diff --git a/test/built-ins/DataView/prototype/getBigInt64/return-values-custom-offset.js b/test/built-ins/DataView/prototype/getBigInt64/return-values-custom-offset.js
index 02455952b0..307ef959f6 100644
--- a/test/built-ins/DataView/prototype/getBigInt64/return-values-custom-offset.js
+++ b/test/built-ins/DataView/prototype/getBigInt64/return-values-custom-offset.js
@@ -36,33 +36,33 @@ features: [DataView, ArrayBuffer, DataView.prototype.setUint8, BigInt]
 var buffer = new ArrayBuffer(16);
 var sample = new DataView(buffer, 0);
 
-sample.setUint8(0, 39);
-sample.setUint8(1, 2);
-sample.setUint8(2, 6);
-sample.setUint8(3, 2);
-sample.setUint8(4, 128);
-sample.setUint8(5, 0);
-sample.setUint8(6, 128);
-sample.setUint8(7, 1);
-sample.setUint8(8, 127);
-sample.setUint8(9, 0);
-sample.setUint8(10, 1);
-sample.setUint8(11, 2);
-sample.setUint8(12, 128);
-sample.setUint8(13, 127);
-sample.setUint8(14, 255);
-sample.setUint8(15, 128);
+sample.setUint8(0, 0x27);
+sample.setUint8(1, 0x02);
+sample.setUint8(2, 0x06);
+sample.setUint8(3, 0x02);
+sample.setUint8(4, 0x80);
+sample.setUint8(5, 0x00);
+sample.setUint8(6, 0x80);
+sample.setUint8(7, 0x01);
+sample.setUint8(8, 0x7f);
+sample.setUint8(9, 0x00);
+sample.setUint8(10, 0x01);
+sample.setUint8(11, 0x02);
+sample.setUint8(12, 0x80);
+sample.setUint8(13, 0x7f);
+sample.setUint8(14, 0xff);
+sample.setUint8(15, 0x80);
 
 sample = new DataView(buffer, 4);
 
-assert.sameValue(sample.getBigInt64(0, false), -9223231292940746494n, "0, false");
-assert.sameValue(sample.getBigInt64(1, false) , 36030441991504512n, "1, false");
-assert.sameValue(sample.getBigInt64(2, false) , -9222950923884396417n, "2, false");
-assert.sameValue(sample.getBigInt64(3, false) , 107804920417124351n, "3, false");
-assert.sameValue(sample.getBigInt64(4, false) , 9151315553074282368n, "4, false");
+assert.sameValue(sample.getBigInt64(0, false), -0x7fff7ffe80fffefen, "0, false");
+assert.sameValue(sample.getBigInt64(1, false), 0x80017f00010280n, "1, false");
+assert.sameValue(sample.getBigInt64(2, false), -0x7ffe80fffefd7f81n, "2, false");
+assert.sameValue(sample.getBigInt64(3, false), 0x17f000102807fffn, "3, false");
+assert.sameValue(sample.getBigInt64(4, false), 0x7f000102807fff80n, "4, false");
 
-assert.sameValue(sample.getBigInt64(0, true)  , 144397208538579072n, "0, true");
-assert.sameValue(sample.getBigInt64(1, true) , -9222807985258921984n, "1, true");
-assert.sameValue(sample.getBigInt64(2, true) , 9187345443162358144n, "2, true");
-assert.sameValue(sample.getBigInt64(3, true) , -36169525900574975n, "3, true");
-assert.sameValue(sample.getBigInt64(4, true) , -9151455730027396993n, "4, true");
+assert.sameValue(sample.getBigInt64(0, true), 0x201007f01800080n, "0, true");
+assert.sameValue(sample.getBigInt64(1, true), -0x7ffdfeff80fe8000n, "1, true");
+assert.sameValue(sample.getBigInt64(2, true), 0x7f800201007f0180n, "2, true");
+assert.sameValue(sample.getBigInt64(3, true), -0x807ffdfeff80ffn, "3, true");
+assert.sameValue(sample.getBigInt64(4, true), -0x7f00807ffdfeff81n, "4, true");
diff --git a/test/built-ins/DataView/prototype/getBigInt64/return-values.js b/test/built-ins/DataView/prototype/getBigInt64/return-values.js
index b07168a3b7..0199389352 100644
--- a/test/built-ins/DataView/prototype/getBigInt64/return-values.js
+++ b/test/built-ins/DataView/prototype/getBigInt64/return-values.js
@@ -31,39 +31,39 @@ features: [DataView, ArrayBuffer, DataView.prototype.setUint8, BigInt]
 var buffer = new ArrayBuffer(16);
 var sample = new DataView(buffer, 0);
 
-sample.setUint8(0, 39);
-sample.setUint8(1, 2);
-sample.setUint8(2, 6);
-sample.setUint8(3, 2);
-sample.setUint8(4, 128);
-sample.setUint8(5, 0);
-sample.setUint8(6, 128);
-sample.setUint8(7, 1);
-sample.setUint8(8, 127);
-sample.setUint8(9, 0);
-sample.setUint8(10, 1);
-sample.setUint8(11, 2);
-sample.setUint8(12, 128);
-sample.setUint8(13, 127);
-sample.setUint8(14, 255);
-sample.setUint8(15, 128);
+sample.setUint8(0, 0x27);
+sample.setUint8(1, 0x02);
+sample.setUint8(2, 0x06);
+sample.setUint8(3, 0x02);
+sample.setUint8(4, 0x80);
+sample.setUint8(5, 0x00);
+sample.setUint8(6, 0x80);
+sample.setUint8(7, 0x01);
+sample.setUint8(8, 0x7f);
+sample.setUint8(9, 0x00);
+sample.setUint8(10, 0x01);
+sample.setUint8(11, 0x02);
+sample.setUint8(12, 0x80);
+sample.setUint8(13, 0x7f);
+sample.setUint8(14, 0xff);
+sample.setUint8(15, 0x80);
 
-assert.sameValue(sample.getBigInt64(0, false), 2810815725239828481n, "0, false");
-assert.sameValue(sample.getBigInt64(1, false), 145806786723578239n, "1, false");
-assert.sameValue(sample.getBigInt64(2, false), 433049253816925952n, "2, false");
-assert.sameValue(sample.getBigInt64(3, false), 180144534875734017n, "3, false");
-assert.sameValue(sample.getBigInt64(4, false), -9223231292940746494n, "4, false");
-assert.sameValue(sample.getBigInt64(5, false), 36030441991504512n, "5, false");
-assert.sameValue(sample.getBigInt64(6, false), -9222950923884396417n, "6, false");
-assert.sameValue(sample.getBigInt64(7, false), 107804920417124351n, "7, false");
-assert.sameValue(sample.getBigInt64(8, false), 9151315553074282368n, "8, false");
+assert.sameValue(sample.getBigInt64(0, false), 0x2702060280008001n, "0, false");
+assert.sameValue(sample.getBigInt64(1, false), 0x20602800080017fn, "1, false");
+assert.sameValue(sample.getBigInt64(2, false), 0x602800080017f00n, "2, false");
+assert.sameValue(sample.getBigInt64(3, false), 0x2800080017f0001n, "3, false");
+assert.sameValue(sample.getBigInt64(4, false), -0x7fff7ffe80fffefen, "4, false");
+assert.sameValue(sample.getBigInt64(5, false), 0x80017f00010280n, "5, false");
+assert.sameValue(sample.getBigInt64(6, false), -0x7ffe80fffefd7f81n, "6, false");
+assert.sameValue(sample.getBigInt64(7, false), 0x17f000102807fffn, "7, false");
+assert.sameValue(sample.getBigInt64(8, false), 0x7f000102807fff80n, "8, false");
 
-assert.sameValue(sample.getBigInt64(0, true), 108086940846653991n, "0, true");
-assert.sameValue(sample.getBigInt64(1, true), 9151736657429530114n, "1, true");
-assert.sameValue(sample.getBigInt64(2, true), 35748971318084102n, "2, true");
-assert.sameValue(sample.getBigInt64(3, true), 72197238457139202n, "3, true");
-assert.sameValue(sample.getBigInt64(4, true), 144397208538579072n, "4, true");
-assert.sameValue(sample.getBigInt64(5, true), -9222807985258921984n, "5, true");
-assert.sameValue(sample.getBigInt64(6, true), 9187345443162358144n, "6, true");
-assert.sameValue(sample.getBigInt64(7, true), -36169525900574975n, "7, true");
-assert.sameValue(sample.getBigInt64(8, true), -9151455730027396993n, "8, true");
+assert.sameValue(sample.getBigInt64(0, true), 0x180008002060227n, "0, true");
+assert.sameValue(sample.getBigInt64(1, true), 0x7f01800080020602n, "1, true");
+assert.sameValue(sample.getBigInt64(2, true), 0x7f018000800206n, "2, true");
+assert.sameValue(sample.getBigInt64(3, true), 0x1007f0180008002n, "3, true");
+assert.sameValue(sample.getBigInt64(4, true), 0x201007f01800080n, "4, true");
+assert.sameValue(sample.getBigInt64(5, true), -0x7ffdfeff80fe8000n, "5, true");
+assert.sameValue(sample.getBigInt64(6, true), 0x7f800201007f0180n, "6, true");
+assert.sameValue(sample.getBigInt64(7, true), -0x807ffdfeff80ffn, "7, true");
+assert.sameValue(sample.getBigInt64(8, true), -0x7f00807ffdfeff81n, "8, true");
diff --git a/test/built-ins/DataView/prototype/getBigInt64/to-boolean-littleendian.js b/test/built-ins/DataView/prototype/getBigInt64/to-boolean-littleendian.js
index e6df8cdd42..01a3ce1da0 100644
--- a/test/built-ins/DataView/prototype/getBigInt64/to-boolean-littleendian.js
+++ b/test/built-ins/DataView/prototype/getBigInt64/to-boolean-littleendian.js
@@ -39,15 +39,15 @@ features: [DataView, ArrayBuffer, DataView.prototype.setUint8, BigInt, Symbol, S
 var buffer = new ArrayBuffer(8);
 var sample = new DataView(buffer, 0);
 
-sample.setUint8(7, 255);
+sample.setUint8(7, 0xff);
 
 // False
-assert.sameValue(sample.getBigInt64(0), 255n, "no argument");
+assert.sameValue(sample.getBigInt64(0), 0xffn, "no argument");
 testCoercibleToBooleanFalse(function (x) {
-  assert.sameValue(sample.getBigInt64(0, x), 255n);
+  assert.sameValue(sample.getBigInt64(0, x), 0xffn);
 });
 
 // True
 testCoercibleToBooleanTrue(function (x) {
-  assert.sameValue(sample.getBigInt64(0, x), -72057594037927936n);
+  assert.sameValue(sample.getBigInt64(0, x), -0x100000000000000n);
 });
diff --git a/test/built-ins/DataView/prototype/getBigInt64/toindex-byteoffset.js b/test/built-ins/DataView/prototype/getBigInt64/toindex-byteoffset.js
index 06661b1e20..6a6c569037 100644
--- a/test/built-ins/DataView/prototype/getBigInt64/toindex-byteoffset.js
+++ b/test/built-ins/DataView/prototype/getBigInt64/toindex-byteoffset.js
@@ -24,31 +24,31 @@ features: [DataView, ArrayBuffer, DataView.prototype.setUint8, BigInt, Symbol, S
 var buffer = new ArrayBuffer(12);
 var sample = new DataView(buffer, 0);
 
-sample.setUint8(0, 39);
-sample.setUint8(1, 2);
-sample.setUint8(2, 6);
-sample.setUint8(3, 2);
-sample.setUint8(4, 128);
-sample.setUint8(5, 0);
-sample.setUint8(6, 128);
-sample.setUint8(7, 1);
-sample.setUint8(8, 127);
-sample.setUint8(9, 0);
-sample.setUint8(10, 1);
-sample.setUint8(11, 2);
+sample.setUint8(0, 0x27);
+sample.setUint8(1, 0x02);
+sample.setUint8(2, 0x06);
+sample.setUint8(3, 0x02);
+sample.setUint8(4, 0x80);
+sample.setUint8(5, 0x00);
+sample.setUint8(6, 0x80);
+sample.setUint8(7, 0x01);
+sample.setUint8(8, 0x7f);
+sample.setUint8(9, 0x00);
+sample.setUint8(10, 0x01);
+sample.setUint8(11, 0x02);
 
 testCoercibleToIndexZero(function (x) {
-  assert.sameValue(sample.getBigInt64(x), 2810815725239828481n);
+  assert.sameValue(sample.getBigInt64(x), 0x2702060280008001n);
 });
 
 testCoercibleToIndexOne(function (x) {
-  assert.sameValue(sample.getBigInt64(x), 145806786723578239n);
+  assert.sameValue(sample.getBigInt64(x), 0x20602800080017fn);
 });
 
 testCoercibleToIndexFromIndex(2, function (x) {
-  assert.sameValue(sample.getBigInt64(x), 433049253816925952n);
+  assert.sameValue(sample.getBigInt64(x), 0x602800080017F00n);
 });
 
 testCoercibleToIndexFromIndex(3, function (x) {
-  assert.sameValue(sample.getBigInt64(x), 180144534875734017n);
+  assert.sameValue(sample.getBigInt64(x), 0x2800080017F0001n);
 });