easysync tests: Split into multiple files

src/tests/frontend/specs/easysync-inverseRandom.js

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+'use strict';
+
+const Changeset = require('../../../static/js/Changeset');
+const {randomMultiline, randomTestChangeset, poolOrArray} = require('../easysync-helper.js');
+
+describe('easysync-inverseRandom', function () {
+  describe('inverse random', function () {
+    const testInverseRandom = (randomSeed) => {
+      it(`testInverseRandom#${randomSeed}`, async function () {
+        const p = poolOrArray(['apple,', 'apple,true', 'banana,', 'banana,true']);
+
+        const startText = `${randomMultiline(10, 20)}\n`;
+        const alines =
+            Changeset.splitAttributionLines(Changeset.makeAttribution(startText), startText);
+        const lines = startText.slice(0, -1).split('\n').map((s) => `${s}\n`);
+
+        const stylifier = randomTestChangeset(startText, true)[0];
+
+        Changeset.mutateAttributionLines(stylifier, alines, p);
+        Changeset.mutateTextLines(stylifier, lines);
+
+        const changeset = randomTestChangeset(lines.join(''), true)[0];
+        const inverseChangeset = Changeset.inverse(changeset, lines, alines, p);
+
+        const origLines = lines.slice();
+        const origALines = alines.slice();
+
+        Changeset.mutateTextLines(changeset, lines);
+        Changeset.mutateAttributionLines(changeset, alines, p);
+        Changeset.mutateTextLines(inverseChangeset, lines);
+        Changeset.mutateAttributionLines(inverseChangeset, alines, p);
+        expect(lines).to.eql(origLines);
+        expect(alines).to.eql(origALines);
+      });
+    };
+
+    for (let i = 0; i < 30; i++) testInverseRandom(i);
+  });
+
+  describe('inverse', function () {
+    const testInverse = (testId, cs, lines, alines, pool, correctOutput) => {
+      it(`testInverse#${testId}`, async function () {
+        pool = poolOrArray(pool);
+        const str = Changeset.inverse(Changeset.checkRep(cs), lines, alines, pool);
+        expect(str).to.equal(correctOutput);
+      });
+    };
+
+    // take "FFFFTTTTT" and apply "-FT--FFTT", the inverse of which is "--F--TT--"
+    testInverse(1, 'Z:9>0=1*0=1*1=1=2*0=2*1|1=2$', null,
+        ['+4*1+5'], ['bold,', 'bold,true'], 'Z:9>0=2*0=1=2*1=2$');
+  });
+});