smartexpect/ts/smartexpect.classes.assertion.ts

import * as plugins from './smartexpect.plugins';

export type TExecutionType = 'sync' | 'async';

export class Assertion {
  executionMode: TExecutionType;
  baseReference: any;
  propertyDrillDown: string[] = [];
  private notSetting = false;
  private timeoutSetting = 0;
  constructor(baseReferenceArg: any, executionModeArg: TExecutionType) {
    this.baseReference = baseReferenceArg;
    this.executionMode = executionModeArg;
  }

  private getObjectToTestReference() {
    let returnObjectToTestReference = this.baseReference;
    for (const property of this.propertyDrillDown) {
      returnObjectToTestReference = returnObjectToTestReference[property];
    }
    return returnObjectToTestReference;
  }

  public get not() {
    this.notSetting = true;
    return this;
  }

  public timeout(millisArg: number) {
    this.timeoutSetting = millisArg;
    return this;
  }

  private runCheck(checkFunction: () => any) {
    const runDirectOrNegated = (checkFunction: () => any) => {
      if (!this.notSetting) {
        return checkFunction();
      } else {
        let isOk = false;
        try {
          runDirectOrNegated(checkFunction());
        } catch (e) {
          isOk = true;
        }
        if (!isOk) {
          throw new Error('Negated assertion is not ok!');
        }
      }
    };

    if (this.executionMode === 'async') {
      const done = plugins.smartpromise.defer();
      if (!(this.baseReference instanceof Promise)) {
        done.reject(new Error(`${this.baseReference} is not of type promise.`));
      } else {
        if (this.timeoutSetting) {
          plugins.smartdelay.delayFor(this.timeoutSetting).then(() => {
            if (done.status === 'pending') {
              done.reject(new Error(`${this.baseReference} timed out at ${this.timeoutSetting}!`));
            }
          });
        }
        this.baseReference.then((promiseResultArg) => {
          this.baseReference = promiseResultArg;
          done.resolve(runDirectOrNegated(checkFunction));
        });
      }
      return done.promise;
    } else {
      return runDirectOrNegated(checkFunction);
    }
  }

  public toBeTypeofString() {
    return this.runCheck(() => {
      if (typeof this.getObjectToTestReference() !== 'string') {
        throw new Error(
          `Assertion failed: ${this.baseReference} with drill down ${this.propertyDrillDown} is not of type string, but typeof ${typeof this
            .baseReference}`
        );
      }
    });
  }

  public toBeTypeofNumber() {
    return this.runCheck(() => {
      if (typeof this.getObjectToTestReference() !== 'number') {
        throw new Error(
          `Assertion failed: ${this.baseReference} with drill down ${this.propertyDrillDown} is not of type string, but typeof ${typeof this
            .baseReference}`
        );
      }
    });
  }

  public toBeTypeofBoolean() {
    return this.runCheck(() => {
      if (typeof this.getObjectToTestReference() !== 'boolean') {
        throw new Error(
          `Assertion failed: ${this.baseReference} with drill down ${this.propertyDrillDown} is not of type string, but typeof ${typeof this
            .baseReference}`
        );
      }
    });
  }

  public toEqual(comparisonObject: any) {
    return this.runCheck(() => {
      const result = plugins.fastDeepEqual(this.getObjectToTestReference(), comparisonObject);
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} does not equal ${comparisonObject}`);
      }
    });
  }

  public toBeTrue() {
    return this.runCheck(() => {
      const result = typeof this.getObjectToTestReference() === 'boolean' && this.getObjectToTestReference() === true;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not true or not of type boolean`);
      }
    });
  }

  public toBeFalse() {
    return this.runCheck(() => {
      const result = typeof this.getObjectToTestReference() === 'boolean' && this.getObjectToTestReference() === false;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not false or not of type boolean`);
      }
    });
  }

  public toBeInstanceOf(classArg: any) {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() instanceof classArg;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not an instance of ${classArg}`);
      }
    });
  }

  public toHaveProperty(propertyArg: string) {
    return this.runCheck(() => {
      const result = !!this.getObjectToTestReference()[propertyArg];
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} does not have property ${propertyArg}`);
      }
    });
  }

  public toBeGreaterThan(numberArg: number) {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() > numberArg;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not greater than ${numberArg}`);
      }
    });
  }

  public toBeLessThan(numberArg: number) {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() < numberArg;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not less than ${numberArg}`);
      }
    });
  }

  public toBeNull() {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() === null;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not null`);
      }
    });
  }

  public toBeUndefined() {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() === undefined;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not undefined`);
      }
    });
  }

  public toBeNullOrUndefined() {
    return this.runCheck(() => {
      const result = this.getObjectToTestReference() === null || this.getObjectToTestReference() === undefined;
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not null or undefined`);
      }
    });
  }

  public toContain(itemArg: any) {
    return this.runCheck(() => {
      const result =
        this.getObjectToTestReference() instanceof Array &&
        this.getObjectToTestReference().includes(itemArg);
      if (!result) {
        throw new Error(`${this.baseReference} with drill down ${this.propertyDrillDown} is not contain ${itemArg}`);
      }
    });
  }

  public property(propertyNameArg: string) {
    this.propertyDrillDown.push(propertyNameArg);
    return this;
  }
}