diff --git a/tests/writemode/source/modified.rs b/rustfmt-core/tests/writemode/source/modified.rs
similarity index 100%
rename from tests/writemode/source/modified.rs
rename to rustfmt-core/tests/writemode/source/modified.rs
diff --git a/tests/writemode/target/modified.txt b/rustfmt-core/tests/writemode/target/modified.txt
similarity index 100%
rename from tests/writemode/target/modified.txt
rename to rustfmt-core/tests/writemode/target/modified.txt