fast-check
Version:
Property based testing framework for JavaScript (like QuickCheck)
111 lines (110 loc) • 5.04 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.CommandsArbitrary = void 0;
const Arbitrary_1 = require("../../check/arbitrary/definition/Arbitrary");
const Value_1 = require("../../check/arbitrary/definition/Value");
const CommandsIterable_1 = require("../../check/model/commands/CommandsIterable");
const CommandWrapper_1 = require("../../check/model/commands/CommandWrapper");
const ReplayPath_1 = require("../../check/model/ReplayPath");
const LazyIterableIterator_1 = require("../../stream/LazyIterableIterator");
const Stream_1 = require("../../stream/Stream");
const oneof_1 = require("../oneof");
const RestrictedIntegerArbitraryBuilder_1 = require("./builders/RestrictedIntegerArbitraryBuilder");
class CommandsArbitrary extends Arbitrary_1.Arbitrary {
constructor(commandArbs, maxGeneratedCommands, maxCommands, sourceReplayPath, disableReplayLog) {
super();
this.sourceReplayPath = sourceReplayPath;
this.disableReplayLog = disableReplayLog;
this.oneCommandArb = (0, oneof_1.oneof)(...commandArbs).map((c) => new CommandWrapper_1.CommandWrapper(c));
this.lengthArb = (0, RestrictedIntegerArbitraryBuilder_1.restrictedIntegerArbitraryBuilder)(0, maxGeneratedCommands, maxCommands);
this.replayPath = [];
this.replayPathPosition = 0;
}
metadataForReplay() {
return this.disableReplayLog ? '' : `replayPath=${JSON.stringify(ReplayPath_1.ReplayPath.stringify(this.replayPath))}`;
}
buildValueFor(items, shrunkOnce) {
const commands = items.map((item) => item.value_);
const context = { shrunkOnce, items };
return new Value_1.Value(new CommandsIterable_1.CommandsIterable(commands, () => this.metadataForReplay()), context);
}
generate(mrng) {
const size = this.lengthArb.generate(mrng, undefined);
const sizeValue = size.value;
const items = Array(sizeValue);
for (let idx = 0; idx !== sizeValue; ++idx) {
const item = this.oneCommandArb.generate(mrng, undefined);
items[idx] = item;
}
this.replayPathPosition = 0;
return this.buildValueFor(items, false);
}
canShrinkWithoutContext(value) {
return false;
}
filterOnExecution(itemsRaw) {
const items = [];
for (const c of itemsRaw) {
if (c.value_.hasRan) {
this.replayPath.push(true);
items.push(c);
}
else
this.replayPath.push(false);
}
return items;
}
filterOnReplay(itemsRaw) {
return itemsRaw.filter((c, idx) => {
const state = this.replayPath[this.replayPathPosition + idx];
if (state === undefined)
throw new Error(`Too short replayPath`);
if (!state && c.value_.hasRan)
throw new Error(`Mismatch between replayPath and real execution`);
return state;
});
}
filterForShrinkImpl(itemsRaw) {
if (this.replayPathPosition === 0) {
this.replayPath = this.sourceReplayPath !== null ? ReplayPath_1.ReplayPath.parse(this.sourceReplayPath) : [];
}
const items = this.replayPathPosition < this.replayPath.length
? this.filterOnReplay(itemsRaw)
: this.filterOnExecution(itemsRaw);
this.replayPathPosition += itemsRaw.length;
return items;
}
shrink(_value, context) {
if (context === undefined) {
return Stream_1.Stream.nil();
}
const safeContext = context;
const shrunkOnce = safeContext.shrunkOnce;
const itemsRaw = safeContext.items;
const items = this.filterForShrinkImpl(itemsRaw);
if (items.length === 0) {
return Stream_1.Stream.nil();
}
const rootShrink = shrunkOnce
? Stream_1.Stream.nil()
: new Stream_1.Stream([[]][Symbol.iterator]());
const nextShrinks = [];
for (let numToKeep = 0; numToKeep !== items.length; ++numToKeep) {
nextShrinks.push((0, LazyIterableIterator_1.makeLazy)(() => {
const fixedStart = items.slice(0, numToKeep);
return this.lengthArb
.shrink(items.length - 1 - numToKeep, undefined)
.map((l) => fixedStart.concat(items.slice(items.length - (l.value + 1))));
}));
}
for (let itemAt = 0; itemAt !== items.length; ++itemAt) {
nextShrinks.push((0, LazyIterableIterator_1.makeLazy)(() => this.oneCommandArb
.shrink(items[itemAt].value_, items[itemAt].context)
.map((v) => items.slice(0, itemAt).concat([v], items.slice(itemAt + 1)))));
}
return rootShrink.join(...nextShrinks).map((shrinkables) => {
return this.buildValueFor(shrinkables.map((c) => new Value_1.Value(c.value_.clone(), c.context)), true);
});
}
}
exports.CommandsArbitrary = CommandsArbitrary;