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85 lines
2.1 KiB
Markdown
85 lines
2.1 KiB
Markdown
# Assert
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Stability: 5 - Locked
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This module is used for writing unit tests for your applications, you can
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access it with `require('assert')`.
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## assert.fail(actual, expected, message, operator)
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Throws an exception that displays the values for `actual` and `expected` separated by the provided operator.
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## assert(value, message), assert.ok(value, [message])
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Tests if value is truthy, it is equivalent to `assert.equal(true, !!value, message);`
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## assert.equal(actual, expected, [message])
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Tests shallow, coercive equality with the equal comparison operator ( `==` ).
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## assert.notEqual(actual, expected, [message])
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Tests shallow, coercive non-equality with the not equal comparison operator ( `!=` ).
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## assert.deepEqual(actual, expected, [message])
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Tests for deep equality.
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## assert.notDeepEqual(actual, expected, [message])
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Tests for any deep inequality.
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## assert.strictEqual(actual, expected, [message])
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Tests strict equality, as determined by the strict equality operator ( `===` )
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## assert.notStrictEqual(actual, expected, [message])
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Tests strict non-equality, as determined by the strict not equal operator ( `!==` )
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## assert.throws(block, [error], [message])
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Expects `block` to throw an error. `error` can be constructor, regexp or
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validation function.
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Validate instanceof using constructor:
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assert.throws(
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function() {
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throw new Error("Wrong value");
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},
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Error
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);
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Validate error message using RegExp:
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assert.throws(
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function() {
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throw new Error("Wrong value");
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},
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/value/
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);
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Custom error validation:
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assert.throws(
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function() {
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throw new Error("Wrong value");
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},
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function(err) {
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if ( (err instanceof Error) && /value/.test(err) ) {
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return true;
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}
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},
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"unexpected error"
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);
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## assert.doesNotThrow(block, [error], [message])
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Expects `block` not to throw an error, see assert.throws for details.
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## assert.ifError(value)
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Tests if value is not a false value, throws if it is a true value. Useful when
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testing the first argument, `error` in callbacks.
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