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test/mouse.test.js

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+'use strict';
+
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import {
+    wheelDeltaFromInput,
+    containsMouseSequence,
+    stripMouseSequences,
+} from '../src/ui/mouse.js';
+
+test('decodes SGR wheel direction', () => {
+    assert.equal(wheelDeltaFromInput('\x1b[<64;88;20M'), -1);
+    assert.equal(wheelDeltaFromInput('[<65;88;20M'), 1);
+    // Some terminals add modifier bits to the button code.
+    assert.equal(wheelDeltaFromInput('[<96;88;20M'), -1);
+    assert.equal(wheelDeltaFromInput('[<97;88;20M'), 1);
+});
+
+test('ignores non-wheel and incomplete mouse input', () => {
+    assert.equal(wheelDeltaFromInput('[<0;1;1M'), 0);
+    assert.equal(wheelDeltaFromInput('[<64;1;1'), 0);
+    assert.equal(wheelDeltaFromInput('hello'), 0);
+});
+
+test('removes mouse reports without dropping surrounding text', () => {
+    const value = 'before\x1b[<65;88;20Mafter';
+    assert.equal(containsMouseSequence(value), true);
+    assert.equal(stripMouseSequences(value), 'beforeafter');
+    assert.equal(stripMouseSequences('plain text'), 'plain text');
+});