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/*global describe,it,expect,beforeEach*/
describe("injector", function() {
var injector;
beforeEach(function() {
injector = new Injector();
});
describe("#register()", function() {
it("should return the injector", function() {
var result = injector.register("A", function(){ return "A"; });
expect(result).toBe(injector);
});
it("should use a function's name if no name provided", function() {
injector.register(function A(){ return "A"; });
expect(injector.specs.A).not.toBe(undefined); // IMPLEMENTATION DETAIL
});
it("should register an object as a series of dependencies", function() {
injector.register({
A: function(){ return "A"; },
B: function(){ return "B"; }
});
expect(injector.specs.A).not.toBe(undefined); // IMPLEMENTATION DETAIL
expect(injector.specs.B).not.toBe(undefined); // IMPLEMENTATION DETAIL
});
});
describe("#get()", function() {
it("should throw if the dependency can't be found", function() {
expect(function() {
injector.get("A");
}).toThrow();
});
});
describe("#invoke()", function() {
it("should be able to invoke a function with no dependencies", function() {
var A = injector.invoke(function() {return "functionResult";});
expect(A).toBe("functionResult");
});
it("should be able to invoke a function with a dependency in an array", function() {
injector.register("B", function() {return "constructorB";});
var A = injector.invoke(["B", function(B) {return B + "A";}]);
expect(A).toBe("constructorBA");
});
it("should be able to invoke a function with an implicit dependency", function() {
injector.register("B", function() {return "constructorB";});
var A = injector.invoke(function(B) {return B + "A";});
expect(A).toBe("constructorBA");
});
it("should not touch any exceptions thrown by the function", function() {
expect(function() {
throw new Error("An error");
}).toThrow(new Error("An error"));
});
it("should invoke the function with 'this' set to the injector", function() {
var hasRun = false;
injector.invoke(function() {
hasRun = true;
expect(this).toBe(injector);
});
expect(hasRun).toBe(true);
});
it("should not provide 'this.requestor' to the invoked function", function() {
var caught = {};
try {
injector.invoke(function() {
this.requestor();
});
} catch (e) {
caught = e;
}
expect(caught.name).toBe("InjectorError");
});
});
describe("constructor dependency injection", function() {
it("should be able to register a constructor with no dependencies, and get the value for it", function() {
injector.register("A", function() {return "constructorA";});
var A = injector.get("A");
expect(A).toBe("constructorA");
});
it("should be able to register a constructor with a dependency in an array, and get the value for it", function() {
injector.register("B", function() {return "constructorB";});
injector.register("A", ["B", function(B) {return B;}]);
var A = injector.get("A");
expect(A).toBe("constructorB");
});
it("should be able to register a constructor with an implicit dependency, and get the value for it", function() {
injector.register("B", function() {return "constructorB";});
injector.register("A", function(B) {return B;});
var A = injector.get("A");
expect(A).toBe("constructorB");
});
it("should be able to register a constructor with an implicit name", function() {
injector.register(function A() {return "constructorA";});
var A = injector.get("A");
expect(A).toBe("constructorA");
});
it("should be able to register constructors with an object", function() {
injector.register({
A: ["B", function (B) {return "constructorA" + B;}],
B: function(C) { return "B" + C; },
C: function() { return "C"; }
});
var A = injector.get("A");
expect(A).toBe("constructorABC");
});
it("should wrap any exceptions thrown by constructors", function() {
var error = new Error("constructorA");
injector.register("A", function() {throw error;});
var caught = {};
try {
injector.get("A");
} catch (e) {
caught = e;
}
expect(caught.name).toBe("InjectorError");
expect(caught.cause).toBe(error);
});
it("should detect circular dependencies", function() {
injector.register("A", ["B", function(B) {return null;}]);
injector.register("B", ["A", function(A) {return null;}]);
var caught = {message: ''};
try {
injector.get("A");
} catch (e) {
caught = e;
}
expect(caught.message.indexOf("Cyclic dependency detected")).toBe(0);
});
it("should provide access to the requestor through 'this.requestor()'", function() {
injector.register("B", function() {
expect(this.requestor()).toBe("A");
return "returnValueB";
});
injector.register("A", ["B", function(B) {
return B + "A";
}]);
// make sure the function actually ran
expect(injector.get("A")).toBe("returnValueBA");
});
});
describe("caching", function() {
it("should return the same exact value for multiple requests of the same dependency", function() {
injector.register("A", function() {return {an: 'object'};});
var first = injector.get("A");
var second = injector.get("A");
expect(first).toBe(second);
});
it("shouldn't re-run constructors for cached values", function() {
var numTimes = 0;
injector.register("A", function() {
numTimes++;
if (numTimes > 1)
throw new Error("Shouldn't be run more than once");
return {an: 'object'};
});
var first = injector.get("A");
var second = injector.get("A");
expect(first).toBe(second);
});
it("shouldn't cache values which depend on their requestor", function() {
var numTimes = 0;
injector.register("A", function() {
numTimes++;
return "A" + this.requestor();
});
injector.register("B", ["A", function(A) {return "B" + A;}]);
injector.register("C", ["A", function(A) {return "C" + A;}]);
expect(injector.get("B")).toBe("BAB");
expect(injector.get("C")).toBe("CAC");
expect(numTimes).toBe(2);
});
});
});
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