add tests for layout.showarrow

Author: emilykl

test/jasmine/tests/hover_label_test.js

@@ -7038,3 +7038,100 @@ describe('hover on traces with (x|y)hoverformat', function() {
         .then(done, done.fail);
     });
 });
+
+describe('hoverlabel.showarrow', function() {
+    'use strict';
+
+    var gd;
+
+    beforeEach(function() {
+        gd = createGraphDiv();
+    });
+
+    afterEach(destroyGraphDiv);
+
+    function _hover(x, y) {
+        mouseEvent('mousemove', x, y);
+        Lib.clearThrottle();
+    }
+
+    function getHoverPath() {
+        var hoverLabels = d3SelectAll('g.hovertext');
+        if (hoverLabels.size() === 0) return null;
+        return hoverLabels.select('path').attr('d');
+    }
+
+    it('should show hover arrow by default', function(done) {
+        Plotly.newPlot(gd, [{
+            x: [1, 2, 3],
+            y: [1, 2, 1],
+            type: 'scatter',
+            mode: 'markers'
+        }], {
+            width: 400,
+            height: 400,
+            margin: {l: 50, t: 50, r: 50, b: 50}
+        })
+        .then(function() {
+            _hover(200, 200); // Hover over middle point
+        })
+        .then(delay(HOVERMINTIME * 1.1))
+        .then(function() {
+            var pathD = getHoverPath();
+            expect(pathD).not.toBeNull('hover path should exist');
+            // Arrow paths contain 'L' commands for the triangular pointer
+            expect(pathD).toMatch(/M0,0L/, 'path should contain arrow (L command from origin)');
+        })
+        .then(done, done.fail);
+    });
+
+    it('should hide hover arrow when showarrow is false', function(done) {
+        Plotly.newPlot(gd, [{
+            x: [1, 2, 3],
+            y: [1, 2, 1],
+            type: 'scatter',
+            mode: 'markers'
+        }], {
+            width: 400,
+            height: 400,
+            margin: {l: 50, t: 50, r: 50, b: 50},
+            hoverlabel: { showarrow: false }
+        })
+        .then(function() {
+            _hover(200, 200); // Hover over middle point
+        })
+        .then(delay(HOVERMINTIME * 1.1))
+        .then(function() {
+            var pathD = getHoverPath();
+            expect(pathD).not.toBeNull('hover path should exist');
+            // No-arrow paths should be simple rectangles (no 'L' commands from origin)
+            expect(pathD).not.toMatch(/M0,0L/, 'path should not contain arrow');
+            expect(pathD).toMatch(/^M-/, 'path should start with rectangle (M- for left edge)');
+        })
+        .then(done, done.fail);
+    });
+
+    it('should work at trace level', function(done) {
+        Plotly.newPlot(gd, [{
+            x: [1, 2, 3],
+            y: [1, 2, 1],
+            type: 'scatter',
+            mode: 'markers',
+            hoverlabel: { showarrow: false }
+        }], {
+            width: 400,
+            height: 400,
+            margin: {l: 50, t: 50, r: 50, b: 50}
+        })
+        .then(function() {
+            _hover(200, 200); // Hover over middle point
+        })
+        .then(delay(HOVERMINTIME * 1.1))
+        .then(function() {
+            var pathD = getHoverPath();
+            expect(pathD).not.toBeNull('hover path should exist');
+            expect(pathD).not.toMatch(/M0,0L/, 'trace-level showarrow:false should hide arrow');
+        })
+        .then(done, done.fail);
+    });
+});