Merge pull request #47 from DanielJDufour/GEOTRANS_CHECK

GEOTRANS check

.gitignore

@@ -3,3 +3,6 @@ node_modules
 .DS_STORE
 coverage
 .nyc_output
+*.csv
+*.tgz
+geotrans3.7/

package.json

@@ -6,7 +6,7 @@
   "module": "mgrs.js",
   "scripts": {
     "lint": "eslint mgrs.js && eslint test",
-    "test": "npm run build && nyc mocha",
+    "test": "npm run build && nyc mocha test/test.js",
     "build": "mkdir -p dist && rollup -c"
   },
   "repository": {
@@ -27,6 +27,7 @@
     "chai": "^4.2.0",
     "eslint": "^5.16.0",
     "mocha": "^6.1.1",
+    "node-fetch": "^2.5.0",
     "nyc": "^13.3.0",
     "rollup": "^1.9.0"
   }

test/setup.js

@@ -0,0 +1,36 @@
+const { writeFileSync } = require('fs');
+const fetch = require('node-fetch');
+
+async function process() {
+  // originally downloaded from
+  // http://earth-info.nga.mil/GandG/update/index.php?action=home
+  // and found in the unpacked downloaded GEOTRANS folder at
+  // geotrans3.7/SpreadsheetTester/TestFiles/outputs/output/mgrsToGeo_WE.txt
+  const url = 'https://s3.amazonaws.com/mgrs.io/mgrsToGeo_WE.txt';
+
+  let text = await fetch(url).then(response => response.text());
+
+  const [header, description, blank, ...rows] = text.split('\r\n');
+
+  let testCases = rows
+  .filter(testCase => {
+    return testCase.includes('Successful-Equivalent');
+  })
+  .map(row => {
+    const cells = row.replace(/\t+/g, '\t').split('\t');
+    return {
+      latitude: cells[6].trim(),
+      longitude: cells[7].trim(),
+      mgrs: cells[5].trim()
+    };
+  })
+
+
+  console.log("testCases", testCases);
+  const csv = testCases.map(({mgrs, latitude, longitude}) => `${mgrs}\t${latitude}\t${longitude}`).join('\n');
+  writeFileSync('testing-data.csv', csv, 'utf8');
+
+  console.log("wrote testing-data.csv");
+}
+
+process();

test/test.js

@@ -1,5 +1,6 @@
 const should = require('chai').should(); // eslint-disable-line no-unused-vars
 const mgrs = require('../dist/mgrs');
+const { readFileSync } = require('fs');
 
 describe('First MGRS set', () => {
   const mgrsStr = '33UXP04';
@@ -111,3 +112,23 @@ describe ('data validation', () => {
     });
   });
 });
+
+if (process.env.CHECK_GEOTRANS) {
+  describe('Consistency with GEOTRANS', () => {
+    it('Should be consistent with GEOTRANS', () => {
+      const fileText = readFileSync('./test/testing-data.csv', 'utf8');
+      const lines = fileText.split('\n').filter(Boolean);
+      lines.forEach(line => {
+        const [ mgrsString, expectedLatitude, expectedLongitude ] = line.split('\t');
+        const [ actualLongitude, actualLatitude ] = mgrs.toPoint(mgrsString);
+        try {
+          actualLatitude.should.equal(expectedLatitude);
+          actualLongitude.should.equal(expectedLongitude);
+        } catch (error) {
+          console.error('mgrsString:', mgrsString);
+          throw error;
+        }
+      });
+    });
+  });
+}