diff --git a/implementations/javascript/packages/core/test/reader.test.ts b/implementations/javascript/packages/core/test/reader.test.ts
index 90e76e9..35b6568 100644
--- a/implementations/javascript/packages/core/test/reader.test.ts
+++ b/implementations/javascript/packages/core/test/reader.test.ts
@@ -6,10 +6,10 @@ import * as fs from 'fs';
 
 describe('reading common test suite', () => {
     const samples_bin = fs.readFileSync(__dirname + '/../../../../../tests/samples.bin');
-    const samples_txt = fs.readFileSync(__dirname + '/../../../../../tests/samples.txt', 'utf-8');
+    const samples_pr = fs.readFileSync(__dirname + '/../../../../../tests/samples.pr', 'utf-8');
 
     it('should read equal to decoded binary without annotations', () => {
-        const s1 = new Reader(samples_txt, { decodePointer: readPointer, includeAnnotations: false }).next();
+        const s1 = new Reader(samples_pr, { decodePointer: readPointer, includeAnnotations: false }).next();
         const s2 = new Decoder(samples_bin, { includeAnnotations: false }).withPointerDecoder(
             decodePointer,
             d => d.next());
@@ -17,7 +17,7 @@ describe('reading common test suite', () => {
     });
 
     it('should read equal to decoded binary with annotations', () => {
-        const s1 = new Reader(samples_txt, { decodePointer: readPointer, includeAnnotations: true }).next();
+        const s1 = new Reader(samples_pr, { decodePointer: readPointer, includeAnnotations: true }).next();
         const s2 = new Decoder(samples_bin, { includeAnnotations: true }).withPointerDecoder(
             decodePointer,
             d => d.next());
@@ -25,7 +25,7 @@ describe('reading common test suite', () => {
     });
 
     it('should read and encode back to binary with annotations', () => {
-        const s = new Reader(samples_txt, { decodePointer: readPointer, includeAnnotations: true }).next();
+        const s = new Reader(samples_pr, { decodePointer: readPointer, includeAnnotations: true }).next();
         const bs = Bytes.toIO(encode(s, {
             encodePointer,
             includeAnnotations: true,
diff --git a/tests/Makefile b/tests/Makefile
index 97d831d..a0010ab 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,6 +1,6 @@
 all: samples.bin
 
-samples.bin: samples.txt
+samples.bin: samples.pr
 	racket ../implementations/racket/preserves/preserves/tool.rkt --atob < $< > $@.tmp || (rm -f $@.tmp; false)
 	mv $@.tmp $@
 
diff --git a/tests/samples.txt b/tests/samples.pr
similarity index 100%
rename from tests/samples.txt
rename to tests/samples.pr