Nodejs Learning Note--assert (assertion)

Assert-a:actual e:expected m:message o:operator v:value b:block

Assert.fail (A, E, M, O)

assert (V, m), Assert.ok (V, [m])

Assert.equal (A, E, [m])

Assert.notequal (A, E, [m])

Assert.deepequal (A, E, [m])

Assert.notdeepequal (A, E, [m])

Assert.strictequal (A, E, [m])

Assert.notstrictequal (A, E, [m])

Assert.throws (b, [ERROR], [m])

Assert.doesnotthrow (b, [m])

Assert.iferror (v)

Assert.fail (A, E, M, O)

Throws An exception This displays the values for and separated by the actual expected provided operator.

Note:always throws an exception and display the message which would be "actual operator expected" if it's omited.

e.g and assert.fail(1,1,"Always throws this message","=")assert.fail(1,1,"","+")

Assert (V, [M]), Assert.ok (V, [m])

Tests if value is truthy, it's equivalent toassert.equal(true, !!value, message);

Note:if the value isn ' t a truth-value, it throws and exception and display the message which would be "value = = true" If I T ' s omited.

e.g and assert(0)assert.ok(0,"Throws me")

Assert.equal (A, E, [m])

Tests shallow, coercive equality with the equal comparison operator ( == ).

e.g and assert.equal(1,2,"They are not equal")assert.equal(1,1,"would not show me")

Assert.notequal (A, E, [m])

Tests shallow, coercive non-equality with the not equal comparison operator ( != ).

Note: In summary, an exception is thrown when the comparison result is false.

Assert.deepequal (A, E, [m])

Tests for deep equality.

Note: not clear!

Assert.notdeepequal (A, E, [m])

Tests for any deep inequality.

Note: not clear!

Assert.strictequal (A, E, [m])

Tests strict equality, as determined by the strict equality operator ( === )

Assert.notstrictequal (A, E, [m])

Tests strict non-equality, as determined by the strict not equal operator ( !== )

Assert.throws (b, [ERROR], [m])

expects block to throw a error. error can be constructor, RegExp or validation function.

Validate instanceof Using constructor:

Assert.throws (function () {throw new Error ("wrong value");},error);

Validate error message using REGEXP:

Assert.throws (function () {throw new Error ("wrong value");},/value/);

Custom Error Validation:

Assert.throws (function () {throw new Error ("Wrong value"),},function (err) {if (err instanceof Error) &&/value/. Test (Err)) {return true;}, "Unexpected error");

Assert.doesnotthrow (b, [M])

expects not block to throw a error, see for assert.throws details.

Assert.iferror (v)

Tests if value is no a false value, throws if it is a true value. Useful when testing the first argument, in error callbacks.

Note:it throws error when the value is a truth-value!

Nodejs Learning Note--assert (assertion)