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assert: print more lines in the error diff
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So far consequitive identical lines were collapsed if there were at
least three. Now they are only collapsed from five identical lines on.

This also simplifies the implementation a tiny bit by abstracting some
logic.

PR-URL: nodejs#28058
Reviewed-By: Rich Trott <rtrott@gmail.com>
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@BridgeAR @Trott
BridgeAR authored and Trott committed Jun 13, 2019
1 parent e4ec4f2 commit 8149656
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Showing 4 changed files with 77 additions and 57 deletions.
84 changes: 46 additions & 38 deletions lib/internal/assert/assertion_error.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -122,7 +122,7 @@ function createErrDiff(actual, expected, operator) {
let a = actualLines[actualLines.length - 1];
let b = expectedLines[expectedLines.length - 1];
while (a === b) {
if (i++ < 2) {
if (i++ < 3) {
end = `\n ${a}${end}`;
} else {
other = a;
Expand Down Expand Up @@ -154,7 +154,9 @@ function createErrDiff(actual, expected, operator) {
return `${kReadableOperator.notIdentical}\n\n${actualLines.join('\n')}\n`;
}

if (i > 3) {
// There were at least five identical lines at the end. Mark a couple of
// skipped.
if (i >= 5) {
end = `\n${blue}...${white}${end}`;
skipped = true;
}
Expand All @@ -169,46 +171,46 @@ function createErrDiff(actual, expected, operator) {
`\n${green}+ actual${white} ${red}- expected${white}`;
const skippedMsg = ` ${blue}...${white} Lines skipped`;

let lines = actualLines;
let plusMinus = `${green}+${white}`;
let maxLength = expectedLines.length;
if (actualLines.length < maxLines) {
lines = expectedLines;
plusMinus = `${red}-${white}`;
maxLength = actualLines.length;
}

for (i = 0; i < maxLines; i++) {
if (actualLines.length < i + 1) {
// If more than one former line is identical, print that. Collapse those
// in case more than three lines before were identical.
if (identical > 1) {
if (maxLength < i + 1) {
// If more than two former lines are identical, print them. Collapse them
// in case more than five lines were identical.
if (identical > 2) {
if (identical > 3) {
res += `\n${blue}...${white}`;
skipped = true;
} else if (identical > 2) {
res += `\n ${expectedLines[i - 2]}`;
if (identical > 4) {
if (identical === 5) {
res += `\n ${lines[i - 3]}`;
printedLines++;
} else {
res += `\n${blue}...${white}`;
skipped = true;
}
}
res += `\n ${lines[i - 2]}`;
printedLines++;
}
res += `\n ${expectedLines[i - 1]}`;
res += `\n ${lines[i - 1]}`;
printedLines++;
}
// No identical lines before.
identical = 0;
// Add the expected line to the cache.
other += `\n${red}-${white} ${expectedLines[i]}`;
printedLines++;
// Only extra actual lines exist
} else if (expectedLines.length < i + 1) {
// If more than one former line is identical, print that. Collapse those
// in case more than three lines before were identical.
if (identical > 1) {
if (identical > 3) {
res += `\n${blue}...${white}`;
skipped = true;
} else if (identical > 2) {
res += `\n ${actualLines[i - 2]}`;
printedLines++;
}
res += `\n ${actualLines[i - 1]}`;
printedLines++;
if (lines === actualLines) {
res += `\n${plusMinus} ${lines[i]}`;
} else {
other += `\n${plusMinus} ${lines[i]}`;
}
// No identical lines before.
identical = 0;
// Add the actual line to the result.
res += `\n${green}+${white} ${actualLines[i]}`;
printedLines++;
// Only extra actual lines exist
// Lines diverge
} else {
const expectedLine = expectedLines[i];
Expand All @@ -235,13 +237,19 @@ function createErrDiff(actual, expected, operator) {
actualLine += ',';
}
if (divergingLines) {
// If more than one former line is identical, print that. Collapse those
// in case more than three lines before were identical.
if (identical > 1) {
// If more than two former lines are identical, print them. Collapse
// them in case more than five lines were identical.
if (identical > 2) {
if (identical > 3) {
res += `\n${blue}...${white}`;
skipped = true;
} else if (identical > 2) {
if (identical > 4) {
if (identical === 5) {
res += `\n ${actualLines[i - 3]}`;
printedLines++;
} else {
res += `\n${blue}...${white}`;
skipped = true;
}
}
res += `\n ${actualLines[i - 2]}`;
printedLines++;
}
Expand All @@ -264,7 +272,7 @@ function createErrDiff(actual, expected, operator) {
identical++;
// The very first identical line since the last diverging line is be
// added to the result.
if (identical === 1) {
if (identical <= 2) {
res += `\n ${actualLine}`;
printedLines++;
}
Expand Down
38 changes: 22 additions & 16 deletions test/parallel/test-assert-deep.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,7 @@ assert.throws(
code: 'ERR_ASSERTION',
message: `${defaultMsgStartFull} ... Lines skipped\n\n` +
'+ Uint8Array [\n' +
'- Buffer [Uint8Array] [\n 120,\n...\n 10\n ]'
'- Buffer [Uint8Array] [\n 120,\n...\n 122,\n 10\n ]'
}
);
assert.deepEqual(arr, buf);
Expand All @@ -66,9 +66,11 @@ assert.deepEqual(arr, buf);
() => assert.deepStrictEqual(buf2, buf),
{
code: 'ERR_ASSERTION',
message: `${defaultMsgStartFull} ... Lines skipped\n\n` +
message: `${defaultMsgStartFull}\n\n` +
' Buffer [Uint8Array] [\n' +
'...\n' +
' 120,\n' +
' 121,\n' +
' 122,\n' +
' 10,\n' +
'+ prop: 1\n' +
' ]'
Expand All @@ -84,9 +86,11 @@ assert.deepEqual(arr, buf);
() => assert.deepStrictEqual(arr, arr2),
{
code: 'ERR_ASSERTION',
message: `${defaultMsgStartFull} ... Lines skipped\n\n` +
message: `${defaultMsgStartFull}\n\n` +
' Uint8Array [\n' +
'...\n' +
' 120,\n' +
' 121,\n' +
' 122,\n' +
' 10,\n' +
'- prop: 5\n' +
' ]'
Expand Down Expand Up @@ -932,17 +936,19 @@ assert.deepStrictEqual(obj1, obj2);
),
{
message: 'Expected values to be strictly deep-equal:\n' +
'+ actual - expected ... Lines skipped\n' +
'\n' +
' Comparison {\n' +
'...\n' +
" \"+ foo: 'bar'\\n\" +\n" +
"+ \"- foo: 'baz.'\\n\" +\n" +
"- \"- foo: 'baz'\\n\" +\n" +
" ' }',\n" +
"+ operator: 'deepStrictEqual'\n" +
"- operator: 'throws'\n" +
' }'
'+ actual - expected ... Lines skipped\n' +
'\n' +
' Comparison {\n' +
" message: 'Expected values to be strictly deep-equal:\\n' +\n" +
'...\n' +
" ' [TypeError: foo] {\\n' +\n" +
" \"+ foo: 'bar'\\n\" +\n" +
"+ \"- foo: 'baz.'\\n\" +\n" +
"- \"- foo: 'baz'\\n\" +\n" +
" ' }',\n" +
"+ operator: 'deepStrictEqual'\n" +
"- operator: 'throws'\n" +
' }'
}
);
}
Expand Down
9 changes: 7 additions & 2 deletions test/parallel/test-assert.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -482,12 +482,14 @@ assert.throws(
'',
' [',
' [',
'...',
' [',
' 1,',
' 2,',
'+ 3',
"- '3'",
' ]',
'...',
' 4,',
' 5',
' ]'].join('\n');
assert.throws(
Expand All @@ -501,10 +503,12 @@ assert.throws(
' [',
' 1,',
'...',
' 1,',
' 0,',
'- 1,',
' 1,',
'...',
' 1,',
' 1',
' ]'
].join('\n');
Expand All @@ -521,10 +525,11 @@ assert.throws(
' [',
' 1,',
'...',
' 1,',
' 0,',
'+ 1,',
' 1,',
'...',
' 1,',
' 1',
' ]'
].join('\n');
Expand Down
3 changes: 2 additions & 1 deletion test/pseudo-tty/test-assert-colors.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ try {
// active.
process.env.TERM = 'FOOBAR';
delete process.env.NODE_DISABLE_COLORS;
assert.deepStrictEqual([1, 2, 2, 2], [2, 2, 2, 2]);
assert.deepStrictEqual([1, 2, 2, 2, 2], [2, 2, 2, 2, 2]);
} catch (err) {
const expected = 'Expected values to be strictly deep-equal:\n' +
'\u001b[32m+ actual\u001b[39m \u001b[31m- expected\u001b[39m' +
Expand All @@ -19,6 +19,7 @@ try {
'\u001b[31m-\u001b[39m 2,\n' +
' 2,\n' +
'\u001b[34m...\u001b[39m\n' +
' 2,\n' +
' 2\n' +
' ]';
assert.strictEqual(err.message, expected);
Expand Down

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