test: improve internal/buffer.js test coverage · nodejs/node@17954c2

Original file line number	Diff line number	Diff line change
`@@ -169,7 +169,7 @@ const assert = require('assert');`
`169`	`169`	`});`
`170`	`170`
`171`	`171`	`// Test 1 to 6 bytes.`
`172`		`-for (let i = 1; i < 6; i++) {`
	`172`	`+for (let i = 1; i <= 6; i++) {`
`173`	`173`	`['readIntBE', 'readIntLE'].forEach((fn) => {`
`174`	`174`	`['', '0', null, {}, [], () => {}, true, false].forEach((o) => {`
`175`	`175`	`assert.throws(`

Original file line number	Diff line number	Diff line change
`@@ -130,7 +130,7 @@ const assert = require('assert');`
`130`	`130`	`});`
`131`	`131`
`132`	`132`	`// Test 1 to 6 bytes.`
`133`		`-for (let i = 1; i < 6; i++) {`
	`133`	`+for (let i = 1; i <= 6; i++) {`
`134`	`134`	`['readUIntBE', 'readUIntLE'].forEach((fn) => {`
`135`	`135`	`['', '0', null, {}, [], () => {}, true, false].forEach((o) => {`
`136`	`136`	`assert.throws(`

Original file line number	Diff line number	Diff line change
`@@ -162,6 +162,21 @@ const errorOutOfBounds = common.expectsError({`
`162`	`162`	`});`
`163`	`163`	`}`
`164`	`164`
	`165`	`+// Test 48 bit`
	`166`	`+{`
	`167`	`+const value = 0x1234567890ab;`
	`168`	`+const buffer = Buffer.allocUnsafe(6);`
	`169`	`+buffer.writeIntBE(value, 0, 6);`
	`170`	`+assert.ok(buffer.equals(new Uint8Array([`
	`171`	`+0x12, 0x34, 0x56, 0x78, 0x90, 0xab`
	`172`	`+])));`
	`173`	`+`
	`174`	`+buffer.writeIntLE(value, 0, 6);`
	`175`	`+assert.ok(buffer.equals(new Uint8Array([`
	`176`	`+0xab, 0x90, 0x78, 0x56, 0x34, 0x12`
	`177`	`+])));`
	`178`	`+}`
	`179`	`+`
`165`	`180`	`// Test Int`
`166`	`181`	`{`
`167`	`182`	`const data = Buffer.alloc(8);`

Original file line number	Diff line number	Diff line change
`@@ -110,6 +110,17 @@ const assert = require('assert');`
`110`	`110`	`assert.ok(data.equals(new Uint8Array([0x6d, 0x6d, 0x6d, 0x0a, 0xf9, 0xe7])));`
`111`	`111`	`}`
`112`	`112`
	`113`	`+// Test 48 bit`
	`114`	`+{`
	`115`	`+const value = 0x1234567890ab;`
	`116`	`+const data = Buffer.allocUnsafe(6);`
	`117`	`+data.writeUIntBE(value, 0, 6);`
	`118`	`+assert.ok(data.equals(new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab])));`
	`119`	`+`
	`120`	`+data.writeUIntLE(value, 0, 6);`
	`121`	`+assert.ok(data.equals(new Uint8Array([0xab, 0x90, 0x78, 0x56, 0x34, 0x12])));`
	`122`	`+}`
	`123`	`+`
`113`	`124`	`// Test UInt`
`114`	`125`	`{`
`115`	`126`	`const data = Buffer.alloc(8);`