Add tests for mask segment view helper

Author: ivmartel

tests/image/maskSegmentViewHelper.test.js

@@ -0,0 +1,90 @@
+import {describe, test, assert, beforeEach} from 'vitest';
+import {
+  MaskSegmentViewHelper
+} from '../../src/image/maskSegmentViewHelper.js';
+
+/**
+ * Tests for the 'image/maskSegmentViewHelper.js' file.
+ */
+
+describe('image', () => {
+
+  let helper;
+
+  beforeEach(() => {
+    helper = new MaskSegmentViewHelper();
+  });
+
+  /**
+   * Tests that isHidden returns false for a segment never added.
+   *
+   * @function module:tests/image~mask-segment-view-helper-is-hidden-initial
+   */
+  test('MaskSegmentViewHelper isHidden returns false initially', () => {
+    assert.notOk(helper.isHidden(1));
+    assert.notOk(helper.isHidden(99));
+  });
+
+  /**
+   * Tests that a segment is hidden after addToHidden.
+   *
+   * @function module:tests/image~mask-segment-view-helper-add-to-hidden
+   */
+  test('MaskSegmentViewHelper addToHidden makes segment hidden', () => {
+    helper.addToHidden(1);
+    assert.ok(helper.isHidden(1), 'hidden after add');
+    assert.notOk(helper.isHidden(2), 'other segments unaffected');
+  });
+
+  /**
+   * Tests that addToHidden is a no-op for an already-hidden segment.
+   *
+   * @function module:tests/image~mask-segment-view-helper-add-duplicate
+   */
+  test('MaskSegmentViewHelper addToHidden ignores duplicate', () => {
+    helper.addToHidden(1);
+    helper.addToHidden(1); // duplicate — should not throw or double-add
+    helper.removeFromHidden(1);
+    assert.notOk(helper.isHidden(1), 'single remove is enough');
+  });
+
+  /**
+   * Tests that removeFromHidden unhides a hidden segment.
+   *
+   * @function module:tests/image~mask-segment-view-helper-remove-from-hidden
+   */
+  test('MaskSegmentViewHelper removeFromHidden unhides a segment', () => {
+    helper.addToHidden(1);
+    helper.addToHidden(2);
+    helper.removeFromHidden(1);
+    assert.notOk(helper.isHidden(1), 'segment 1 removed');
+    assert.ok(helper.isHidden(2), 'segment 2 unaffected');
+  });
+
+  /**
+   * Tests that removeFromHidden is a no-op for a segment not in the list.
+   *
+   * @function module:tests/image~mask-segment-view-helper-remove-unknown
+   */
+  test('MaskSegmentViewHelper removeFromHidden is a no-op for unknown', () => {
+    helper.addToHidden(1);
+    helper.removeFromHidden(99); // no-op
+    assert.ok(helper.isHidden(1), 'existing segment unaffected');
+  });
+
+  /**
+   * Tests that multiple segments can be independently hidden and shown.
+   *
+   * @function module:tests/image~mask-segment-view-helper-multiple
+   */
+  test('MaskSegmentViewHelper manages multiple segments independently', () => {
+    helper.addToHidden(1);
+    helper.addToHidden(2);
+    helper.addToHidden(3);
+    helper.removeFromHidden(2);
+    assert.ok(helper.isHidden(1), 'seg 1 still hidden');
+    assert.notOk(helper.isHidden(2), 'seg 2 removed');
+    assert.ok(helper.isHidden(3), 'seg 3 still hidden');
+  });
+
+});