Added tests

packages/polaris-viz/src/components/StackedAreaChart/utilities/tests/getAlteredStackedAreaChartPosition.test.ts

@@ -0,0 +1,80 @@
+import type {AlteredPositionProps} from '../../../TooltipWrapper';
+import {
+  TooltipVerticalOffset,
+  TooltipHorizontalOffset,
+} from '../../../TooltipWrapper';
+import {getAlteredStackedAreaChartPosition} from '../getAlteredStackedAreaChartPosition';
+
+const MARGIN = {Top: 0, Left: 0, Right: 0, Bottom: 0};
+const TOOLTIP_MARGIN = 20;
+
+const BASE_PROPS: AlteredPositionProps = {
+  isPerformanceImpacted: false,
+  chartBounds: {height: 100, width: 200, x: 0, y: 100},
+  tooltipDimensions: {height: 40, width: 60},
+  margin: MARGIN,
+  bandwidth: 40,
+  currentX: 20,
+  currentY: 0,
+  position: {
+    horizontal: TooltipHorizontalOffset.Left,
+    vertical: TooltipVerticalOffset.Center,
+  },
+};
+
+describe('getAlteredStackedAreaChartPosition', () => {
+  it('returns the original position of y when currentY is within the chart bounds', () => {
+    const props = {
+      ...BASE_PROPS,
+      currentX: 50,
+      currentY: 50,
+    };
+
+    const result = getAlteredStackedAreaChartPosition(props);
+
+    expect(result.x).toBe(50);
+    expect(result.y).toBe(50);
+  });
+
+  it('returns the adjusted position when currentY is greater than chartBounds.y + chartBounds.height', () => {
+    const props = {
+      ...BASE_PROPS,
+      currentY: 300,
+    };
+
+    const chartBounds = props.chartBounds;
+    const tooltipDimensions = props.tooltipDimensions;
+    const margin = props.margin;
+    const result = getAlteredStackedAreaChartPosition(props);
+
+    expect(result.x).toBe(20);
+
+    expect(result.y).toBe(
+      chartBounds.height -
+        tooltipDimensions.height -
+        TOOLTIP_MARGIN -
+        margin.Bottom,
+    );
+  });
+
+  it('returns the adjusted position when currentY is equal to chartBounds.y + chartBounds.height', () => {
+    const props = {
+      ...BASE_PROPS,
+      currentY: 200,
+    };
+
+    const chartBounds = props.chartBounds;
+    const tooltipDimensions = props.tooltipDimensions;
+    const margin = props.margin;
+    const result = getAlteredStackedAreaChartPosition(props);
+
+    expect(result.x).toBe(20);
+
+    expect(result.y).toBe(
+      chartBounds.height -
+        tooltipDimensions.height -
+        TOOLTIP_MARGIN -
+        margin.Bottom,
+    );
+  });
+});