import { SpyFactoryFn } from '../types';
import { DeclarativeTestState } from './types';
export declare class NgtxTestEnv {
    private spyFactory;
    private testState;
    get isAssertionNegated(): boolean | undefined;
    getState(): {
        negateAssertion?: boolean;
        predicate: (() => void)[];
        assertion: (() => void)[];
        spyRegistry: import("./types").SpyRegisterEntry[];
    };
    /**
     * Takes a test state and adds its contents to the current internal test-state.
     * Be aware: It will override the internal test state's `negateAssertion` property, though.
     */
    importState(state: DeclarativeTestState): void;
    constructor(spyFactory: SpyFactoryFn);
    spyOn: <T>(host: () => T, methodName: keyof T | "ngtx:spyEvent", returnValue?: any) => any;
    executeTest(): void;
    addAssertion: (fn: () => void) => void;
    addPredicate: (fn: () => void) => void;
    /** Takes a test state and uses it to override the internal test state. */
    overrideState: (newState: Partial<DeclarativeTestState>) => void;
    negateAssertion: () => void;
    private tryPlaceSpies;
}