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The @prismatic-io/spectral package exports a testing module with utilities for writing unit tests against your custom component actions, triggers, data sources, and code-native integration flows. Tests run in any Jest-compatible environment, including Vitest.

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Two testing approaches

Spectral provides two complementary APIs for testing:
APIBest for
Standalone invoke* functionsTesting individual action, trigger, or data source definitions directly
createHarness()Testing a complete assembled component with multiple actions, triggers, and data sources
Both approaches automatically create a mock action context (including a mock logger) so you do not need to construct one yourself.

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Setting up your test environment

1

Install a test runner

Spectral’s testing utilities are compatible with any Jest-compatible runner. Vitest is recommended for new projects.
npm install --save-dev vitest
Add a test script to your package.json:
package.json
{
  "scripts": {
    "test": "vitest run"
  }
}
2

Import testing utilities

Import the testing helpers you need from the testing sub-module:
my-component.test.ts
import { describe, expect, it } from "vitest";
import {
  invoke,
  invokeTrigger,
  invokeDataSource,
  invokeFlow,
  createHarness,
  createConnection,
  connectionValue,
  loggerMock,
  createMockContextComponents,
} from "@prismatic-io/spectral/dist/testing";
3

Write your first test

Call invoke() with your action definition and input parameters:
my-action.test.ts
import { describe, expect, it } from "vitest";
import { invoke } from "@prismatic-io/spectral/dist/testing";
import { myAction } from "./src/actions";

describe("myAction", () => {
  it("returns expected data", async () => {
    const { result } = await invoke(myAction, {
      myInput: "hello",
    });
    expect(result.data).toBe("hello");
  });
});

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Core testing functions

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invoke(action, params, context?)

Invokes an ActionDefinition’s perform function directly. Returns { result, loggerMock }. 
import { invoke } from "@prismatic-io/spectral/dist/testing";

const { result, loggerMock } = await invoke(myAction, {
  username: "alice",
  password: "secret",
});
See Unit testing actions for full details.

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invokeTrigger(trigger, context?, payload?, params?)

Invokes a TriggerDefinition’s perform function. Automatically merges a default trigger payload so you only need to supply fields you care about. 
import { invokeTrigger } from "@prismatic-io/spectral/dist/testing";

const { result } = await invokeTrigger(myTrigger, undefined, {
  body: { data: { event: "order.created" } },
});
See Unit testing triggers for full details.

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invokeDataSource(dataSource, params, context?)

Invokes a DataSourceDefinition’s perform function and returns its result directly. 
import { invokeDataSource } from "@prismatic-io/spectral/dist/testing";

const result = await invokeDataSource(myDataSource, {});
expect(result.result).toStrictEqual("Hello");

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invokeFlow(flow, options?)

Invokes a code-native integration Flow, running both the trigger (onTrigger) and execution (onExecution) functions. Accepts configVars, context, and payload options. 
import { invokeFlow } from "@prismatic-io/spectral/dist/testing";

const { result } = await invokeFlow(myFlow, {
  configVars: { "API Key": "test-key" },
  payload: { body: { data: { orderId: 42 } } },
});
See Unit testing flows for full details.

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createHarness(component)

Wraps a complete Component definition in a ComponentTestHarness that provides .action(), .trigger(), .dataSource(), and .connectionValue() methods. Input defaults and clean functions are applied automatically. 
import { createHarness } from "@prismatic-io/spectral/dist/testing";
import myComponent from "./src";

const harness = createHarness(myComponent);

const result = await harness.action("myAction", {
  fooInput: "hello",
});

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Connection helpers

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createConnection(definition, values, tokenValues?, displayName?)

Builds a ConnectionValue from a connection definition and plain field values, suitable for passing as an action parameter in tests. 
import { createConnection } from "@prismatic-io/spectral/dist/testing";
import { myConnection } from "./src/connections";

const conn = createConnection(myConnection, {
  username: "alice",
  password: "secret",
});

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connectionValue(envVarKey?)

Reads a ConnectionValue from an environment variable (defaults to PRISMATIC_CONNECTION_VALUE). Useful for CI pipelines where credentials should not be committed to source. 
import { connectionValue } from "@prismatic-io/spectral/dist/testing";

// Reads process.env.PRISMATIC_CONNECTION_VALUE
const conn = connectionValue();

// Or use a custom variable name
const conn2 = connectionValue("MY_CUSTOM_CONNECTION_VAR");
connectionValue() throws if the environment variable is not set. Export your connection JSON before running tests that depend on it.

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loggerMock()

Creates a mock ActionLogger where each log method (trace, debug, info, log, warn, error) is a spy. The mock logger is automatically attached to any context created by invoke* functions and is also returned in the InvokeReturn object so you can assert on it directly. 
import { loggerMock } from "@prismatic-io/spectral/dist/testing";

const logger = loggerMock();
// Each method is a spy — use expect(logger.info).toHaveBeenCalledWith(...)
When using invoke() or invokeTrigger(), the logger mock is returned alongside the result: 
const { result, loggerMock: logger } = await invoke(myAction, { input: "value" });
expect(logger.info).toHaveBeenCalledWith("Processing input: value");

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createMockContextComponents(registry, mocks?)

Generates a mock context.components object from a CNI component manifest registry. By default it returns each action’s examplePayload. Pass mocks.actions to override specific actions with custom implementations. 
import { createMockContextComponents } from "@prismatic-io/spectral/dist/testing";
import { componentRegistry } from "./src/componentRegistry";

const components = createMockContextComponents(componentRegistry, {
  actions: {
    myComponent: {
      myAction: () => Promise.resolve({ data: "mocked response" }),
    },
  },
});

const { result } = await invokeFlow(myFlow, {
  context: { components },
});
See Unit testing flows for a complete example.

Unit testing actions

Test action perform functions with invoke() or the harness .action() method.

Unit testing triggers

Test trigger perform, onInstanceDeploy, and onInstanceDelete with invokeTrigger().

Unit testing flows

Test code-native integration flows end-to-end with invokeFlow().

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