diff --git a/martin/src/sprites/mod.rs b/martin/src/sprites/mod.rs
index e78fb0902..5d96f13b7 100644
--- a/martin/src/sprites/mod.rs
+++ b/martin/src/sprites/mod.rs
@@ -255,7 +255,7 @@ mod tests {
 
         //.sdf => generate sdf from png, add sdf == true
         //- => does not generate sdf, omits sdf == true
-        for extension in [".sdf", ""] {
+        for extension in ["_sdf", ""] {
             test_src(sprites.values(), 1, "all_1", extension).await;
             test_src(sprites.values(), 2, "all_2", extension).await;
 
@@ -276,7 +276,7 @@ mod tests {
         let path = PathBuf::from(format!(
             "../tests/fixtures/sprites/expected/{filename}{extension}"
         ));
-        let sprites = get_spritesheet(sources, pixel_ratio, extension == ".sdf")
+        let sprites = get_spritesheet(sources, pixel_ratio, extension == "_sdf")
             .await
             .unwrap();
         let mut json = serde_json::to_string_pretty(sprites.get_index()).unwrap();
diff --git a/tests/fixtures/sprites/expected/all_1_sdf.json b/tests/fixtures/sprites/expected/all_1_sdf.json
new file mode 100644
index 000000000..1ca1cd595
--- /dev/null
+++ b/tests/fixtures/sprites/expected/all_1_sdf.json
@@ -0,0 +1,34 @@
+{
+  "another_bicycle": {
+    "height": 15,
+    "pixelRatio": 1,
+    "width": 15,
+    "x": 20,
+    "y": 16,
+    "sdf": true
+  },
+  "bear": {
+    "height": 16,
+    "pixelRatio": 1,
+    "width": 16,
+    "x": 20,
+    "y": 0,
+    "sdf": true
+  },
+  "bicycle": {
+    "height": 15,
+    "pixelRatio": 1,
+    "width": 15,
+    "x": 35,
+    "y": 16,
+    "sdf": true
+  },
+  "sub/circle": {
+    "height": 20,
+    "pixelRatio": 1,
+    "width": 20,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/all_1_sdf.png b/tests/fixtures/sprites/expected/all_1_sdf.png
new file mode 100644
index 000000000..ffb354692
Binary files /dev/null and b/tests/fixtures/sprites/expected/all_1_sdf.png differ
diff --git a/tests/fixtures/sprites/expected/all_2_sdf.json b/tests/fixtures/sprites/expected/all_2_sdf.json
new file mode 100644
index 000000000..5d1fb2e53
--- /dev/null
+++ b/tests/fixtures/sprites/expected/all_2_sdf.json
@@ -0,0 +1,34 @@
+{
+  "another_bicycle": {
+    "height": 30,
+    "pixelRatio": 2,
+    "width": 30,
+    "x": 40,
+    "y": 32,
+    "sdf": true
+  },
+  "bear": {
+    "height": 32,
+    "pixelRatio": 2,
+    "width": 32,
+    "x": 40,
+    "y": 0,
+    "sdf": true
+  },
+  "bicycle": {
+    "height": 30,
+    "pixelRatio": 2,
+    "width": 30,
+    "x": 70,
+    "y": 32,
+    "sdf": true
+  },
+  "sub/circle": {
+    "height": 40,
+    "pixelRatio": 2,
+    "width": 40,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/all_2_sdf.png b/tests/fixtures/sprites/expected/all_2_sdf.png
new file mode 100644
index 000000000..e1ce6514b
Binary files /dev/null and b/tests/fixtures/sprites/expected/all_2_sdf.png differ
diff --git a/tests/fixtures/sprites/expected/src1_1_sdf.json b/tests/fixtures/sprites/expected/src1_1_sdf.json
new file mode 100644
index 000000000..05675714b
--- /dev/null
+++ b/tests/fixtures/sprites/expected/src1_1_sdf.json
@@ -0,0 +1,26 @@
+{
+  "another_bicycle": {
+    "height": 15,
+    "pixelRatio": 1,
+    "width": 15,
+    "x": 20,
+    "y": 16,
+    "sdf": true
+  },
+  "bear": {
+    "height": 16,
+    "pixelRatio": 1,
+    "width": 16,
+    "x": 20,
+    "y": 0,
+    "sdf": true
+  },
+  "sub/circle": {
+    "height": 20,
+    "pixelRatio": 1,
+    "width": 20,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/src1_1_sdf.png b/tests/fixtures/sprites/expected/src1_1_sdf.png
new file mode 100644
index 000000000..b3c301e82
Binary files /dev/null and b/tests/fixtures/sprites/expected/src1_1_sdf.png differ
diff --git a/tests/fixtures/sprites/expected/src1_2_sdf.json b/tests/fixtures/sprites/expected/src1_2_sdf.json
new file mode 100644
index 000000000..1430954ff
--- /dev/null
+++ b/tests/fixtures/sprites/expected/src1_2_sdf.json
@@ -0,0 +1,26 @@
+{
+  "another_bicycle": {
+    "height": 30,
+    "pixelRatio": 2,
+    "width": 30,
+    "x": 40,
+    "y": 32,
+    "sdf": true
+  },
+  "bear": {
+    "height": 32,
+    "pixelRatio": 2,
+    "width": 32,
+    "x": 40,
+    "y": 0,
+    "sdf": true
+  },
+  "sub/circle": {
+    "height": 40,
+    "pixelRatio": 2,
+    "width": 40,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/src1_2_sdf.png b/tests/fixtures/sprites/expected/src1_2_sdf.png
new file mode 100644
index 000000000..c291da958
Binary files /dev/null and b/tests/fixtures/sprites/expected/src1_2_sdf.png differ
diff --git a/tests/fixtures/sprites/expected/src2_1_sdf.json b/tests/fixtures/sprites/expected/src2_1_sdf.json
new file mode 100644
index 000000000..a7f71e2be
--- /dev/null
+++ b/tests/fixtures/sprites/expected/src2_1_sdf.json
@@ -0,0 +1,10 @@
+{
+  "bicycle": {
+    "height": 15,
+    "pixelRatio": 1,
+    "width": 15,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/src2_1_sdf.png b/tests/fixtures/sprites/expected/src2_1_sdf.png
new file mode 100644
index 000000000..db2640780
Binary files /dev/null and b/tests/fixtures/sprites/expected/src2_1_sdf.png differ
diff --git a/tests/fixtures/sprites/expected/src2_2_sdf.json b/tests/fixtures/sprites/expected/src2_2_sdf.json
new file mode 100644
index 000000000..8cd9eaa1a
--- /dev/null
+++ b/tests/fixtures/sprites/expected/src2_2_sdf.json
@@ -0,0 +1,10 @@
+{
+  "bicycle": {
+    "height": 30,
+    "pixelRatio": 2,
+    "width": 30,
+    "x": 0,
+    "y": 0,
+    "sdf": true
+  }
+}
diff --git a/tests/fixtures/sprites/expected/src2_2_sdf.png b/tests/fixtures/sprites/expected/src2_2_sdf.png
new file mode 100644
index 000000000..7c947fd36
Binary files /dev/null and b/tests/fixtures/sprites/expected/src2_2_sdf.png differ