![]() ![]() Prints error message and stack trace to stderr: // Error: Whoops, something bad happened // at :5:15 // at nInThisContext (node:vm:132:18) // at nInThisContext (node:vm:309:38) // at node:internal/process/execution:77:19 // at -wrapper:6:22 // at evalScript (node:internal/process/execution:76:60) // at node:internal/main/eval_string:23:3 const name = 'Will Robinson' Ĭonsole. error( new Error( 'Whoops, something bad happened')) Prints: hello world, to stdout console. Syntax assert. To compare the values using the stricter operator, use the assert.notStrictEqual () method. In assert () function, if the value is not truth, then a AssertionError is thrown with a message property set equal to the value of the message parameter. If the two values are equal, an assertion failure is being caused, and the program is terminated. The assert module provides a set of assertion functions for verifying invariants. Prints: hello world, to stdout console. The assert.notEqual () method tests if two values are NOT equal, using the operator. It should be noted that while the function is called ok (), that does not mean that it is expecting a true value from your code. This appears to simply be a convenience function. See the note on process I/O forĮxample using the global console: console. ok (value, message) is equivalent to assert.equal (value, true, message). Synchronous like the browser APIs they resemble, nor are they consistentlyĪsynchronous like all other Node.js streams. Warning: The global console object's methods are neither consistently The global console can be used without calling A global console instance configured to write to process.stdout and.A Console class with methods such as console.log(), console.error(), andĬonsole.warn() that can be used to write to any Node.js stream.The module exports two specific components: ![]() The JavaScript console mechanism provided by web browsers. Then we are calling the tracker.report() function.Ĭonst tracker = new assert.CallTracker() Ĭonst callsfunc = tracker.The node:console module provides a simple debugging console that is similar to Then we are passing the function func as a parameter to the tracker.calls() function we wrapped the function func to the wrapper function funccall. Operator − This will let us know the name of the function that is wrapped by the wrapper function. Message − The message will be assigned by the function automatically.Īctual − This shows the actual number of times the function was called.Įxpected − This shows the number of times the function was expected to call. ![]() The information object holding is described below − The function tracker.report() returns an array of objects holding information about the wrapper function returned by tracker.calls() function. This function doesn’t accept any parameters. Syntaxįollowing is the example of the Node.js tracker.report() function − This function returns an array of objects which contains all the information about the wrapper function returned by the tracker.calls() function. The Node.js tracker.report() function is helpful when we want to know the information about the expected and actual number of calls of the functions that have not been called the expected number of times. The tracker.report() function is an inbuilt function of the assert module of Node.js. The assert module provides a set of assertion functions for verifying invariants. ![]()
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