diff options
Diffstat (limited to 'packages/contracts/test/libraries')
| -rw-r--r-- | packages/contracts/test/libraries/lib_bytes.ts | 228 | ||||
| -rw-r--r-- | packages/contracts/test/libraries/lib_mem.ts | 190 |
2 files changed, 407 insertions, 11 deletions
diff --git a/packages/contracts/test/libraries/lib_bytes.ts b/packages/contracts/test/libraries/lib_bytes.ts index dea45049e..2fefb7aeb 100644 --- a/packages/contracts/test/libraries/lib_bytes.ts +++ b/packages/contracts/test/libraries/lib_bytes.ts @@ -1,12 +1,13 @@ import { BlockchainLifecycle } from '@0xproject/dev-utils'; +import { assetProxyUtils, generatePseudoRandomSalt } from '@0xproject/order-utils'; import { BigNumber } from '@0xproject/utils'; import BN = require('bn.js'); import * as chai from 'chai'; import ethUtil = require('ethereumjs-util'); -import { TestLibBytesContract } from '../../src/contract_wrappers/generated/test_lib_bytes'; +import { TestLibBytesContract } from '../../src/generated_contract_wrappers/test_lib_bytes'; import { artifacts } from '../../src/utils/artifacts'; -import { expectRevertOrAlwaysFailingTransactionAsync, expectRevertOrOtherErrorAsync } from '../../src/utils/assertions'; +import { expectRevertOrOtherErrorAsync } from '../../src/utils/assertions'; import { chaiSetup } from '../../src/utils/chai_setup'; import { constants } from '../../src/utils/constants'; import { provider, txDefaults, web3Wrapper } from '../../src/utils/web3_wrapper'; @@ -28,6 +29,15 @@ describe('LibBytes', () => { let testAddress: string; const testBytes32 = '0x102030405060708090a0b0c0d0e0f0102030405060708090a0b0c0d0e0f01020'; const testUint256 = new BigNumber(testBytes32, 16); + let shortData: string; + let shortTestBytes: string; + let shortTestBytesAsBuffer: Buffer; + let wordOfData: string; + let wordOfTestBytes: string; + let wordOfTestBytesAsBuffer: Buffer; + let longData: string; + let longTestBytes: string; + let longTestBytesAsBuffer: Buffer; before(async () => { await blockchainLifecycle.startAsync(); @@ -48,6 +58,26 @@ describe('LibBytes', () => { expect(byteArrayLongerThan32BytesLength).to.be.greaterThan(32); const testBytes32Length = ethUtil.toBuffer(testBytes32).byteLength; expect(testBytes32Length).to.be.equal(32); + // Create short test bytes + shortData = '0xffffaa'; + const encodedShortData = ethUtil.toBuffer(shortData); + const shortDataLength = new BigNumber(encodedShortData.byteLength); + const encodedShortDataLength = assetProxyUtils.encodeUint256(shortDataLength); + shortTestBytesAsBuffer = Buffer.concat([encodedShortDataLength, encodedShortData]); + shortTestBytes = ethUtil.bufferToHex(shortTestBytesAsBuffer); + // Create test bytes one word in length + wordOfData = ethUtil.bufferToHex(assetProxyUtils.encodeUint256(generatePseudoRandomSalt())); + const encodedWordOfData = ethUtil.toBuffer(wordOfData); + const wordOfDataLength = new BigNumber(encodedWordOfData.byteLength); + const encodedWordOfDataLength = assetProxyUtils.encodeUint256(wordOfDataLength); + wordOfTestBytesAsBuffer = Buffer.concat([encodedWordOfDataLength, encodedWordOfData]); + wordOfTestBytes = ethUtil.bufferToHex(wordOfTestBytesAsBuffer); + // Create long test bytes (combines short test bytes with word of test bytes) + longData = ethUtil.bufferToHex(Buffer.concat([encodedShortData, encodedWordOfData])); + const longDataLength = new BigNumber(encodedShortData.byteLength + encodedWordOfData.byteLength); + const encodedLongDataLength = assetProxyUtils.encodeUint256(longDataLength); + longTestBytesAsBuffer = Buffer.concat([encodedLongDataLength, encodedShortData, encodedWordOfData]); + longTestBytes = ethUtil.bufferToHex(longTestBytesAsBuffer); }); beforeEach(async () => { await blockchainLifecycle.startAsync(); @@ -60,7 +90,7 @@ describe('LibBytes', () => { it('should revert if length is 0', async () => { return expectRevertOrOtherErrorAsync( libBytes.publicPopByte.callAsync(constants.NULL_BYTES), - constants.LIB_BYTES_GT_ZERO_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_THAN_ZERO_LENGTH_REQUIRED, ); }); @@ -77,7 +107,7 @@ describe('LibBytes', () => { it('should revert if length is less than 20', async () => { return expectRevertOrOtherErrorAsync( libBytes.publicPopAddress.callAsync(byteArrayShorterThan20Bytes), - constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED, ); }); @@ -163,7 +193,7 @@ describe('LibBytes', () => { const offset = new BigNumber(0); return expectRevertOrOtherErrorAsync( libBytes.publicReadAddress.callAsync(shortByteArray, offset), - constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED, ); }); @@ -172,7 +202,7 @@ describe('LibBytes', () => { const badOffset = new BigNumber(ethUtil.toBuffer(byteArray).byteLength); return expectRevertOrOtherErrorAsync( libBytes.publicReadAddress.callAsync(byteArray, badOffset), - constants.LIB_BYTES_GTE_20_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_20_LENGTH_REQUIRED, ); }); }); @@ -209,7 +239,7 @@ describe('LibBytes', () => { const offset = new BigNumber(0); return expectRevertOrOtherErrorAsync( libBytes.publicReadBytes32.callAsync(byteArrayShorterThan32Bytes, offset), - constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, ); }); @@ -217,7 +247,7 @@ describe('LibBytes', () => { const badOffset = new BigNumber(ethUtil.toBuffer(testBytes32).byteLength); return expectRevertOrOtherErrorAsync( libBytes.publicReadBytes32.callAsync(testBytes32, badOffset), - constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, ); }); }); @@ -258,7 +288,7 @@ describe('LibBytes', () => { const offset = new BigNumber(0); return expectRevertOrOtherErrorAsync( libBytes.publicReadUint256.callAsync(byteArrayShorterThan32Bytes, offset), - constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, ); }); @@ -269,7 +299,7 @@ describe('LibBytes', () => { const badOffset = new BigNumber(testUint256AsBuffer.byteLength); return expectRevertOrOtherErrorAsync( libBytes.publicReadUint256.callAsync(byteArray, badOffset), - constants.LIB_BYTES_GTE_32_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, ); }); }); @@ -291,7 +321,7 @@ describe('LibBytes', () => { const byteArrayLessThan4Bytes = '0x010101'; return expectRevertOrOtherErrorAsync( libBytes.publicReadFirst4.callAsync(byteArrayLessThan4Bytes), - constants.LIB_BYTES_GTE_4_LENGTH_REQUIRED, + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_4_LENGTH_REQUIRED, ); }); it('should return the first 4 bytes of a byte array of arbitrary length', async () => { @@ -300,4 +330,180 @@ describe('LibBytes', () => { expect(first4Bytes).to.equal(expectedFirst4Bytes); }); }); + + describe('readBytes', () => { + it('should successfully read short, nested array of bytes when it takes up the whole array', async () => { + const testBytesOffset = new BigNumber(0); + const bytes = await libBytes.publicReadBytes.callAsync(shortTestBytes, testBytesOffset); + return expect(bytes).to.be.equal(shortData); + }); + + it('should successfully read short, nested array of bytes when it is offset in the array', async () => { + const prefixByteArrayBuffer = ethUtil.toBuffer('0xabcdef'); + const combinedByteArrayBuffer = Buffer.concat([prefixByteArrayBuffer, shortTestBytesAsBuffer]); + const combinedByteArray = ethUtil.bufferToHex(combinedByteArrayBuffer); + const testUint256Offset = new BigNumber(prefixByteArrayBuffer.byteLength); + const bytes = await libBytes.publicReadBytes.callAsync(combinedByteArray, testUint256Offset); + return expect(bytes).to.be.equal(shortData); + }); + + it('should successfully read a nested array of bytes - one word in length - when it takes up the whole array', async () => { + const testBytesOffset = new BigNumber(0); + const bytes = await libBytes.publicReadBytes.callAsync(wordOfTestBytes, testBytesOffset); + return expect(bytes).to.be.equal(wordOfData); + }); + + it('should successfully read a nested array of bytes - one word in length - when it is offset in the array', async () => { + const prefixByteArrayBuffer = ethUtil.toBuffer('0xabcdef'); + const combinedByteArrayBuffer = Buffer.concat([prefixByteArrayBuffer, wordOfTestBytesAsBuffer]); + const combinedByteArray = ethUtil.bufferToHex(combinedByteArrayBuffer); + const testUint256Offset = new BigNumber(prefixByteArrayBuffer.byteLength); + const bytes = await libBytes.publicReadBytes.callAsync(combinedByteArray, testUint256Offset); + return expect(bytes).to.be.equal(wordOfData); + }); + + it('should successfully read long, nested array of bytes when it takes up the whole array', async () => { + const testBytesOffset = new BigNumber(0); + const bytes = await libBytes.publicReadBytes.callAsync(longTestBytes, testBytesOffset); + return expect(bytes).to.be.equal(longData); + }); + + it('should successfully read long, nested array of bytes when it is offset in the array', async () => { + const prefixByteArrayBuffer = ethUtil.toBuffer('0xabcdef'); + const combinedByteArrayBuffer = Buffer.concat([prefixByteArrayBuffer, longTestBytesAsBuffer]); + const combinedByteArray = ethUtil.bufferToHex(combinedByteArrayBuffer); + const testUint256Offset = new BigNumber(prefixByteArrayBuffer.byteLength); + const bytes = await libBytes.publicReadBytes.callAsync(combinedByteArray, testUint256Offset); + return expect(bytes).to.be.equal(longData); + }); + + it('should fail if the byte array is too short to hold the length of a nested byte array', async () => { + // The length of the nested array is 32 bytes. By storing less than 32 bytes, a length cannot be read. + const offset = new BigNumber(0); + return expectRevertOrOtherErrorAsync( + libBytes.publicReadBytes.callAsync(byteArrayShorterThan32Bytes, offset), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, + ); + }); + + it('should fail if we store a nested byte array length, without a nested byte array', async () => { + const offset = new BigNumber(0); + return expectRevertOrOtherErrorAsync( + libBytes.publicReadBytes.callAsync(testBytes32, offset), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED, + ); + }); + + it('should fail if the length between the offset and end of the byte array is too short to hold the length of a nested byte array', async () => { + const badOffset = new BigNumber(ethUtil.toBuffer(byteArrayShorterThan32Bytes).byteLength); + return expectRevertOrOtherErrorAsync( + libBytes.publicReadBytes.callAsync(byteArrayShorterThan32Bytes, badOffset), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, + ); + }); + + it('should fail if the length between the offset and end of the byte array is too short to hold the nested byte array', async () => { + const badOffset = new BigNumber(ethUtil.toBuffer(testBytes32).byteLength); + return expectRevertOrOtherErrorAsync( + libBytes.publicReadBytes.callAsync(testBytes32, badOffset), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_32_LENGTH_REQUIRED, + ); + }); + }); + + describe('writeBytes', () => { + it('should successfully write short, nested array of bytes when it takes up the whole array)', async () => { + const testBytesOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex(new Buffer(shortTestBytesAsBuffer.byteLength)); + const bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, testBytesOffset, shortData); + const bytesRead = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytesRead).to.be.equal(shortData); + }); + + it('should successfully write short, nested array of bytes when it is offset in the array', async () => { + // Write a prefix to the array + const prefixData = '0xabcdef'; + const prefixDataAsBuffer = ethUtil.toBuffer(prefixData); + const prefixOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex( + new Buffer(prefixDataAsBuffer.byteLength + shortTestBytesAsBuffer.byteLength), + ); + let bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, prefixOffset, prefixData); + // Write data after prefix + const testBytesOffset = new BigNumber(prefixDataAsBuffer.byteLength); + bytesWritten = await libBytes.publicWriteBytes.callAsync(bytesWritten, testBytesOffset, shortData); + // Read data after prefix and validate + const bytes = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytes).to.be.equal(shortData); + }); + + it('should successfully write a nested array of bytes - one word in length - when it takes up the whole array', async () => { + const testBytesOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex(new Buffer(wordOfTestBytesAsBuffer.byteLength)); + const bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, testBytesOffset, wordOfData); + const bytesRead = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytesRead).to.be.equal(wordOfData); + }); + + it('should successfully write a nested array of bytes - one word in length - when it is offset in the array', async () => { + // Write a prefix to the array + const prefixData = '0xabcdef'; + const prefixDataAsBuffer = ethUtil.toBuffer(prefixData); + const prefixOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex( + new Buffer(prefixDataAsBuffer.byteLength + wordOfTestBytesAsBuffer.byteLength), + ); + let bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, prefixOffset, prefixData); + // Write data after prefix + const testBytesOffset = new BigNumber(prefixDataAsBuffer.byteLength); + bytesWritten = await libBytes.publicWriteBytes.callAsync(bytesWritten, testBytesOffset, wordOfData); + // Read data after prefix and validate + const bytes = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytes).to.be.equal(wordOfData); + }); + + it('should successfully write a long, nested bytes when it takes up the whole array', async () => { + const testBytesOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex(new Buffer(longTestBytesAsBuffer.byteLength)); + const bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, testBytesOffset, longData); + const bytesRead = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytesRead).to.be.equal(longData); + }); + + it('should successfully write long, nested array of bytes when it is offset in the array', async () => { + // Write a prefix to the array + const prefixData = '0xabcdef'; + const prefixDataAsBuffer = ethUtil.toBuffer(prefixData); + const prefixOffset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex( + new Buffer(prefixDataAsBuffer.byteLength + longTestBytesAsBuffer.byteLength), + ); + let bytesWritten = await libBytes.publicWriteBytes.callAsync(emptyByteArray, prefixOffset, prefixData); + // Write data after prefix + const testBytesOffset = new BigNumber(prefixDataAsBuffer.byteLength); + bytesWritten = await libBytes.publicWriteBytes.callAsync(bytesWritten, testBytesOffset, longData); + // Read data after prefix and validate + const bytes = await libBytes.publicReadBytes.callAsync(bytesWritten, testBytesOffset); + return expect(bytes).to.be.equal(longData); + }); + + it('should fail if the byte array is too short to hold the length of a nested byte array', async () => { + const offset = new BigNumber(0); + const emptyByteArray = ethUtil.bufferToHex(new Buffer(1)); + return expectRevertOrOtherErrorAsync( + libBytes.publicWriteBytes.callAsync(emptyByteArray, offset, longData), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED, + ); + }); + + it('should fail if the length between the offset and end of the byte array is too short to hold the length of a nested byte array)', async () => { + const emptyByteArray = ethUtil.bufferToHex(new Buffer(shortTestBytesAsBuffer.byteLength)); + const badOffset = new BigNumber(ethUtil.toBuffer(shortTestBytesAsBuffer).byteLength); + return expectRevertOrOtherErrorAsync( + libBytes.publicWriteBytes.callAsync(emptyByteArray, badOffset, shortData), + constants.LIB_BYTES_GREATER_OR_EQUAL_TO_NESTED_BYTES_LENGTH_REQUIRED, + ); + }); + }); }); +// tslint:disable:max-file-line-count diff --git a/packages/contracts/test/libraries/lib_mem.ts b/packages/contracts/test/libraries/lib_mem.ts new file mode 100644 index 000000000..00f7c4d8b --- /dev/null +++ b/packages/contracts/test/libraries/lib_mem.ts @@ -0,0 +1,190 @@ +import { BigNumber } from '@0xproject/utils'; +import * as chai from 'chai'; + +import { TestLibMemContract } from '../../src/generated_contract_wrappers/test_lib_mem'; +import { artifacts } from '../../src/utils/artifacts'; +import { chaiSetup } from '../../src/utils/chai_setup'; +import { provider, txDefaults } from '../../src/utils/web3_wrapper'; + +chaiSetup.configure(); +const expect = chai.expect; + +// BUG: Ideally we would use Buffer.from(memory).toString('hex') +// https://github.com/Microsoft/TypeScript/issues/23155 +const toHex = (buf: Uint8Array): string => buf.reduce((a, v) => a + ('00' + v.toString(16)).slice(-2), '0x'); + +const fromHex = (str: string): Uint8Array => Uint8Array.from(Buffer.from(str.slice(2), 'hex')); + +describe('LibMem', () => { + let testLibMem: TestLibMemContract; + + before(async () => { + // Deploy TestLibMem + testLibMem = await TestLibMemContract.deployFrom0xArtifactAsync(artifacts.TestLibMem, provider, txDefaults); + }); + + describe('memCopy', () => { + // Create memory 0x000102...FF + const memSize = 256; + const memory = new Uint8Array(memSize).map((_, i) => i); + const memHex = toHex(memory); + + // Reference implementation to test against + const refMemcpy = (_mem: Uint8Array, dest: number, source: number, length: number): Uint8Array => + Uint8Array.from(memory).copyWithin(dest, source, source + length); + + // Test vectors: destination, source, length, job description + type Tests = Array<[number, number, number, string]>; + + const test = (tests: Tests) => + tests.forEach(([dest, source, length, job]) => + it(job, async () => { + const expected = refMemcpy(memory, dest, source, length); + const resultStr = await testLibMem.testMemcpy.callAsync( + memHex, + new BigNumber(dest), + new BigNumber(source), + new BigNumber(length), + ); + const result = fromHex(resultStr); + expect(result).to.deep.equal(expected); + }), + ); + + test([[0, 0, 0, 'copies zero bytes with overlap']]); + + describe('copies forward', () => + test([ + [128, 0, 0, 'zero bytes'], + [128, 0, 1, 'one byte'], + [128, 0, 11, 'eleven bytes'], + [128, 0, 31, 'thirty-one bytes'], + [128, 0, 32, 'one word'], + [128, 0, 64, 'two words'], + [128, 0, 96, 'three words'], + [128, 0, 33, 'one word and one byte'], + [128, 0, 72, 'two words and eight bytes'], + [128, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward within one word', () => + test([ + [16, 0, 0, 'zero bytes'], + [16, 0, 1, 'one byte'], + [16, 0, 11, 'eleven bytes'], + [16, 0, 16, 'sixteen bytes'], + ])); + + describe('copies forward with one byte overlap', () => + test([ + [0, 0, 1, 'one byte'], + [10, 0, 11, 'eleven bytes'], + [30, 0, 31, 'thirty-one bytes'], + [31, 0, 32, 'one word'], + [32, 0, 33, 'one word and one byte'], + [71, 0, 72, 'two words and eight bytes'], + [99, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward with thirty-one bytes overlap', () => + test([ + [0, 0, 31, 'thirty-one bytes'], + [1, 0, 32, 'one word'], + [2, 0, 33, 'one word and one byte'], + [41, 0, 72, 'two words and eight bytes'], + [69, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward with one word overlap', () => + test([ + [0, 0, 32, 'one word'], + [1, 0, 33, 'one word and one byte'], + [41, 0, 72, 'two words and eight bytes'], + [69, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward with one word and one byte overlap', () => + test([ + [0, 0, 33, 'one word and one byte'], + [40, 0, 72, 'two words and eight bytes'], + [68, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward with two words overlap', () => + test([ + [0, 0, 64, 'two words'], + [8, 0, 72, 'two words and eight bytes'], + [36, 0, 100, 'three words and four bytes'], + ])); + + describe('copies forward within one word and one byte overlap', () => + test([[0, 0, 1, 'one byte'], [10, 0, 11, 'eleven bytes'], [15, 0, 16, 'sixteen bytes']])); + + describe('copies backward', () => + test([ + [0, 128, 0, 'zero bytes'], + [0, 128, 1, 'one byte'], + [0, 128, 11, 'eleven bytes'], + [0, 128, 31, 'thirty-one bytes'], + [0, 128, 32, 'one word'], + [0, 128, 64, 'two words'], + [0, 128, 96, 'three words'], + [0, 128, 33, 'one word and one byte'], + [0, 128, 72, 'two words and eight bytes'], + [0, 128, 100, 'three words and four bytes'], + ])); + + describe('copies backward within one word', () => + test([ + [0, 16, 0, 'zero bytes'], + [0, 16, 1, 'one byte'], + [0, 16, 11, 'eleven bytes'], + [0, 16, 16, 'sixteen bytes'], + ])); + + describe('copies backward with one byte overlap', () => + test([ + [0, 0, 1, 'one byte'], + [0, 10, 11, 'eleven bytes'], + [0, 30, 31, 'thirty-one bytes'], + [0, 31, 32, 'one word'], + [0, 32, 33, 'one word and one byte'], + [0, 71, 72, 'two words and eight bytes'], + [0, 99, 100, 'three words and four bytes'], + ])); + + describe('copies backward with thirty-one bytes overlap', () => + test([ + [0, 0, 31, 'thirty-one bytes'], + [0, 1, 32, 'one word'], + [0, 2, 33, 'one word and one byte'], + [0, 41, 72, 'two words and eight bytes'], + [0, 69, 100, 'three words and four bytes'], + ])); + + describe('copies backward with one word overlap', () => + test([ + [0, 0, 32, 'one word'], + [0, 1, 33, 'one word and one byte'], + [0, 41, 72, 'two words and eight bytes'], + [0, 69, 100, 'three words and four bytes'], + ])); + + describe('copies backward with one word and one byte overlap', () => + test([ + [0, 0, 33, 'one word and one byte'], + [0, 40, 72, 'two words and eight bytes'], + [0, 68, 100, 'three words and four bytes'], + ])); + + describe('copies backward with two words overlap', () => + test([ + [0, 0, 64, 'two words'], + [0, 8, 72, 'two words and eight bytes'], + [0, 36, 100, 'three words and four bytes'], + ])); + + describe('copies forward within one word and one byte overlap', () => + test([[0, 0, 1, 'one byte'], [0, 10, 11, 'eleven bytes'], [0, 15, 16, 'sixteen bytes']])); + }); +}); |