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chai.javascript.txt
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chai.javascript.txt
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CHAI
ALTERNATIVES ==> #Prefer using assertions built-in the test runner if available
#Otherwise:
# - Node.js core ASSERT module (prefer if wants minimalistic)
# - Deno (prefer with Deno)
# - chai (prefer if wants expressive)
# - should.js:
# - lots of features
# - very similar to chai:
# - a bit less known
# - a little easier to add extensions
# - use less flags (i.e. get property descriptors) and does not change the
# current value in the chain, which can be confusing
# - power-assert:
# - uses Node.js ASSERT standard API
# - parses JavaScript AST (with Esprima) to give detailed error message including
# assert() argument values
# - requires additional instrumentation because of this parsing
# - not too maintained
# - must.js: not maintained
# - unexpected: lots of features but less known
# - jasmine assertions:
# - integrated with jasmine
# - more verbose and a little less features
# - jasmine-matchers: Jasmine-specific
# - jasmine-utils: Jasmine-specific
# - expect-more:
# - Jasmine|Jest-specific
# - curried
# - not maintained
# - jest assertions:
# - integrated with jest
# - more verbose and a little less features
# - snapshots testing
# - jest-extended:
# - Jest-specific
# - many more assertions, similar to chai or should.js
# - not well maintained
# - ava assertions:
# - Ava-specific
# - minimalistic, close to Node.js core ASSERT module
# - do not throw on failure
# - tape assertions:
# - Tape-specific
# - minimalistic, close to Node.js core ASSERT module
# - do not throw on failure
# - tape assertions:
# - Node-tap-specific
# - minimalistic, close to Node.js core ASSERT module
# - do not throw on failure
# - tape-modern assertions:
# - Node-tap-specific
# - very minimalistic, close to Node.js core ASSERT module
# - do not throw on failure
VERSION ==> #5.0.0
#Node.js or browser
MOCHA ==> #Usually used by Mocha, but does not have to
/=+===============================+=\
/ : : \
)==: BASE :==(
\ :_______________________________: /
\=+===============================+=/
VAL.should #SHOULD
#CHAI.should() must first be fired to extend OBJ prototype with OBJ.should
#VAL cannot be null|undefined
CHAI.expect(VAL) #SHOULD
new CHAI.Assertion(VAL) #SHOULD
CHAI.assert(VAL) #SHOULD
#Uses another naming conventions for the assertions (not documented here)
SHOULD #Object wrapping VAL, which is accessed with SHOULD._obj
SHOULD CHAIN ==> #All members returns SHOULD, so can be chained, e.g. VAL.should.exist.and.be.ok
#There are two types of members along the chains:
# - methods: assertion on SHOULD._obj, internally using SHOULD.assert()
# - properties: add an internal "flag" along the chain, that will influence next methods
CONFIG VAR ==> #Can be used by Mocha reporters
CHAI.config.includeStack #Show stack trace (def: false)
CHAI.config.showDiff #Show diff (def: true)
CHAI.config.truncateThreshold #Truncates VAL length (def: 40, 0 to disable)
/=+===============================+=\
/ : : \
)==: GENERIC :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD.be #
SHOULD.have[.been] #
SHOULD...that|which
[.is|has[.been]|does] #
SHOULD...and|but #
SHOULD.with|at|of|same|to|still #Same as SHOULD (doesn't do anything), provided only for BDD-style syntax
SHOULD.not #Negation
SHOULD.satisfy[ies]
(FUNC(VAL)->BOOL) #
SHOULD.equal(VAL) #===. Compare OBJ by reference.
SHOULD.deep.equal(VAL) #===. Compare OBJ by copy (including inherited) (using Object.is())
SHOULD.eql(VAL) #Like deep.equal() except "deep" flag is not set
SHOULD.be.oneOf(ARR) #=== one of ARR values
SHOULD.[be.a[n]](STR) #Uses type-detect (see its doc)
SHOULD.[be.an.]instanceof(FUNC) #VAL instanceof TYPE
SHOULD.[be.]arguments #Is arguments object
/=+===============================+=\
/ : : \
)==: NULL|UNDEFINED :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD.[be.]null|undefined #=== null|undefined
SHOULD.exist #!== null|undefined
CHAI.should().[not.]exist(VAL) #When using VAL.should
/=+===============================+=\
/ : : \
)==: BOOLEAN :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD.[be.]true|false #=== true|false
SHOULD.[be.]ok #== true|false
/=+===============================+=\
/ : : \
)==: NUMBER :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD.[be.]NaN #Object.is(NaN)
SHOULD.[be.]finite #Number.isFinite()
SHOULD.[be.]above|[at.]least|
below|[at.]most(NUM) #> >= < <=
SHOULD.[be.]within(NUM, NUM2) #> and <
SHOULD.[be.]closeTo|approximately
(NUM, NUM2) #>= NUM-NUM2 and <= NUM+NUM2
/=+===============================+=\
/ : : \
)==: STRING :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD_STR.match[es](REGEXP) #REGEXP.test()
SHOULD_STR.
include[s]|contain[s](STR2)
SHOULD_STR.[have.]string(STR2) #STR2 is inside STR
SHOULD_STR.[have.]lengthOf
[.above|below|least|most|within]
(NUM) #STR.length === > < >= <= NUM
SHOULD_STR.[be.]empty #STR.length === 0
/=+===============================+=\
/ : : \
)==: ARRAY|OBJECT :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD_ARR|SET|MAP.
[deep.]include[s]|contain[s](VAL)#One value [deep.]equal(VAL)
SHOULD_ARR|SET|MAP.
[deep.]include[s]|contain[s]
.oneOf(ARR) #One value [deep.]equal(one of ARR)
SHOULD_ARR.
[have|include[s]|contain[s].] #ARR2 have exact same values (or is subset if "include") as ARR (using [deep.]equal())
[deep.][ordered.]members(ARR2) #Unless "ordered", can be in different order
SHOULD_OBJ.[deep.][own|nested.] #OBJ2 [deep] subset of OBJ
include[s]|contain[s](OBJ2) #If "own", non-inherited only.
#If "nested", OBJ2 keys can be a dot|bracket-delimited VARR
SHOULD_OBJ|ARR.[have.][deep.] #Check property exists.
[own|nested.]property #"own|nested": like include()
('PROP'[,VAL])[.that[.is]|with...]#If VAL, also checks property [deep.]equal(VAL)
#The assertion value from OBJ to OBJ.PROP for the rest of the chain, e.g.:
# SHOULD_OBJ.have.property(...).that.is.true.with.property(...).that.is.false
SHOULD_OBJ|ARR.[have.]
ownPropertyDescriptor
('PROP'[, VAL])][...] #Same except VAL (and the new assertion value) is the object descriptor
SHLD_OBJ|ARR|MAP|SET.
have|contain.any.[deep.]key[s]
('PROP'[_ARR]...) #At least one property should exist
SHOULD_OBJ|ARR|MAP|SET.
include|contain.all.[deep.]key[s]
('PROP'[_ARR]...) #All properties should exist
SHOULD_OBJ|ARR|MAP|SET.
have.[all.][deep.]key[s]
('PROP'[_ARR]...) #All properties should exist, and no other properties should exist
SHOULD_OBJ.[itself.]respondTo #Check property exists and it is a function.
('FUNC') #Not through prototype if "itself"
SHOULD_OBJ|ARR|MAP|SET
.[have.]lengthOf
[.above|below|least|most|within]
(NUM) #OBJ|ARR|MAP|SET.length === > < >= <= NUM
SHOULD_OBJ|ARR|MAP|SET.[be.]empty #OBJ|ARR|MAP|SET.length === 0
SHOULD_OBJ.be.
extensible|sealed|frozen #Check Object.isExtensible|Sealed|Frozen()
/=+===============================+=\
/ : : \
)==: FUNCTION :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD_FUNC.throw[s] #Should throw.
([ERROR|ErrorType], [REGEXP|STR])#The assertion value becomes ERROR for rest of the chain.
SHOULD_FUNC.change[s](FUNC2)
SHOULD_FUNC.change[s](OBJ, 'PROP')#FUNC() return value or OBJ.PROP should be different before|after FUNC() called
SHOULD_FUNC.
increase[s]|decrease[s](...)
[by.(NUM)] #Same but for increment|decrement
/=+===============================+=\
/ : : \
)==: DATE :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD_DATE.equal|before| ##With "Date": same but truncates after day.
afterTime|Date(DATE2) ##Module chai-datetime 1.4.0
SHOULD_DATE.withinTime|Date
(DATE2, DATE3) ##
/=+===============================+=\
/ : : \
)==: PROMISE :==(
\ :_______________________________: /
\=+===============================+=/
CHAI-AS-PROMISED ==> ##Module chai-as-promised (7.1.1)
CHAIPROMISE ##PROMISE with only then(FUNC, FUNC2) member returned by every methods below.
##To extend it:
## - use CHAIASPROMISED.transferPromiseness = FUNC(SHOULD, PROMISE)
## - where FUNC() assigns SHOULD.then|catch|finally = PROMISE.FUNC.bind(PROMISE)
CHAIPROMISE.notify(FUNC) ##Calls FUNC([ERROR]) when CHAIPROMISE is resolved|rejected
CHAIASPROMSD.transformAsserterArgs##Maps arguments passed to assertion functions when "eventually" or "rejectedWith" is used
= FUNC(ARR)->[PROMISE_]ARR ##Example use: allow doing SHOULD_PROMISE.become(PROMISE_VAL)
async|await ##Every CHAIPROMISE returned needs to be handled either by:
## - returning it in it()
## - using await
##Also simply using async|await is better than using fulfilled|eventually|become(),
##but rejected[With] are still useful.
SHOULD_PROMISE.[be.]fulfilled ##PROMISE should be resolved.
SHOULD_PROMISE. ##PROMISE should be resolved and resolve with VAL and VAL.should.FUNC2(...).
eventually.FUNC2(...) ##Prefer async|await
SHOULD_PROMISE.become(VAL) ##Same as SHOULD_PROMISE.eventually.deep.equal(VAL)
SHOULD_PROMISE.[be.]rejected
SHOULD_PROMISE.
[be.]rejectedWith(VAL) ##PROMISE should be rejected [with VAL]
/=+===============================+=\
/ : : \
)==: EXTENSIONS :==(
\ :_______________________________: /
\=+===============================+=/
SHOULD.assert(BOOL, STR[()], #Throws AssertionError('MESSAGE') if BOOL false. Noop if BOOL true.
STR2[()][, VAL][, VAL2]) #Used internally by all assertion methods.
#STR[2]:
# - positive|negative error message
# - usually "expected ... to VERB ..."
# - can include following template patterns:
# - "#{this}": SHOULD._obj
# - "#{exp}": VAL (expected value)
# - "#{act}": VAL2 (def: SHOULD._obj) (actual value)
#"Internal error message":
# - STR3 prepended to error message (def: "")
# - specified as optional last argument to all assertion method, or to new CHAI.Assertion(VAL, STR)
# - usually specific to the calling code, not to the generic assertion problem
CHAIUTILS.flag #Gets|sets a "flag"
(SHOULD, 'VAR'[, 'VAL']) #Some flags used by most assertions:
# - "object": underlying VAL. Can also use SHOULD._obj
# - "message": "internal error message"
# - "negate" BOOL: flag .not
# - "deep" BOOL: flag .deep
# - "contains" BOOL: flag .include.*
# - "length" BOOL: flag .length.*
#When creating a new flag, should either create properties|methods handling it,
#or overwrite current ones.
CHAIUTILS.transferFlags #Copy this's flags to SHOULD, except "object" and "message" (unless BOOL is true)
(this, SHOULD[, BOOL]) #To use on final assertions inside a custom property|method, that create a SHOULD,
#to make sure flags are propagated.
#Not to use:
# - when checking preconditions
# - on final assertions with SHOULD.assert() (not affected by flags)
CHAI.use(FUNC(CHAI, CHAIUTILS)) #Fires FUNC().
#FUNC are usually plugins MODULE which fire CHAI.Assertion.*
CHAI.Assertion.addProperty #Makes SHOULD.PROP firing FUNC2() with SHOULD as this.
('PROP', FUNC2()) #Usually meant to:
# - assert preconditions with this.*
# - use CHAIUTILS.flag()
CHAI.Assertion.addMethod #Same for SHOULD.FUNC(...).
('FUNC', FUNC2(...)) #Usually FUNC2() includes actual assertions (as opposed to preconditions) with this.assert()
CHAI.Assertion.addChainableMethod #Same as CHAI.Assertion.addMethod(STR, FUNC); CHAI.Assertion.addProperty(STR, FUNC2), except:
(STR, FUNC, FUNC2) # - it cannot be overwritten (case of a, an, include, length)
# - method FUNC() also fire property FUNC2()
CHAI.Assertion.overwriteMethod #Overwrite SHOULD.FUNC(...)
('FUNC', FUNC3(SUPER)->FUNC2(...))#If SHOULD.FUNC() is overwritten only for specific preconditions (e.g. if input is HTML),
#can call original method with SUPER.call(this, ...)
CHAI.Assertion.overwriteProperty
('PROP', FUNC3(SUPER)->FUNC2()) #Same for SHOULD.PROP
CHAI.Assertion.
overwriteChainableMethod
(STR, FUNC3, FUNC4) #