Resource files used by tests.
+- `out`: PNG and PDF files produced by tests.
+
diff --git a/tests/ref/page-body.png b/tests/ref/page-body.png
index a3b3d7264..09f685c33 100644
Binary files a/tests/ref/page-body.png and b/tests/ref/page-body.png differ
diff --git a/tests/ref/pagebreak.png b/tests/ref/pagebreak.png
new file mode 100644
index 000000000..50686ff97
Binary files /dev/null and b/tests/ref/pagebreak.png differ
diff --git a/tests/typ/image-error.typ b/tests/typ/image-error.typ
index 9a7f2c400..e6a989cac 100644
--- a/tests/typ/image-error.typ
+++ b/tests/typ/image-error.typ
@@ -1,11 +1,11 @@
 // Test error cases of the `image` function.
 
-// compare-ref: false
-// error: 8:9-8:30 failed to load image
-// error: 11:9-11:30 failed to load image
-
 // File does not exist.
 [image: "path/does/not/exist"]
 
 // File exists, but is no image.
 [image: "typ/image-error.typ"]
+
+// compare-ref: false
+// error: 4:9-4:30 failed to load image
+// error: 7:9-7:30 failed to load image
diff --git a/tests/typ/page-body.typ b/tests/typ/page-body.typ
index 6067dcfee..78e72d12b 100644
--- a/tests/typ/page-body.typ
+++ b/tests/typ/page-body.typ
@@ -6,6 +6,6 @@
 [page][Second]
 [pagebreak]
 Fourth
-[page][Fifth]
+[page][]
 Sixth
 [page][Seventh and last]
diff --git a/tests/typ/page-error.typ b/tests/typ/page-error.typ
index dee5c449d..e259a04e4 100644
--- a/tests/typ/page-error.typ
+++ b/tests/typ/page-error.typ
@@ -1,11 +1,11 @@
 // Test error cases of the `page` function.
 
-// compare-ref: false
-// error: 8:8-8:19 invalid paper
-// error: 11:17-11:20 aligned axis
-
 // Invalid paper.
 [page: nonexistant]
 
 // Aligned axes.
 [page: main-dir=ltr]
+
+// compare-ref: false
+// error: 4:8-4:19 invalid paper
+// error: 7:17-7:20 aligned axis
diff --git a/tests/typ/pagebreak.typ b/tests/typ/pagebreak.typ
new file mode 100644
index 000000000..7fd9aae2c
--- /dev/null
+++ b/tests/typ/pagebreak.typ
@@ -0,0 +1,5 @@
+// Test trailing pagebreak.
+
+First of two
+[pagebreak]
+[page: height=40pt]