test: fix buffer writes on mips

Mips has a different way of handling NaN. This makes sure the tests
pass on MIPS as well.
PR-URL: #20377
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Author: BridgeAR

test/parallel/test-buffer-writedouble.js

@@ -67,10 +67,19 @@ assert.strictEqual(buffer.readDoubleLE(8), -Infinity);
 buffer.writeDoubleBE(NaN,0);
 buffer.writeDoubleLE(NaN,8);
 
-assert.ok(buffer.equals(newUint8Array([
-0x7F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,
-0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x7F
-])));
+// JS only knows a single NaN but there exist two platform specific
+// implementations. Therefore, allow both quiet and signalling NaNs.
+if(buffer[1]===0xF7){
+assert.ok(buffer.equals(newUint8Array([
+0x7F,0xF7,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xF7,0x7F
+])));
+}else{
+assert.ok(buffer.equals(newUint8Array([
+0x7F,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,
+0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x7F
+])));
+}
 
 assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
 assert.ok(Number.isNaN(buffer.readDoubleLE(8)));

test/parallel/test-buffer-writefloat.js

@@ -50,8 +50,18 @@ assert.strictEqual(buffer.readFloatLE(4), -Infinity);
 
 buffer.writeFloatBE(NaN,0);
 buffer.writeFloatLE(NaN,4);
-assert.ok(buffer.equals(
-newUint8Array([0x7F,0xC0,0x00,0x00,0x00,0x00,0xC0,0x7F])));
+
+// JS only knows a single NaN but there exist two platform specific
+// implementations. Therefore, allow both quiet and signalling NaNs.
+if(buffer[1]===0xBF){
+assert.ok(
+buffer.equals(newUint8Array(
+[0x7F,0xBF,0xFF,0xFF,0xFF,0xFF,0xBF,0x7F])));
+}else{
+assert.ok(
+buffer.equals(newUint8Array(
+[0x7F,0xC0,0x00,0x00,0x00,0x00,0xC0,0x7F])));
+}
 
 assert.ok(Number.isNaN(buffer.readFloatBE(0)));
 assert.ok(Number.isNaN(buffer.readFloatLE(4)));