basic datum

test/shared/datum.test.ts

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+import { assert } from 'chai';
+
+import qPROJ from 'proj.js';
+import type * as PROJ from 'proj.js';
+
+describe('Datum with automatic import', () => {
+  let PROJ: Awaited<typeof qPROJ>;
+
+  let dbContext: PROJ.DatabaseContext;
+  let authFactory: PROJ.AuthorityFactory;
+  let authFactoryEPSG: PROJ.AuthorityFactory;
+  let crs: PROJ.CRS;
+  let geoCRS: PROJ.GeographicCRS;
+  let datum: PROJ.GeodeticReferenceFrame;
+
+  before('init', async () => {
+    PROJ = await qPROJ;
+    dbContext = PROJ.DatabaseContext.create();
+    authFactory = PROJ.AuthorityFactory.create(dbContext, 'string');
+    authFactoryEPSG = PROJ.AuthorityFactory.create(dbContext, 'EPSG');
+    crs = PROJ.createFromUserInput('+proj=longlat +ellps=GRS80 +pm=paris +geoid_crs=WGS84 +type=crs', dbContext) as PROJ.CRS;
+    geoCRS = crs.extractGeographicCRS();
+    datum = geoCRS.datum();
+  });
+
+  it('Datum', () => {
+    assert.instanceOf(datum, PROJ.Datum);
+  });
+
+  it('Ellipsoid', () => {
+    const ellps = geoCRS.ellipsoid();
+    assert.instanceOf(ellps, PROJ.Ellipsoid);
+    assert.isNumber(ellps.getEPSGCode());
+    assert.instanceOf(ellps.semiMajorAxis(), PROJ.Length);
+    assert.instanceOf(ellps.inverseFlattening(), PROJ.Scale);
+    assert.isNumber(ellps.squaredEccentricity());
+    assert.isString(ellps.celestialBody());
+  })
+});