aft-core

AFT-Core

the base Automated Functional Testing (AFT) library providing support for Plugins, configuration, and helper classes and functions

Installation

> npm i aft-core

Configuration

the aft-core package contains the cfgmgr constant class for reading in configuration from multiple different sources all chained in the following order by default, but updatable using cfgmgr.set((configKey: string, options: object) => new ChainedProvider([new ProviderOne(), new ProviderTwo(), ...])):

• OptionsProvider - reads from the passed in options object passed to cfgmgr.get(configKey, options)
• EnvVarProvider - reads from the process.env prepending all environment variable keys with the supplied configKey
• AftConfigProvider - reads from the aftconfig.json file starting from a property named with the supplied configKey

Ex: with an aftconfig.json containing:

{
    "ConfigSectionName": {
        "config_field3": "%your_env_var%",
        "config_field4": "some-value",
        "config_field5": "['foo', true, 10]"
    }
}

and with the following environment variables set:

export your_env_var="an important value"

can be accessed using the cfgmgr as follows:

const config = cfgmgr.get('ConfigSectionName', {
    config_field1: 12345,
    config_field2: true,
    config_field4: 'a value here'
});
await config.get('config_field1', -1); // returns 12345
await config.get('config_field2', true); // returns false
await config.get<string>('config_field3'); // returns "an important value"
await config.get('config_field4', 'no value'); // returns "a value here" (passed in options override aftconfig.json values)
await config.get<string>('config_field5'); // returns ["foo", true, 10] as an array

for classes that rely on dependency injected options, there is also the optmgr constant class that will extract environment variables and JSON objects from a object passed to the optmgr.process() function. this is useful when combined with the IHasOptions<T> interface resulting in easier scoping of lookups on the passed in options object.

NOTE: the optmgr.process function is used in the OptionsProvider and AftConfigProvider classes before returning the values for a given key

Helpers

the aft-core package contains several helper and utility classes, interfaces and functions to make functional testing and test development easier. These include:

• rand - random string, boolean, number and uuid generation
• convert - string manipulation like Base64 encode / decode and replacement
• ellide - string elliding supporting beginning, middle and end ellipsis
• Err - a module that can run functions in a try-catch with optional logging as well as provide formatted string outputs from Error objects
• wait - continually retry some action until success or a maximum time elapses
• using - automatically call the dispose function of a class that implements the IDisposable interface when done
• verify - a function accepting an assertion function that simplifies usage of a Verifier within your Jasmine or Mocha tests
• MachineInfo - get details of the host machine and user running the tests
• CacheMap - a Map implementation that stores values with expirations where expired items will not be returned and are pruned from the Map automatically. The CacheMap can also optionally store its data on the filesystem allowing for other running node processes to read from the same cache data (e.g. sharded parallel testing)
• FileSystemMap - a Map implementation that stores its values in a file on the filesystem allowing multiple node processes to share the map data or to persist the data over multiple iterations
• fileio - a constant class providing file system write, readAs<T> and getExpiringFileLock functions to simplify file operations
• wait - constant class providing wait.untilTrue(...) and wait.forDuration(number) functions to allow for non-thread-locking waits
• verifier - see: Testing with the Verifier section below

Custom Types

aft-core also comes with some helpful types that can make building automated tests a bit easier such as:

• Action<T> - a function accepting one typed argument T and returning void
• Func<T, Tr> - a function accepting one typed argument T and returning a specified type Tr
• Class<T> - a class of type T accepting 0 or more arguments on the constructor
• ProcessingResult - a more expressive return value that can be used when you want both a boolean success and data as a result
• JsonObject - an object that can be serialised and deserialised into a Javascript Object without loss of data
• JsonKey - a value that can be used as a valid JSON object key
• JsonValue - value that can be used as a valid JSON object value
• Merge<T1, T2, T3 = {}, T4 = {}, T5 = {}, T6 = {}> - a type that can be used to create merged types (types made up of 2 or more types)

Plugins

Example Logging Plugin

to create your own simple logging plugin that stores all logs until the dispose function is called you would implement the code below.

NOTE: configuration for the below can be added in a object in the aftconfig.json named ondisposeconsolelogger based on the key passed to the LoggingPlugin constructor

export type OnDisposeConsoleLoggerOptions = Merge<LoggingPluginOptions, {
    maxLogLines?: number;
}>;
export class OnDisposeConsoleLogger extends LoggingPlugin<OnDisposeConsoleLoggerOptions> {
    private _logs: Array<LogMessageData>;
    private _maxLines: number;
    constructor(options?: OnDisposeConsoleLoggerOptions) {
        super(options);
        this._logs = new Array<LogMessageData>();
    }
    get maxLogLines(): number {
        if (!this._maxLines) {
            this._maxLines = this.option('maxLogLines', 100);
        }
        return this._maxLines;
    }
    async log(data: LogMessageData): Promise<void> {
        let l: LoggingLevel = this.level;
        if (LogLevel.toValue(data.level) >= LogLevel.toValue(l) && level != 'none') {
            this._logs.push(data);
            while (this._logs.length > this.maxLogLines) {
                this._logs.shift();
            }
        }
    }
    async logResult(name: string, result: ITestResult): Promise<void> { 
        if (result.status == 'Passed') {
            this.log(LoggingLevel.pass, JSON.stringify(result));
        } else {
            this.log(LogginLevel.fail, JSON.stringify(result));
        }
    }
    async dispose(name: string, error?: Error): Promise<void> { 
        this._logs.forEach((message) => {
            LogManager.toConsole(message);
        });
        if (error) {
            LogManager.toConsole({name: this.logName, level: 'error', message: Err.full(error.message)});
        }
        LogManager.toConsole({name: this.logName, level: 'info', message: 'OnDisposeConsoleLogger is now disposed!'});
    }
}

Example Test Case Plugin (TestRail)

export type TestRailTestCasePluginOptions = Merge<TestCasePluginOptions, {
    client?: TestRailClient;
}>;
export class TestRailTestCasePlugin extends TestCasePlugin<TestRailTestCasePluginOptions> {
    private _client: TestRailClient;
    get client(): TestRailClient {
        if (!this._client) {
            this._client = this.option('client') || new TestRailClient();
        }
        return this._client;
    }
    async getTestCase(testId: string): Promise<ITestCase> {
        return await this.client.getTestCase(testId);
    }
    async findTestCases(searchTerm: string): Promise<ITestCase[]> {
        return await this.client.findTestCases(searchTerm);
    }
    async shouldRun(testId: string): Promise<ProcessingResult> {
        return await this.client.shouldRun(testId);
    }
    async dispose(error?: Error) { /* perform some action if needed */ }
}

Example Defect Plugin (Bugzilla)

export type BugzillaDefectPluginOptions = Merge<DefectPluginOptions, {
    client?: BugzillaClient;
}>;

export class BugzillaDefectPlugin extends DefectPlugin<BugzillaDefectPluginOptions> {
    private _client: BugzillaClient;
    get client(): TestRailClient {
        if (!this._client) {
            this._client = this.option('client') || new BugzillaClient();
        }
        return this._client;
    }
    async getDefect(defectId: string): Promise<IDefect> {
        return await this.client.getDefect(defectId);
    }
    async findDefects(searchTerm: string): Promise<IDefect[]> {
        return await this.client.findDefects(searchTerm);
    }
    async dispose(error?: Error) { /* perform some action if needed */ }
}

Testing with the Verifier

the Verifier class and verify functions of aft-core enable testing with pre-execution filtering based on integration with external test case and defect managers via plugin packages supporting each (see examples above).

describe('Sample Test', () => {
    it('can perform a demonstration of AFT', async () => {
        let feature: FeatureObj = new FeatureObj();
        /**
         * the `verify(assertion).returns(expectation)` function
         * checks any specified `TestCasePlugin`
         * and `DefectPlugin` implementations
         * to ensure the test should be run. It will then
         * report to any `LoggingPlugin` implementations
         * with an `TestResult` indicating the success,
         * failure or skipped status
         */
        await verify(async () => await feature.performAction())
        .withTestId('C1234')
        .and.withKnownDefectId('DEFECT-123')
        .and.withDescription("expect that performAction will return 'result of action'")
        .returns('result of action');
    });
});

in the above example, the await feature.performAction() call will only be run if a TestCasePlugin is loaded and returns true from it's shouldRun(testId: string) function (or no TestCasePlugin is loaded) and if a DefectPlugin is loaded and returns either no defect or a closed defect from it's getDefect(defectId: string) function (or no DefectPlugin is loaded). additionally, any logs associated with the above verify call will use a logName of "expect_that_performAction_will_return_result_of_action" resulting in log lines like the following:

09:14:01 - [expect that performAction will return 'result of action'] - TRACE - no TestCasePlugin in use so run all tests
09:14:02 - [expect that performAction will return 'result of action'] - TRACE - no DefectPlugin in use so run all tests