From 73d3507f066b3f8543b548b7ac1a0388cacca2ca Mon Sep 17 00:00:00 2001
From: svonderohe <spencer.vonderohe@trustscience.com>
Date: Thu, 5 Dec 2024 08:45:58 -0700
Subject: [PATCH 1/2] Fix "Cannot set properties of null (setting
 'hoverState')"

---
 src/chart/line/LineView.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/chart/line/LineView.ts b/src/chart/line/LineView.ts
index deebe66e22..18b49f81a8 100644
--- a/src/chart/line/LineView.ts
+++ b/src/chart/line/LineView.ts
@@ -1031,7 +1031,6 @@ class LineView extends ChartView {
 
     _changePolyState(toState: DisplayState) {
         const polygon = this._polygon;
-        setStatesFlag(this._polyline, toState);
         polygon && setStatesFlag(polygon, toState);
     }
 

From b9614d46fcce8f58f04802e357175caad0a3d2c3 Mon Sep 17 00:00:00 2001
From: svonderohe <spencer.vonderohe@trustscience.com>
Date: Fri, 6 Dec 2024 08:51:16 -0700
Subject: [PATCH 2/2] Add tests for _changePolyState change

---
 test/ut/jest.config.cjs                  |  1 +
 test/ut/spec/chart/line/LineView.test.ts | 26 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 test/ut/spec/chart/line/LineView.test.ts

diff --git a/test/ut/jest.config.cjs b/test/ut/jest.config.cjs
index 5ca8031953..dd20b717d6 100644
--- a/test/ut/jest.config.cjs
+++ b/test/ut/jest.config.cjs
@@ -42,6 +42,7 @@ module.exports = {
     testMatch: [
         '**/spec/api/*.test.ts',
         '**/spec/component/**/*.test.ts',
+        '**/spec/chart/**/*.test.ts',
         '**/spec/series/**/*.test.ts',
         '**/spec/data/*.test.ts',
         '**/spec/model/*.test.ts',
diff --git a/test/ut/spec/chart/line/LineView.test.ts b/test/ut/spec/chart/line/LineView.test.ts
new file mode 100644
index 0000000000..d7e77585fe
--- /dev/null
+++ b/test/ut/spec/chart/line/LineView.test.ts
@@ -0,0 +1,26 @@
+import LineView from "@/src/chart/line/LineView";
+import { HOVER_STATE_EMPHASIS } from "@/src/util/states";
+import { ECElement } from "@/src/util/types";
+
+describe('LineView', function () {
+
+    let lineView: LineView;
+    beforeEach(function () {
+        lineView = new LineView();
+        lineView.init();
+    });
+
+    it('should change poly state when polygon is set', function () {
+        lineView._polygon = lineView._newPolygon(
+            [], [],
+        );
+        lineView._changePolyState('emphasis');
+        expect((lineView._polygon as ECElement).hoverState).toBe(HOVER_STATE_EMPHASIS);
+    });
+
+    it('should not error on state change when polygon is not set', function () {
+        lineView._polygon = null;
+        expect(() => lineView._changePolyState('emphasis')).not.toThrow();
+    });
+
+});