assert: validate required arguments

This validates most `assert` functions to verify that the required
arguments are indeed passed to the function.

.eslintrc.js

@@ -210,22 +210,6 @@ module.exports = {
         selector: 'ThrowStatement > CallExpression[callee.name=/Error$/]',
         message: 'Use `new` keyword when throwing an `Error`.',
       },
-      {
-        selector: "CallExpression[callee.property.name='notDeepStrictEqual'][arguments.length<2]",
-        message: 'assert.notDeepStrictEqual() must be invoked with at least two arguments.',
-      },
-      {
-        selector: "CallExpression[callee.property.name='deepStrictEqual'][arguments.length<2]",
-        message: 'assert.deepStrictEqual() must be invoked with at least two arguments.',
-      },
-      {
-        selector: "CallExpression[callee.property.name='notStrictEqual'][arguments.length<2]",
-        message: 'assert.notStrictEqual() must be invoked with at least two arguments.',
-      },
-      {
-        selector: "CallExpression[callee.property.name='strictEqual'][arguments.length<2]",
-        message: 'assert.strictEqual() must be invoked with at least two arguments.',
-      },
       {
         selector: "CallExpression[callee.property.name='notDeepStrictEqual'][arguments.0.type='Literal']:not([arguments.1.type='Literal']):not([arguments.1.type='ObjectExpression']):not([arguments.1.type='ArrayExpression']):not([arguments.1.type='UnaryExpression'])",
         message: 'The first argument should be the `actual`, not the `expected` value.',

lib/assert.js

@@ -25,7 +25,8 @@ const { codes: {
   ERR_AMBIGUOUS_ARGUMENT,
   ERR_INVALID_ARG_TYPE,
   ERR_INVALID_ARG_VALUE,
-  ERR_INVALID_RETURN_VALUE
+  ERR_INVALID_RETURN_VALUE,
+  ERR_MISSING_ARGS
 } } = require('internal/errors');
 const AssertionError = require('internal/assert/assertion_error');
 const { openSync, closeSync, readSync } = require('fs');
@@ -351,6 +352,9 @@ assert.ok = ok;
 // The equality assertion tests shallow, coercive equality with ==.
 /* eslint-disable no-restricted-properties */
 assert.equal = function equal(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   // eslint-disable-next-line eqeqeq
   if (actual != expected) {
     innerFail({
@@ -366,6 +370,9 @@ assert.equal = function equal(actual, expected, message) {
 // The non-equality assertion tests for whether two objects are not
 // equal with !=.
 assert.notEqual = function notEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   // eslint-disable-next-line eqeqeq
   if (actual == expected) {
     innerFail({
@@ -380,6 +387,9 @@ assert.notEqual = function notEqual(actual, expected, message) {
 
 // The equivalence assertion tests a deep equality relation.
 assert.deepEqual = function deepEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (isDeepEqual === undefined) lazyLoadComparison();
   if (!isDeepEqual(actual, expected)) {
     innerFail({
@@ -394,6 +404,9 @@ assert.deepEqual = function deepEqual(actual, expected, message) {
 
 // The non-equivalence assertion tests for any deep inequality.
 assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (isDeepEqual === undefined) lazyLoadComparison();
   if (isDeepEqual(actual, expected)) {
     innerFail({
@@ -408,6 +421,9 @@ assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
 /* eslint-enable */
 
 assert.deepStrictEqual = function deepStrictEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (isDeepEqual === undefined) lazyLoadComparison();
   if (!isDeepStrictEqual(actual, expected)) {
     innerFail({
@@ -422,6 +438,9 @@ assert.deepStrictEqual = function deepStrictEqual(actual, expected, message) {
 
 assert.notDeepStrictEqual = notDeepStrictEqual;
 function notDeepStrictEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (isDeepEqual === undefined) lazyLoadComparison();
   if (isDeepStrictEqual(actual, expected)) {
     innerFail({
@@ -435,6 +454,9 @@ function notDeepStrictEqual(actual, expected, message) {
 }
 
 assert.strictEqual = function strictEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (!Object.is(actual, expected)) {
     innerFail({
       actual,
@@ -447,6 +469,9 @@ assert.strictEqual = function strictEqual(actual, expected, message) {
 };
 
 assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
+  if (arguments.length < 2) {
+    throw new ERR_MISSING_ARGS('actual', 'expected');
+  }
   if (Object.is(actual, expected)) {
     innerFail({
       actual,

test/parallel/test-assert.js

@@ -560,7 +560,7 @@ assert.throws(
     '- undefined',
   ].join('\n');
   assert.throws(
-    () => assert.deepEqual([1, 2, 1]),
+    () => assert.deepEqual([1, 2, 1], undefined),
     { message });
 
   message = [
@@ -1147,3 +1147,43 @@ assert.throws(
   }
   assert(threw);
 }
+
+assert.throws(
+  () => a.equal(1),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.deepEqual(/a/),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.notEqual(null),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.notDeepEqual('test'),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.strictEqual({}),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.deepStrictEqual(Symbol()),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.notStrictEqual(5n),
+  { code: 'ERR_MISSING_ARGS' }
+);
+
+assert.throws(
+  () => a.notDeepStrictEqual(undefined),
+  { code: 'ERR_MISSING_ARGS' }
+);