diff --git a/test/mjsunit/wasm/streaming-error-position.js b/test/mjsunit/wasm/streaming-error-position.js
index a880aa9424..80a41481aa 100644
--- a/test/mjsunit/wasm/streaming-error-position.js
+++ b/test/mjsunit/wasm/streaming-error-position.js
@@ -8,10 +8,25 @@
 
 load('test/mjsunit/wasm/wasm-module-builder.js');
 
-function testErrorPosition(bytes, pos, test_name) {
+function testErrorPositionAsyncOnly(bytes, pos, message) {
+  let buffer = bytes.trunc_buffer();
+  // Only test the streaming decoder since this kind of error is out of sync
+  // with the non-streaming decoder, hence errors cannot be compared.
   assertThrowsAsync(
-      WebAssembly.compile(bytes.trunc_buffer()), WebAssembly.CompileError,
-      new RegExp('@\\+' + pos));
+      WebAssembly.compile(buffer), WebAssembly.CompileError,
+      new RegExp(message + '.*@\\+' + pos));
+}
+
+function testErrorPosition(bytes, pos, message) {
+  let buffer = bytes.trunc_buffer();
+  // First check the non-streaming decoder as a reference.
+  assertThrows(
+      () => new WebAssembly.Module(buffer), WebAssembly.CompileError,
+      new RegExp(message + '.*@\\+' + pos));
+  // Next test the actual streaming decoder.
+  assertThrowsAsync(
+      WebAssembly.compile(buffer), WebAssembly.CompileError,
+      new RegExp(message + '.*@\\+' + pos));
 }
 
 (function testInvalidMagic() {
@@ -20,7 +35,7 @@ function testErrorPosition(bytes, pos, test_name) {
     kWasmH0, kWasmH1 + 1, kWasmH2, kWasmH3, kWasmV0, kWasmV1, kWasmV2, kWasmV3
   ]);
   // Error at pos==0 because that's where the magic word is.
-  testErrorPosition(bytes, 0, 'testInvalidMagic');
+  testErrorPosition(bytes, 0, 'expected magic word');
 })();
 
 (function testInvalidVersion() {
@@ -29,7 +44,7 @@ function testErrorPosition(bytes, pos, test_name) {
     kWasmH0, kWasmH1, kWasmH2, kWasmH3, kWasmV0, kWasmV1 + 1, kWasmV2, kWasmV3
   ]);
   // Error at pos==4 because that's where the version word is.
-  testErrorPosition(bytes, 4, 'testInvalidVersion');
+  testErrorPosition(bytes, 4, 'expected version');
 })();
 
 (function testSectionLengthInvalidVarint() {
@@ -38,7 +53,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u8(kTypeSectionCode);
   bytes.emit_bytes([0x80, 0x80, 0x80, 0x80, 0x80, 0x00]);
   let pos = bytes.length - 1 - 1;
-  testErrorPosition(bytes, pos, 'testSectionLengthInvalidVarint');
+  testErrorPosition(bytes, pos, 'expected section length');
 })();
 
 (function testSectionLengthTooBig() {
@@ -47,7 +62,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u8(kTypeSectionCode);
   bytes.emit_u32v(0xffffff23);
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testSectionLengthTooBig');
+  testErrorPositionAsyncOnly(bytes, pos, 'maximum function size');
 })();
 
 (function testFunctionsCountInvalidVarint() {
@@ -71,7 +86,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_bytes([0x80, 0x80, 0x80, 0x80, 0x80, 0x00]);
 
   let pos = bytes.length - 1 - 1;
-  testErrorPosition(bytes, pos, 'testFunctionsCountInvalidVarint');
+  testErrorPositionAsyncOnly(bytes, pos, 'expected functions count');
 })();
 
 (function testFunctionsCountTooBig() {
@@ -95,7 +110,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u32v(0xffffff23);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testFunctionsCountTooBig');
+  testErrorPositionAsyncOnly(bytes, pos, 'maximum function size');
 })();
 
 (function testFunctionsCountDoesNotMatch() {
@@ -119,7 +134,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u32v(5);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testFunctionsCountDoesNotMatch');
+  testErrorPositionAsyncOnly(bytes, pos, 'function body count 5 mismatch');
 })();
 
 (function testBodySizeInvalidVarint() {
@@ -148,7 +163,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_bytes([0x80, 0x80, 0x80, 0x80, 0x80, 0x00]);
 
   let pos = bytes.length - 1 - 1;
-  testErrorPosition(bytes, pos, 'testBodySizeInvalidVarint');
+  testErrorPositionAsyncOnly(bytes, pos, 'expected body size');
 })();
 
 (function testBodySizeTooBig() {
@@ -177,7 +192,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u32v(0xffffff23);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testBodySizeTooBig');
+  testErrorPositionAsyncOnly(bytes, pos, 'maximum function size');
 })();
 
 (function testBodySizeDoesNotFit() {
@@ -206,7 +221,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u32v(20);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testBodySizeDoesNotFit');
+  testErrorPositionAsyncOnly(bytes, pos, 'not enough code section bytes');
 })();
 
 (function testBodySizeIsZero() {
@@ -235,7 +250,7 @@ function testErrorPosition(bytes, pos, test_name) {
   bytes.emit_u32v(0);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testBodySizeIsZero');
+  testErrorPositionAsyncOnly(bytes, pos, 'invalid function length');
 })();
 
 (function testStaleCodeSectionBytes() {
@@ -265,7 +280,7 @@ function testErrorPosition(bytes, pos, test_name) {
   ]);
 
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testStaleCodeSectionBytes');
+  testErrorPositionAsyncOnly(bytes, pos, 'not all code section bytes were used');
 })();
 
 (function testInvalidCode() {
@@ -297,7 +312,7 @@ function testErrorPosition(bytes, pos, test_name) {
 
   // Find error at the index of kExprLocalGet.
   let pos = bytes.length - 1 - 1;
-  testErrorPosition(bytes, pos, 'testInvalidCode');
+  testErrorPosition(bytes, pos, 'invalid local index');
 })();
 
 (function testCodeSectionRepeats() {
@@ -336,7 +351,7 @@ function testErrorPosition(bytes, pos, test_name) {
   ]);
 
   // Find error at the second kCodeSectionCode.
-  testErrorPosition(bytes, pos, 'testCodeSectionRepeats');
+  testErrorPositionAsyncOnly(bytes, pos, 'code section can only appear once');
 })();
 
 (function testCodeSectionSizeZero() {
@@ -363,7 +378,7 @@ function testErrorPosition(bytes, pos, test_name) {
 
   // Find error at the code section length.
   let pos = bytes.length - 1;
-  testErrorPosition(bytes, pos, 'testCodeSectionSizeZero');
+  testErrorPositionAsyncOnly(bytes, pos, 'code section cannot have size 0');
 })();
 
 (function testInvalidSection() {
@@ -380,5 +395,5 @@ function testErrorPosition(bytes, pos, test_name) {
   ]);
 
   let pos = bytes.length - 1 - 1;
-  testErrorPosition(bytes, pos, 'testInvalidSection');
+  testErrorPositionAsyncOnly(bytes, pos, 'invalid local type');
 })();