diff --git a/crates/pdf/src/lib.rs b/crates/pdf/src/lib.rs
index 7c766559..567dca9c 100644
--- a/crates/pdf/src/lib.rs
+++ b/crates/pdf/src/lib.rs
@@ -218,11 +218,3 @@ pub fn layer_doc_with_sizes(doc: &Doc, index: usize, retain: bool) -> (Doc, [f64
 
 #[cfg(test)]
 mod tests;
-#[cfg(test)]
-mod tests_groups;
-#[cfg(test)]
-mod tests_import;
-#[cfg(test)]
-mod tests_reader;
-#[cfg(test)]
-mod tests_shading;
diff --git a/crates/pdf/src/tests.rs b/crates/pdf/src/tests.rs
index 40f064af..2d09a740 100644
--- a/crates/pdf/src/tests.rs
+++ b/crates/pdf/src/tests.rs
@@ -4,6 +4,11 @@ use super::*;
 
 use crate::write::pdf;
 
+mod groups;
+mod import;
+mod reader;
+mod shading;
+
 const CONTENT: &str = "/OC /MC0 BDC\n0 1 0 rg 0 0 200 100 re f\nEMC\n\
 /OC /MC1 BDC\nq 10 10 80 80 re W n\n1 0 0 rg 0 0 50 100 re f\nQ\n\
 /Pattern cs /P0 scn 100 0 100 50 re f\n\
diff --git a/crates/pdf/src/tests_groups.rs b/crates/pdf/src/tests/groups.rs
similarity index 99%
rename from crates/pdf/src/tests_groups.rs
rename to crates/pdf/src/tests/groups.rs
index ce928139..e897d87c 100644
--- a/crates/pdf/src/tests_groups.rs
+++ b/crates/pdf/src/tests/groups.rs
@@ -1,7 +1,7 @@
 //! M13.12: transparency groups (isolated, knockout, group alpha) and soft masks on a group's
 //! combined result.
 
-use super::*;
+use crate::*;
 use crate::tests::{page_pdf, render};
 
 fn near(a: [f32; 4], b: [f32; 4]) -> bool {
diff --git a/crates/pdf/src/tests_import.rs b/crates/pdf/src/tests/import.rs
similarity index 99%
rename from crates/pdf/src/tests_import.rs
rename to crates/pdf/src/tests/import.rs
index 11ef72f8..01db74ef 100644
--- a/crates/pdf/src/tests_import.rs
+++ b/crates/pdf/src/tests/import.rs
@@ -1,7 +1,7 @@
 //! M13.12: CCITT images in PDF pages, EPS text and parser robustness over truncated and
 //! corrupt inputs (generated fixtures).
 
-use super::*;
+use crate::*;
 use crate::tests::{coverage, page_pdf, render, shape_names};
 
 fn eps(body: &[u8]) -> Doc {
diff --git a/crates/pdf/src/tests_reader.rs b/crates/pdf/src/tests/reader.rs
similarity index 100%
rename from crates/pdf/src/tests_reader.rs
rename to crates/pdf/src/tests/reader.rs
diff --git a/crates/pdf/src/tests_shading.rs b/crates/pdf/src/tests/shading.rs
similarity index 99%
rename from crates/pdf/src/tests_shading.rs
rename to crates/pdf/src/tests/shading.rs
index 12ca2ff8..8658efa2 100644
--- a/crates/pdf/src/tests_shading.rs
+++ b/crates/pdf/src/tests/shading.rs
@@ -1,6 +1,6 @@
 //! M13.12: function-based and mesh shadings (generated fixtures).
 
-use super::*;
+use crate::*;
 use crate::tests::{Objs, page_pdf, render};
 
 /// Mesh vertex data: 8-bit flags, 16-bit coordinates (Decode `[0 65535 0 65535 …]`, so raw