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Commit74dcfec

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committed
__set__ returns an 'undo' function that when invoked will restore the module to the values it had before it was called
1 parentd4bc650 commit74dcfec

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2 files changed

+34
-4
lines changed

2 files changed

+34
-4
lines changed

‎lib/__set__.js

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -11,10 +11,12 @@
1111
*@throws {ReferenceError} When the variable is unknown
1212
*@return {*}
1313
*/
14+
1415
function__set__(){
1516
arguments.varName=arguments[0];
1617
arguments.varValue=arguments[1];
1718
arguments.src="";
19+
varsnapshot={};
1820

1921
if(typeofarguments[0]==="object"&&arguments.length===1){
2022
arguments.env=arguments.varName;
@@ -25,18 +27,23 @@ function __set__() {
2527
if(arguments.env.hasOwnProperty(arguments.varName)){
2628
arguments.varValue=arguments.env[arguments.varName];
2729
arguments.src+=arguments.varName+" = arguments.env."+arguments.varName+"; ";
30+
snapshot[arguments.varName]=eval(arguments.varName);
2831
}
2932
}
3033
}elseif(typeofarguments.varName==="string"&&arguments.length===2){
3134
if(!arguments.varName){
3235
thrownewTypeError("__set__ expects a non-empty string as a variable name");
3336
}
3437
arguments.src=arguments.varName+" = arguments.varValue;";
38+
snapshot[arguments.varName]=eval(arguments.varName);
3539
}else{
3640
thrownewTypeError("__set__ expects an environment object or a non-empty string as a variable name");
3741
}
3842

3943
eval(arguments.src);
44+
returnfunction(){
45+
__set__(snapshot);
46+
};
4047
}
4148

42-
module.exports=__set__;
49+
module.exports=__set__;

‎test/__set__.test.js

Lines changed: 26 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -69,8 +69,31 @@ describe("__set__", function () {
6969
expect(moduleFake.getValue()).to.be(2);
7070
expect(moduleFake.getReference()).to.be(newObj);
7171
});
72-
it("should return undefined",function(){
73-
expect(moduleFake.__set__("myValue",4)).to.be(undefined);
72+
it("should return a function that when invoked reverts to the values before set was called",function(){
73+
undo=moduleFake.__set__("myValue",4)
74+
expect(typeofundo).to.be("function");
75+
expect(moduleFake.getValue()).to.be(4);
76+
undo()
77+
expect(moduleFake.getValue()).to.be(0);
78+
});
79+
it("should be able to revert when calling with an env-obj",function(){
80+
varnewObj={hello:"hello"};
81+
82+
expect(moduleFake.getValue()).to.be(0);
83+
expect(moduleFake.getReference()).to.eql({});
84+
85+
varundo=moduleFake.__set__({
86+
myValue:2,
87+
myReference:newObj
88+
});
89+
90+
expect(moduleFake.getValue()).to.be(2);
91+
expect(moduleFake.getReference()).to.be(newObj);
92+
93+
undo();
94+
95+
expect(moduleFake.getValue()).to.be(0);
96+
expect(moduleFake.getReference()).to.eql({});
7497
});
7598
it("should throw a TypeError when passing misfitting params",function(){
7699
expect(function(){
@@ -101,4 +124,4 @@ describe("__set__", function () {
101124
moduleFake.__set__("someVar");// misfitting number of params
102125
}).to.throwException(expectTypeError);
103126
});
104-
});
127+
});

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