How to use the react-map-gl/utils/map-state function in react-map-gl

.zoom({pos: POS_IMTERMIDIATE, scale: 1.5})
      .zoom({pos: POS_END, scale: SCALE})
      .zoomEnd()
      .getViewportProps();

    t.ok(
      toLowPrecision(viewport1.longitude) === toLowPrecision(viewport2.longitude) &&
        toLowPrecision(viewport1.latitude) === toLowPrecision(viewport2.latitude) &&
        toLowPrecision(viewport1.zoom) === toLowPrecision(viewport2.zoom),
      'Consistent result'
    );
  });

  // argument out of bounds
  try {
    new MapState(SAMPLE_VIEWPORTS[0]).zoom({pos: POS_END, scale: -1});
    t.fail('Should throw error with out of bounds argument');
  } catch (error) {
    t.ok(/scale/.test(error.message), 'Should throw error with out of bounds argument');
  }

  t.end();
});

test('MapState - Constructor', t => {
  SAMPLE_VIEWPORTS.forEach(viewport => {
    t.ok(new MapState(viewport), 'Constructed MapState instance');
  });

  // Normalize props
  {
    const mapState = new MapState(Object.assign({}, SAMPLE_VIEWPORTS[0], {longitude: -200}));
    t.is(mapState.getViewportProps().longitude, 160, 'Normalized props');
  }

  // Missing required prop
  try {
    t.notOk(new MapState({width: 100, height: 100}), 'Should throw error for missing prop');
  } catch (error) {
    t.ok(/must be supplied/.test(error.message), 'Should throw error for missing prop');
  }

  t.end();
});

test('MapState - Constructor', t => {
  SAMPLE_VIEWPORTS.forEach(viewport => {
    t.ok(new MapState(viewport), 'Constructed MapState instance');
  });

  // Normalize props
  {
    const mapState = new MapState(Object.assign({}, SAMPLE_VIEWPORTS[0], {longitude: -200}));
    t.is(mapState.getViewportProps().longitude, 160, 'Normalized props');
  }

  // Missing required prop
  try {
    t.notOk(new MapState({width: 100, height: 100}), 'Should throw error for missing prop');
  } catch (error) {
    t.ok(/must be supplied/.test(error.message), 'Should throw error for missing prop');
  }

  t.end();
});

t.ok(toLowPrecision(viewport1.zoom) !== toLowPrecision(viewport.zoom), 'Zoom has changed');
    t.ok(
      viewport1.zoom <= viewport1.maxZoom && viewport1.zoom >= viewport1.minZoom,
      'Zoom is within bounds'
    );
    t.ok(
      isSameLocation(
        new WebMercatorViewport(viewport).unproject(POS_START),
        new WebMercatorViewport(viewport1).unproject(POS_END)
      ),
      'Location under the pointer remains the same'
    );

    // chained panning
    const viewport2 = new MapState(viewport)
      .zoomStart({pos: POS_START})
      .zoom({pos: POS_IMTERMIDIATE, scale: 1.5})
      .zoom({pos: POS_END, scale: SCALE})
      .zoomEnd()
      .getViewportProps();

    t.ok(
      toLowPrecision(viewport1.longitude) === toLowPrecision(viewport2.longitude) &&
        toLowPrecision(viewport1.latitude) === toLowPrecision(viewport2.latitude) &&
        toLowPrecision(viewport1.zoom) === toLowPrecision(viewport2.zoom),
      'Consistent result'
    );
  });

SAMPLE_VIEWPORTS.forEach(viewport => {
    // one-off panning
    const viewport1 = new MapState(viewport)
      .zoom({pos: POS_END, startPos: POS_START, scale: SCALE})
      .getViewportProps();

    t.ok(toLowPrecision(viewport1.zoom) !== toLowPrecision(viewport.zoom), 'Zoom has changed');
    t.ok(
      viewport1.zoom <= viewport1.maxZoom && viewport1.zoom >= viewport1.minZoom,
      'Zoom is within bounds'
    );
    t.ok(
      isSameLocation(
        new WebMercatorViewport(viewport).unproject(POS_START),
        new WebMercatorViewport(viewport1).unproject(POS_END)
      ),
      'Location under the pointer remains the same'
    );

SAMPLE_VIEWPORTS.forEach(viewport => {
    // one-off panning
    const viewport1 = new MapState(viewport)
      .pan({pos: POS_END, startPos: POS_START})
      .getViewportProps();

    t.ok(
      toLowPrecision(viewport1.longitude) !== toLowPrecision(viewport.longitude) ||
        toLowPrecision(viewport1.latitude) !== toLowPrecision(viewport.latitude),
      'Map center has changed'
    );
    t.ok(viewport1.longitude < 180 && viewport1.longitude >= -180, 'Longitude is within bounds');
    t.ok(viewport1.latitude <= 90 && viewport1.latitude >= -90, 'Latitude is within bounds');
    t.ok(
      isSameLocation(
        new WebMercatorViewport(viewport).unproject(POS_START),
        new WebMercatorViewport(viewport1).unproject(POS_END)
      ),
      'Location under the pointer remains the same'

// chained rotating
    const viewport2 = new MapState(viewport)
      .rotateStart({})
      .rotate({deltaScaleX: 0, deltaScaleY: 0})
      .rotate({deltaScaleX: X_DELTA, deltaScaleY: Y_DELTA})
      .rotateEnd()
      .getViewportProps();

    t.ok(
      toLowPrecision(viewport1.pitch) === toLowPrecision(viewport2.pitch) &&
        toLowPrecision(viewport1.bearing) === toLowPrecision(viewport2.bearing),
      'Consistent result'
    );

    // out of bounds arguments
    const state = new MapState(viewport).rotateStart({});

    t.is(
      state.rotate({deltaScaleY: 2}).getViewportProps().pitch,
      viewport.maxPitch || MAPBOX_LIMITS.maxPitch,
      'Capped at max pitch'
    );

    t.is(
      state.rotate({deltaScaleY: -2}).getViewportProps().pitch,
      viewport.minPitch || MAPBOX_LIMITS.minPitch,
      'Capped at min pitch'
    );

    t.is(
      state.rotate({deltaScaleX: 2}).getViewportProps().bearing,
      viewport.bearing || 0,

toLowPrecision(viewport1.longitude) !== toLowPrecision(viewport.longitude) ||
        toLowPrecision(viewport1.latitude) !== toLowPrecision(viewport.latitude),
      'Map center has changed'
    );
    t.ok(viewport1.longitude < 180 && viewport1.longitude >= -180, 'Longitude is within bounds');
    t.ok(viewport1.latitude <= 90 && viewport1.latitude >= -90, 'Latitude is within bounds');
    t.ok(
      isSameLocation(
        new WebMercatorViewport(viewport).unproject(POS_START),
        new WebMercatorViewport(viewport1).unproject(POS_END)
      ),
      'Location under the pointer remains the same'
    );

    // chained panning
    const viewport2 = new MapState(viewport)
      .panStart({pos: POS_START})
      .pan({pos: POS_IMTERMIDIATE})
      .pan({pos: POS_END})
      .panEnd()
      .getViewportProps();

    t.ok(
      toLowPrecision(viewport1.longitude) === toLowPrecision(viewport2.longitude) &&
        toLowPrecision(viewport1.latitude) === toLowPrecision(viewport2.latitude),
      'Consistent result'
    );
  });

test('MapState - Low zoom', t => {
  const viewport = new MapState({
    width: 800,
    height: 600,
    longitude: -179,
    latitude: 80,
    zoom: 0,
    maxZoom: 0.5
  }).getViewportProps();

  t.ok(viewport.zoom > 0, 'Constrained zoom');
  t.ok(Math.abs(viewport.latitude) < 1e-7, 'Centered map');

  t.end();
});

SAMPLE_VIEWPORTS.forEach(viewport => {
    t.ok(new MapState(viewport), 'Constructed MapState instance');
  });