diff --git a/tests/config/issue-3956.toml b/tests/config/issue-3956.toml
new file mode 100644
index 00000000000..7669890586b
--- /dev/null
+++ b/tests/config/issue-3956.toml
@@ -0,0 +1,5 @@
+ignore = [
+  "tests/**/issue-3956/graphics.rs",
+  "tests/**/issue-3956/graphics_emu.rs"
+]
+recursive = true
diff --git a/tests/target/issue-3956/graphics.rs b/tests/target/issue-3956/graphics.rs
new file mode 100644
index 00000000000..ea98ccf2349
--- /dev/null
+++ b/tests/target/issue-3956/graphics.rs
@@ -0,0 +1,2 @@
+// rustfmt-config: issue-3956.toml
+pub struct A;
diff --git a/tests/target/issue-3956/graphics_emu.rs b/tests/target/issue-3956/graphics_emu.rs
new file mode 100644
index 00000000000..88e41b515dc
--- /dev/null
+++ b/tests/target/issue-3956/graphics_emu.rs
@@ -0,0 +1,2 @@
+// rustfmt-config: issue-3956.toml
+pub struct B;
diff --git a/tests/target/issue-3956/lib.rs b/tests/target/issue-3956/lib.rs
new file mode 100644
index 00000000000..b0a26c9f0ba
--- /dev/null
+++ b/tests/target/issue-3956/lib.rs
@@ -0,0 +1,4 @@
+// rustfmt-config: issue-3956.toml
+#[cfg_attr(windows, path = "graphics.rs")]
+#[cfg_attr(not(windows), path = "graphics_emu.rs")]
+mod graphics;