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'use strict'
import
sinon
from
'sinon'
import
engineFactory
,
{
Fact
,
Rule
,
Operator
}
from
'../src/index'
import
defaultOperators
from
'../src/engine-default-operators'
describe
(
'Engine'
,
(
)
=>
{
let
engine
let
sandbox
before
(
(
)
=>
{
sandbox
=
sinon
.
createSandbox
(
)
}
)
afterEach
(
(
)
=>
{
sandbox
.
restore
(
)
}
)
beforeEach
(
(
)
=>
{
engine
=
engineFactory
(
)
}
)
it
(
'has methods for managing facts and rules, and running itself'
,
(
)
=>
{
expect
(
engine
)
.
to
.
have
.
property
(
'addRule'
)
expect
(
engine
)
.
to
.
have
.
property
(
'removeRule'
)
expect
(
engine
)
.
to
.
have
.
property
(
'addOperator'
)
expect
(
engine
)
.
to
.
have
.
property
(
'removeOperator'
)
expect
(
engine
)
.
to
.
have
.
property
(
'addFact'
)
expect
(
engine
)
.
to
.
have
.
property
(
'removeFact'
)
expect
(
engine
)
.
to
.
have
.
property
(
'run'
)
expect
(
engine
)
.
to
.
have
.
property
(
'stop'
)
}
)
describe
(
'constructor'
,
(
)
=>
{
it
(
'initializes with the default state'
,
(
)
=>
{
expect
(
engine
.
status
)
.
to
.
equal
(
'READY'
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
0
)
defaultOperators
.
forEach
(
op
=>
{
expect
(
engine
.
operators
.
get
(
op
.
name
)
)
.
to
.
be
.
an
.
instanceof
(
Operator
)
}
)
}
)
it
(
'can be initialized with rules'
,
(
)
=>
{
const
rules
=
[
factories
.
rule
(
)
,
factories
.
rule
(
)
,
factories
.
rule
(
)
]
engine
=
engineFactory
(
rules
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
rules
.
length
)
}
)
}
)
describe
(
'stop()'
,
(
)
=>
{
it
(
'changes the status to "FINISHED"'
,
(
)
=>
{
expect
(
engine
.
stop
(
)
.
status
)
.
to
.
equal
(
'FINISHED'
)
}
)
}
)
describe
(
'addRule()'
,
(
)
=>
{
describe
(
'rule instance'
,
(
)
=>
{
it
(
'adds the rule'
,
(
)
=>
{
const
rule
=
new
Rule
(
factories
.
rule
(
)
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
0
)
engine
.
addRule
(
rule
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
1
)
expect
(
engine
.
rules
)
.
to
.
include
(
rule
)
}
)
}
)
describe
(
'required fields'
,
(
)
=>
{
it
(
'.conditions'
,
(
)
=>
{
const
rule
=
factories
.
rule
(
)
delete
rule
.
conditions
expect
(
(
)
=>
{
engine
.
addRule
(
rule
)
}
)
.
to
.
throw
(
/
E
n
g
i
n
e
:
a
d
d
R
u
l
e
\(
\)
a
r
g
u
m
e
n
t
r
e
q
u
i
r
e
s
"
c
o
n
d
i
t
i
o
n
s
"
p
r
o
p
e
r
t
y
/
)
}
)
it
(
'.event'
,
(
)
=>
{
const
rule
=
factories
.
rule
(
)
delete
rule
.
event
expect
(
(
)
=>
{
engine
.
addRule
(
rule
)
}
)
.
to
.
throw
(
/
E
n
g
i
n
e
:
a
d
d
R
u
l
e
\(
\)
a
r
g
u
m
e
n
t
r
e
q
u
i
r
e
s
"
e
v
e
n
t
"
p
r
o
p
e
r
t
y
/
)
}
)
}
)
}
)
describe
(
'updateRule()'
,
(
)
=>
{
it
(
'updates rule'
,
(
)
=>
{
let
rule1
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule1'
}
)
)
let
rule2
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule2'
}
)
)
engine
.
addRule
(
rule1
)
engine
.
addRule
(
rule2
)
expect
(
engine
.
rules
[
0
]
.
conditions
.
all
.
length
)
.
to
.
equal
(
2
)
expect
(
engine
.
rules
[
1
]
.
conditions
.
all
.
length
)
.
to
.
equal
(
2
)
rule1
.
setConditions
(
{
all
:
[
]
}
)
engine
.
updateRule
(
rule1
)
rule1
=
engine
.
rules
.
find
(
rule
=>
rule
.
name
===
'rule1'
)
rule2
=
engine
.
rules
.
find
(
rule
=>
rule
.
name
===
'rule2'
)
expect
(
rule1
.
conditions
.
all
.
length
)
.
to
.
equal
(
0
)
expect
(
rule2
.
conditions
.
all
.
length
)
.
to
.
equal
(
2
)
}
)
it
(
'updates rule incorrectly'
,
async
(
)
=>
{
const
rule1
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule1'
}
)
)
engine
.
addRule
(
rule1
)
rule1
.
conditions
=
{
all
:
[
]
}
// Rule.conditions should not be set to a value that is not an instance of Condition
engine
.
updateRule
(
rule1
)
const
successSpy
=
sandbox
.
spy
(
)
rule1
.
on
(
'success'
,
successSpy
)
await
engine
.
run
(
)
const
ruleResult
=
successSpy
.
getCall
(
0
)
.
args
[
2
]
expect
(
(
)
=>
JSON
.
stringify
(
ruleResult
)
)
.
to
.
throw
(
/
t
o
J
S
O
N
i
s
n
o
t
a
f
u
n
c
t
i
o
n
/
)
}
)
it
(
'should throw error if rule not found'
,
(
)
=>
{
const
rule1
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule1'
}
)
)
engine
.
addRule
(
rule1
)
const
rule2
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule2'
}
)
)
expect
(
(
)
=>
{
engine
.
updateRule
(
rule2
)
}
)
.
to
.
throw
(
/
E
n
g
i
n
e
:
u
p
d
a
t
e
R
u
l
e
\(
\)
r
u
l
e
n
o
t
f
o
u
n
d
/
)
}
)
}
)
describe
(
'removeRule()'
,
(
)
=>
{
function
setup
(
)
{
const
rule1
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule1'
}
)
)
const
rule2
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule2'
}
)
)
engine
.
addRule
(
rule1
)
engine
.
addRule
(
rule2
)
engine
.
prioritizeRules
(
)
return
[
rule1
,
rule2
]
}
context
(
'remove by rule.name'
,
(
)
=>
{
it
(
'removes a single rule'
,
(
)
=>
{
const
[
rule1
]
=
setup
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
const
isRemoved
=
engine
.
removeRule
(
rule1
.
name
)
expect
(
isRemoved
)
.
to
.
be
.
true
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
1
)
expect
(
engine
.
prioritizedRules
)
.
to
.
equal
(
null
)
}
)
it
(
'removes multiple rules with the same name'
,
(
)
=>
{
const
[
rule1
]
=
setup
(
)
const
rule3
=
new
Rule
(
factories
.
rule
(
{
name
:
rule1
.
name
}
)
)
engine
.
addRule
(
rule3
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
3
)
const
isRemoved
=
engine
.
removeRule
(
rule1
.
name
)
expect
(
isRemoved
)
.
to
.
be
.
true
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
1
)
expect
(
engine
.
prioritizedRules
)
.
to
.
equal
(
null
)
}
)
it
(
'returns false when rule cannot be found'
,
(
)
=>
{
setup
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
const
isRemoved
=
engine
.
removeRule
(
'not-found-name'
)
expect
(
isRemoved
)
.
to
.
be
.
false
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
expect
(
engine
.
prioritizedRules
)
.
to
.
not
.
equal
(
null
)
}
)
}
)
context
(
'remove by rule object'
,
(
)
=>
{
it
(
'removes a single rule'
,
(
)
=>
{
const
[
rule1
]
=
setup
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
const
isRemoved
=
engine
.
removeRule
(
rule1
)
expect
(
isRemoved
)
.
to
.
be
.
true
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
1
)
expect
(
engine
.
prioritizedRules
)
.
to
.
equal
(
null
)
}
)
it
(
'removes a single rule, even if two have the same name'
,
(
)
=>
{
const
[
rule1
]
=
setup
(
)
const
rule3
=
new
Rule
(
factories
.
rule
(
{
name
:
rule1
.
name
}
)
)
engine
.
addRule
(
rule3
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
3
)
const
isRemoved
=
engine
.
removeRule
(
rule1
)
expect
(
isRemoved
)
.
to
.
be
.
true
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
expect
(
engine
.
prioritizedRules
)
.
to
.
equal
(
null
)
}
)
it
(
'returns false when rule cannot be found'
,
(
)
=>
{
setup
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
const
rule3
=
new
Rule
(
factories
.
rule
(
{
name
:
'rule3'
}
)
)
const
isRemoved
=
engine
.
removeRule
(
rule3
)
expect
(
isRemoved
)
.
to
.
be
.
false
(
)
expect
(
engine
.
rules
.
length
)
.
to
.
equal
(
2
)
expect
(
engine
.
prioritizedRules
)
.
to
.
not
.
equal
(
null
)
}
)
}
)
}
)
describe
(
'addOperator()'
,
(
)
=>
{
it
(
'adds the operator'
,
(
)
=>
{
engine
.
addOperator
(
'startsWithLetter'
,
(
factValue
,
jsonValue
)
=>
{
return
factValue
[
0
]
===
jsonValue
}
)
expect
(
engine
.
operators
.
get
(
'startsWithLetter'
)
)
.
to
.
exist
(
)
expect
(
engine
.
operators
.
get
(
'startsWithLetter'
)
)
.
to
.
be
.
an
.
instanceof
(
Operator
)
}
)
it
(
'accepts an operator instance'
,
(
)
=>
{
const
op
=
new
Operator
(
'my-operator'
,
_
=>
true
)
engine
.
addOperator
(
op
)
expect
(
engine
.
operators
.
get
(
'my-operator'
)
)
.
to
.
equal
(
op
)
}
)
}
)
describe
(
'removeOperator()'
,
(
)
=>
{
it
(
'removes the operator'
,
(
)
=>
{
engine
.
addOperator
(
'startsWithLetter'
,
(
factValue
,
jsonValue
)
=>
{
return
factValue
[
0
]
===
jsonValue
}
)
expect
(
engine
.
operators
.
get
(
'startsWithLetter'
)
)
.
to
.
be
.
an
.
instanceof
(
Operator
)
engine
.
removeOperator
(
'startsWithLetter'
)
expect
(
engine
.
operators
.
get
(
'startsWithLetter'
)
)
.
to
.
be
.
null
(
)
}
)
it
(
'can only remove added operators'
,
(
)
=>
{
const
isRemoved
=
engine
.
removeOperator
(
'nonExisting'
)
expect
(
isRemoved
)
.
to
.
equal
(
false
)
}
)
}
)
describe
(
'addFact()'
,
(
)
=>
{
const
FACT_NAME
=
'FACT_NAME'
const
FACT_VALUE
=
'FACT_VALUE'
function
assertFact
(
engine
)
{
expect
(
engine
.
facts
.
size
)
.
to
.
equal
(
1
)
expect
(
engine
.
facts
.
has
(
FACT_NAME
)
)
.
to
.
be
.
true
(
)
}
it
(
'allows a constant fact'
,
(
)
=>
{
engine
.
addFact
(
FACT_NAME
,
FACT_VALUE
)
assertFact
(
engine
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
value
)
.
to
.
equal
(
FACT_VALUE
)
}
)
it
(
'allows options to be passed'
,
(
)
=>
{
const
options
=
{
cache
:
false
}
engine
.
addFact
(
FACT_NAME
,
FACT_VALUE
,
options
)
assertFact
(
engine
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
value
)
.
to
.
equal
(
FACT_VALUE
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
options
)
.
to
.
eql
(
options
)
}
)
it
(
'allows a lamba fact with no options'
,
(
)
=>
{
engine
.
addFact
(
FACT_NAME
,
async
(
params
,
engine
)
=>
{
return
FACT_VALUE
}
)
assertFact
(
engine
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
value
)
.
to
.
be
.
undefined
(
)
}
)
it
(
'allows a lamba fact with options'
,
(
)
=>
{
const
options
=
{
cache
:
false
}
engine
.
addFact
(
FACT_NAME
,
async
(
params
,
engine
)
=>
{
return
FACT_VALUE
}
,
options
)
assertFact
(
engine
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
options
)
.
to
.
eql
(
options
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
value
)
.
to
.
be
.
undefined
(
)
}
)
it
(
'allows a fact instance'
,
(
)
=>
{
const
options
=
{
cache
:
false
}
const
fact
=
new
Fact
(
FACT_NAME
,
50
,
options
)
engine
.
addFact
(
fact
)
assertFact
(
engine
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
)
.
to
.
exist
(
)
expect
(
engine
.
facts
.
get
(
FACT_NAME
)
.
options
)
.
to
.
eql
(
options
)
}
)
}
)
describe
(
'removeFact()'
,
(
)
=>
{
it
(
'removes a Fact'
,
(
)
=>
{
expect
(
engine
.
facts
.
size
)
.
to
.
equal
(
0
)
const
fact
=
new
Fact
(
'newFact'
,
50
,
{
cache
:
false
}
)
engine
.
addFact
(
fact
)
expect
(
engine
.
facts
.
size
)
.
to
.
equal
(
1
)
engine
.
removeFact
(
'newFact'
)
expect
(
engine
.
facts
.
size
)
.
to
.
equal
(
0
)
}
)
it
(
'can only remove added facts'
,
(
)
=>
{
expect
(
engine
.
facts
.
size
)
.
to
.
equal
(
0
)
const
isRemoved
=
engine
.
removeFact
(
'newFact'
)
expect
(
isRemoved
)
.
to
.
equal
(
false
)
}
)
}
)
describe
(
'run()'
,
(
)
=>
{
beforeEach
(
(
)
=>
{
const
conditions
=
{
all
:
[
{
fact
:
'age'
,
operator
:
'greaterThanInclusive'
,
value
:
18
}
]
}
const
event
=
{
type
:
'generic'
}
const
rule
=
factories
.
rule
(
{
conditions
,
event
}
)
engine
.
addRule
(
rule
)
engine
.
addFact
(
'age'
,
20
)
}
)
it
(
'changes the status to "RUNNING"'
,
(
)
=>
{
const
eventSpy
=
sandbox
.
spy
(
)
engine
.
on
(
'success'
,
(
event
,
almanac
)
=>
{
eventSpy
(
)
expect
(
engine
.
status
)
.
to
.
equal
(
'RUNNING'
)
}
)
return
engine
.
run
(
)
}
)
it
(
'changes status to FINISHED once complete'
,
async
(
)
=>
{
expect
(
engine
.
status
)
.
to
.
equal
(
'READY'
)
await
engine
.
run
(
)
expect
(
engine
.
status
)
.
to
.
equal
(
'FINISHED'
)
}
)
}
)
}
)
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