Adds unit test coverage to some of the workflow output components. Also adds support for hovering on workflow results links to see the edge type (success/fail/always).

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputGraph.jsx

@@ -1,7 +1,10 @@
 import React, { Fragment, useEffect, useRef, useState } from 'react';
 import * as d3 from 'd3';
 import { arrayOf, bool, shape, func } from 'prop-types';
-import { calcZoomAndFit, getZoomTranslate } from '@util/workflow';
+import {
+  getScaleAndOffsetToFit,
+  getTranslatePointsForZoom,
+} from '@util/workflow';
 import {
   WorkflowOutputLink,
   WorkflowOutputNode,
@@ -10,6 +13,7 @@ import {
 import {
   WorkflowHelp,
   WorkflowKey,
+  WorkflowLinkHelp,
   WorkflowNodeHelp,
   WorkflowTools,
 } from '@components/Workflow';
@@ -23,6 +27,7 @@ function WorkflowOutputGraph({
   showKey,
   showTools,
 }) {
+  const [linkHelp, setLinkHelp] = useState();
   const [nodeHelp, setNodeHelp] = useState();
   const [zoomPercentage, setZoomPercentage] = useState(100);
   const svgRef = useRef(null);
@@ -83,7 +88,17 @@ function WorkflowOutputGraph({
   };
 
   const handleZoomChange = newScale => {
-    const [translateX, translateY] = getZoomTranslate(svgRef.current, newScale);
+    const svgElement = document.getElementById('workflow-svg');
+    const svgBoundingClientRect = svgElement.getBoundingClientRect();
+    const currentScaleAndOffset = d3.zoomTransform(
+      d3.select(svgRef.current).node()
+    );
+
+    const [translateX, translateY] = getTranslatePointsForZoom(
+      svgBoundingClientRect,
+      currentScaleAndOffset,
+      newScale
+    );
 
     d3.select(svgRef.current).call(
       zoomRef.transform,
@@ -93,9 +108,27 @@ function WorkflowOutputGraph({
   };
 
   const handleFitGraph = () => {
-    const [scaleToFit, yTranslate] = calcZoomAndFit(
-      gRef.current,
-      svgRef.current
+    const { k: currentScale } = d3.zoomTransform(
+      d3.select(svgRef.current).node()
+    );
+    const gBoundingClientRect = d3
+      .select(gRef.current)
+      .node()
+      .getBoundingClientRect();
+
+    const gBBoxDimensions = d3
+      .select(gRef.current)
+      .node()
+      .getBBox();
+
+    const svgElement = document.getElementById('workflow-svg');
+    const svgBoundingClientRect = svgElement.getBoundingClientRect();
+
+    const [scaleToFit, yTranslate] = getScaleAndOffsetToFit(
+      gBoundingClientRect,
+      svgBoundingClientRect,
+      gBBoxDimensions,
+      currentScale
     );
 
     d3.select(svgRef.current).call(
@@ -118,19 +151,9 @@ function WorkflowOutputGraph({
 
   // Attempt to zoom the graph to fit the available screen space
   useEffect(() => {
-    const [scaleToFit, yTranslate] = calcZoomAndFit(
-      gRef.current,
-      svgRef.current
-    );
-
-    d3.select(svgRef.current).call(
-      zoomRef.transform,
-      d3.zoomIdentity.translate(0, yTranslate).scale(scaleToFit)
-    );
-
-    setZoomPercentage(scaleToFit * 100);
+    handleFitGraph();
     // We only want this to run once (when the component mounts)
-    // Including zoomRef.transform in the deps array will cause this to
+    // Including handleFitGraph in the deps array will cause this to
     // run very frequently.
     // Discussion: https://github.com/facebook/create-react-app/issues/6880
     // and https://github.com/facebook/react/issues/15865 amongst others
@@ -139,9 +162,10 @@ function WorkflowOutputGraph({
 
   return (
     <Fragment>
-      {nodeHelp && (
+      {(nodeHelp || linkHelp) && (
         <WorkflowHelp>
-          <WorkflowNodeHelp node={nodeHelp} />
+          {nodeHelp && <WorkflowNodeHelp node={nodeHelp} />}
+          {linkHelp && <WorkflowLinkHelp link={linkHelp} />}
         </WorkflowHelp>
       )}
       <svg
@@ -160,6 +184,7 @@ function WorkflowOutputGraph({
                 key={`link-${link.source.id}-${link.target.id}`}
                 link={link}
                 nodePositions={nodePositions}
+                onUpdateLinkHelp={setLinkHelp}
               />
             )),
             nodes.map(node => {

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputLink.jsx

@@ -1,11 +1,32 @@
 import React, { useEffect, useState } from 'react';
 import { shape } from 'prop-types';
-import { generateLine, getLinePoints } from '@util/workflow';
+import {
+  generateLine,
+  getLinePoints,
+  getLinkOverlayPoints,
+} from '@util/workflow';
 
-function WorkflowOutputLink({ link, nodePositions }) {
+function WorkflowOutputLink({ link, nodePositions, onUpdateLinkHelp }) {
+  const [hovering, setHovering] = useState(false);
   const [pathD, setPathD] = useState();
   const [pathStroke, setPathStroke] = useState('#CCCCCC');
 
+  const handleLinkMouseEnter = () => {
+    const linkEl = document.getElementById(
+      `link-${link.source.id}-${link.target.id}`
+    );
+    linkEl.parentNode.appendChild(linkEl);
+    setHovering(true);
+  };
+
+  const handleLinkMouseLeave = () => {
+    const linkEl = document.getElementById(
+      `link-${link.source.id}-${link.target.id}`
+    );
+    linkEl.parentNode.prepend(linkEl);
+    setHovering(null);
+  };
+
   useEffect(() => {
     if (link.linkType === 'failure') {
       setPathStroke('#d9534f');
@@ -25,14 +46,22 @@ function WorkflowOutputLink({ link, nodePositions }) {
 
   return (
     <g
-      className="WorkflowGraph-link"
       id={`link-${link.source.id}-${link.target.id}`}
+      onMouseEnter={handleLinkMouseEnter}
+      onMouseLeave={handleLinkMouseLeave}
     >
-      <path
-        className="WorkflowGraph-linkPath"
-        d={pathD}
-        stroke={pathStroke}
-        strokeWidth="2px"
+      <polygon
+        fill="#E1E1E1"
+        id={`link-${link.source.id}-${link.target.id}-overlay`}
+        opacity={hovering ? '1' : '0'}
+        points={getLinkOverlayPoints(link, nodePositions)}
+      />
+      <path d={pathD} stroke={pathStroke} strokeWidth="2px" />
+      <polygon
+        onMouseEnter={() => onUpdateLinkHelp(link)}
+        onMouseLeave={() => onUpdateLinkHelp(null)}
+        opacity="0"
+        points={getLinkOverlayPoints(link, nodePositions)}
       />
     </g>
   );

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputLink.test.jsx

@@ -0,0 +1,42 @@
+import React from 'react';
+import { mountWithContexts } from '@testUtils/enzymeHelpers';
+import WorkflowOutputLink from './WorkflowOutputLink';
+
+const link = {
+  source: {
+    id: 1,
+  },
+  target: {
+    id: 2,
+  },
+};
+
+const nodePositions = {
+  1: {
+    width: 72,
+    height: 40,
+    x: 0,
+    y: 0,
+  },
+  2: {
+    width: 180,
+    height: 60,
+    x: 282,
+    y: 40,
+  },
+};
+
+describe('WorkflowOutputLink', () => {
+  test('mounts successfully', () => {
+    const wrapper = mountWithContexts(
+      <svg>
+        <WorkflowOutputLink
+          link={link}
+          nodePositions={nodePositions}
+          onUpdateLinkHelp={() => {}}
+        />
+      </svg>
+    );
+    expect(wrapper).toHaveLength(1);
+  });
+});

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputNode.jsx

@@ -114,9 +114,7 @@ function WorkflowOutputNode({
                   : i18n._(t`DELETED`)}
               </p>
             </JobTopLine>
-            <Elapsed>
-              <span>{secondsToHHMMSS(node.job.elapsed)}</span>
-            </Elapsed>
+            <Elapsed>{secondsToHHMMSS(node.job.elapsed)}</Elapsed>
           </Fragment>
         ) : (
           <NodeDefaultLabel>

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputNode.test.jsx

@@ -0,0 +1,102 @@
+import React from 'react';
+import { mountWithContexts } from '@testUtils/enzymeHelpers';
+import WorkflowOutputNode from './WorkflowOutputNode';
+
+const nodeWithJT = {
+  id: 2,
+  job: {
+    elapsed: 7,
+    id: 9000,
+    name: 'Automation JT',
+    status: 'successful',
+    type: 'job',
+  },
+  unifiedJobTemplate: {
+    id: 77,
+    name: 'Automation JT',
+    unified_job_type: 'job',
+  },
+};
+
+const nodeWithoutJT = {
+  id: 2,
+  job: {
+    elapsed: 7,
+    id: 9000,
+    name: 'Automation JT',
+    status: 'successful',
+    type: 'job',
+  },
+};
+
+const nodePositions = {
+  1: {
+    width: 72,
+    height: 40,
+    x: 0,
+    y: 0,
+  },
+  2: {
+    width: 180,
+    height: 60,
+    x: 282,
+    y: 40,
+  },
+};
+
+describe('WorkflowOutputNode', () => {
+  test('mounts successfully', () => {
+    const wrapper = mountWithContexts(
+      <svg>
+        <WorkflowOutputNode
+          mouseEnter={() => {}}
+          mouseLeave={() => {}}
+          node={nodeWithJT}
+          nodePositions={nodePositions}
+        />
+      </svg>
+    );
+    expect(wrapper).toHaveLength(1);
+  });
+  test('node contents displayed correctly when Job and Job Template exist', () => {
+    const wrapper = mountWithContexts(
+      <svg>
+        <WorkflowOutputNode
+          mouseEnter={() => {}}
+          mouseLeave={() => {}}
+          node={nodeWithJT}
+          nodePositions={nodePositions}
+        />
+      </svg>
+    );
+    expect(wrapper.contains(<p>Automation JT</p>)).toEqual(true);
+    expect(wrapper.find('WorkflowOutputNode__Elapsed').text()).toBe('00:00:07');
+  });
+  test('node contents displayed correctly when Job Template deleted', () => {
+    const wrapper = mountWithContexts(
+      <svg>
+        <WorkflowOutputNode
+          mouseEnter={() => {}}
+          mouseLeave={() => {}}
+          node={nodeWithoutJT}
+          nodePositions={nodePositions}
+        />
+      </svg>
+    );
+    expect(wrapper.contains(<p>DELETED</p>)).toEqual(true);
+    expect(wrapper.find('WorkflowOutputNode__Elapsed').text()).toBe('00:00:07');
+  });
+  test('node contents displayed correctly when Job deleted', () => {
+    const wrapper = mountWithContexts(
+      <svg>
+        <WorkflowOutputNode
+          mouseEnter={() => {}}
+          mouseLeave={() => {}}
+          node={{ id: 2 }}
+          nodePositions={nodePositions}
+        />
+      </svg>
+    );
+    expect(wrapper.text()).toBe('DELETED');
+  });
+});

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputStartNode.test.jsx

@@ -0,0 +1,21 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import WorkflowOutputStartNode from './WorkflowOutputStartNode';
+
+const nodePositions = {
+  1: {
+    x: 0,
+    y: 0,
+  },
+};
+
+describe('WorkflowOutputStartNode', () => {
+  test('mounts successfully', () => {
+    const wrapper = mount(
+      <svg>
+        <WorkflowOutputStartNode nodePositions={nodePositions} />
+      </svg>
+    );
+    expect(wrapper).toHaveLength(1);
+  });
+});

awx/ui_next/src/screens/Job/WorkflowOutput/WorkflowOutputToolbar.test.jsx

@@ -0,0 +1,51 @@
+import React from 'react';
+import { mountWithContexts } from '@testUtils/enzymeHelpers';
+import WorkflowOutputToolbar from './WorkflowOutputToolbar';
+
+const job = {
+  id: 1,
+  status: 'successful',
+};
+
+describe('WorkflowOutputToolbar', () => {
+  test('mounts successfully', () => {
+    const wrapper = mountWithContexts(
+      <WorkflowOutputToolbar
+        job={job}
+        keyShown={false}
+        nodes={[]}
+        onKeyToggle={() => {}}
+        onToolsToggle={() => {}}
+        toolsShown={false}
+      />
+    );
+    expect(wrapper).toHaveLength(1);
+  });
+
+  test('shows correct number of nodes', () => {
+    const nodes = [
+      {
+        id: 1,
+      },
+      {
+        id: 2,
+      },
+      {
+        id: 3,
+        isDeleted: true,
+      },
+    ];
+    const wrapper = mountWithContexts(
+      <WorkflowOutputToolbar
+        job={job}
+        keyShown={false}
+        nodes={nodes}
+        onKeyToggle={() => {}}
+        onToolsToggle={() => {}}
+        toolsShown={false}
+      />
+    );
+    // The start node (id=1) and deleted nodes (isDeleted=true) should be ignored
+    expect(wrapper.find('Badge').text()).toBe('1');
+  });
+});

awx/ui_next/src/screens/Template/WorkflowJobTemplateVisualizer/VisualizerGraph.jsx

@@ -5,9 +5,9 @@ import styled from 'styled-components';
 import { arrayOf, bool, func, shape } from 'prop-types';
 import * as d3 from 'd3';
 import {
-  calcZoomAndFit,
+  getScaleAndOffsetToFit,
   constants as wfConstants,
-  getZoomTranslate,
+  getTranslatePointsForZoom,
 } from '@util/workflow';
 import {
   WorkflowHelp,
@@ -161,7 +161,17 @@ function VisualizerGraph({
   };
 
   const handleZoomChange = newScale => {
-    const [translateX, translateY] = getZoomTranslate(svgRef.current, newScale);
+    const svgElement = document.getElementById('workflow-svg');
+    const svgBoundingClientRect = svgElement.getBoundingClientRect();
+    const currentScaleAndOffset = d3.zoomTransform(
+      d3.select(svgRef.current).node()
+    );
+
+    const [translateX, translateY] = getTranslatePointsForZoom(
+      svgBoundingClientRect,
+      currentScaleAndOffset,
+      newScale
+    );
 
     d3.select(svgRef.current).call(
       zoomRef.transform,
@@ -171,9 +181,27 @@ function VisualizerGraph({
   };
 
   const handleFitGraph = () => {
-    const [scaleToFit, yTranslate] = calcZoomAndFit(
-      gRef.current,
-      svgRef.current
+    const { k: currentScale } = d3.zoomTransform(
+      d3.select(svgRef.current).node()
+    );
+    const gBoundingClientRect = d3
+      .select(gRef.current)
+      .node()
+      .getBoundingClientRect();
+
+    const gBBoxDimensions = d3
+      .select(gRef.current)
+      .node()
+      .getBBox();
+
+    const svgElement = document.getElementById('workflow-svg');
+    const svgBoundingClientRect = svgElement.getBoundingClientRect();
+
+    const [scaleToFit, yTranslate] = getScaleAndOffsetToFit(
+      gBoundingClientRect,
+      svgBoundingClientRect,
+      gBBoxDimensions,
+      currentScale
     );
 
     d3.select(svgRef.current).call(
@@ -196,19 +224,9 @@ function VisualizerGraph({
 
   // Attempt to zoom the graph to fit the available screen space
   useEffect(() => {
-    const [scaleToFit, yTranslate] = calcZoomAndFit(
-      gRef.current,
-      svgRef.current
-    );
-
-    d3.select(svgRef.current).call(
-      zoomRef.transform,
-      d3.zoomIdentity.translate(0, yTranslate).scale(scaleToFit)
-    );
-
-    setZoomPercentage(scaleToFit * 100);
+    handleFitGraph();
     // We only want this to run once (when the component mounts)
-    // Including zoomRef.transform in the deps array will cause this to
+    // Including handleFitGraph in the deps array will cause this to
     // run very frequently.
     // Discussion: https://github.com/facebook/create-react-app/issues/6880
     // and https://github.com/facebook/react/issues/15865 amongst others

awx/ui_next/src/screens/Template/WorkflowJobTemplateVisualizer/VisualizerLink.jsx

@@ -116,7 +116,6 @@ function VisualizerLink({
 
   return (
     <LinkG
-      className="WorkflowGraph-link"
       id={`link-${link.source.id}-${link.target.id}`}
       ignorePointerEvents={addingLink}
       onMouseEnter={handleLinkMouseEnter}
@@ -128,12 +127,7 @@ function VisualizerLink({
         opacity={hovering ? '1' : '0'}
         points={getLinkOverlayPoints(link, nodePositions)}
       />
-      <path
-        className="WorkflowGraph-linkPath"
-        d={pathD}
-        stroke={pathStroke}
-        strokeWidth="2px"
-      />
+      <path d={pathD} stroke={pathStroke} strokeWidth="2px" />
       <polygon
         onMouseEnter={() => onUpdateLinkHelp(link)}
         onMouseLeave={() => onUpdateLinkHelp(null)}

awx/ui_next/src/util/workflow.jsx

@@ -11,24 +11,15 @@ export const constants = {
   rootH: 40,
 };
 
-export function calcZoomAndFit(gRef, svgRef) {
-  const { k: currentScale } = d3.zoomTransform(d3.select(svgRef).node());
-  const gBoundingClientRect = d3
-    .select(gRef)
-    .node()
-    .getBoundingClientRect();
-
+export function getScaleAndOffsetToFit(
+  gBoundingClientRect,
+  svgBoundingClientRect,
+  gBBoxDimensions,
+  currentScale
+) {
   gBoundingClientRect.height /= currentScale;
   gBoundingClientRect.width /= currentScale;
 
-  const gBBoxDimensions = d3
-    .select(gRef)
-    .node()
-    .getBBox();
-
-  const svgElement = document.getElementById('workflow-svg');
-  const svgBoundingClientRect = svgElement.getBoundingClientRect();
-
   // For some reason the root width needs to be added?
   gBoundingClientRect.width += constants.rootW;
 
@@ -96,19 +87,19 @@ export function getLinePoints(link, nodePositions) {
   ];
 }
 
-export function getLinkOverlayPoints(d, nodePositions) {
+export function getLinkOverlayPoints(link, nodePositions) {
   const sourceX =
-    nodePositions[d.source.id].x + nodePositions[d.source.id].width + 1;
+    nodePositions[link.source.id].x + nodePositions[link.source.id].width + 1;
   let sourceY =
-    normalizeY(nodePositions, nodePositions[d.source.id].y) +
-    nodePositions[d.source.id].height / 2;
-  const targetX = nodePositions[d.target.id].x - 1;
+    normalizeY(nodePositions, nodePositions[link.source.id].y) +
+    nodePositions[link.source.id].height / 2;
+  const targetX = nodePositions[link.target.id].x - 1;
   const targetY =
-    normalizeY(nodePositions, nodePositions[d.target.id].y) +
-    nodePositions[d.target.id].height / 2;
+    normalizeY(nodePositions, nodePositions[link.target.id].y) +
+    nodePositions[link.target.id].height / 2;
 
   // There's something off with the math on the root node...
-  if (d.source.id === 1) {
+  if (link.source.id === 1) {
     sourceY += 10;
   }
   const slope = (targetY - sourceY) / (targetX - sourceX);
@@ -177,18 +168,19 @@ export function layoutGraph(nodes, links) {
   return g;
 }
 
-export function getZoomTranslate(svgRef, newScale) {
-  const svgElement = document.getElementById('workflow-svg');
-  const svgBoundingClientRect = svgElement.getBoundingClientRect();
-  const current = d3.zoomTransform(d3.select(svgRef).node());
-  const origScale = current.k;
+export function getTranslatePointsForZoom(
+  svgBoundingClientRect,
+  currentScaleAndOffset,
+  newScale
+) {
+  const origScale = currentScaleAndOffset.k;
   const unscaledOffsetX =
-    (current.x +
+    (currentScaleAndOffset.x +
       (svgBoundingClientRect.width * origScale - svgBoundingClientRect.width) /
         2) /
     origScale;
   const unscaledOffsetY =
-    (current.y +
+    (currentScaleAndOffset.y +
       (svgBoundingClientRect.height * origScale -
         svgBoundingClientRect.height) /
         2) /

awx/ui_next/src/util/workflow.test.jsx

@@ -0,0 +1,225 @@
+import {
+  getScaleAndOffsetToFit,
+  generateLine,
+  getLinePoints,
+  getLinkOverlayPoints,
+  layoutGraph,
+  getTranslatePointsForZoom,
+} from './workflow';
+
+describe('getScaleAndOffsetToFit', () => {
+  const gBoundingClientRect = {
+    x: 36,
+    y: 11,
+    width: 798,
+    height: 160,
+    top: 11,
+    right: 834,
+    bottom: 171,
+    left: 36,
+  };
+  const svgBoundingClientRect = {
+    x: 0,
+    y: 56,
+    width: 1680,
+    height: 455,
+    top: 56,
+    right: 1680,
+    bottom: 511,
+    left: 0,
+  };
+  const gBBoxDimensions = {
+    x: 36,
+    y: -45,
+    width: 726,
+    height: 160,
+  };
+  const currentScale = 1;
+  test('returns correct scale and y-offset for zooming the graph to best fit the available space', () => {
+    expect(
+      getScaleAndOffsetToFit(
+        gBoundingClientRect,
+        svgBoundingClientRect,
+        gBBoxDimensions,
+        currentScale
+      )
+    ).toEqual([1.931, 159.91499999999996]);
+  });
+});
+
+describe('generateLine', () => {
+  test('returns correct svg path string', () => {
+    expect(
+      generateLine([
+        {
+          x: 0,
+          y: 0,
+        },
+        {
+          x: 10,
+          y: 10,
+        },
+      ])
+    ).toEqual('M0,0L10,10');
+    expect(
+      generateLine([
+        {
+          x: 900,
+          y: 44,
+        },
+        {
+          x: 5000,
+          y: 359,
+        },
+      ])
+    ).toEqual('M900,44L5000,359');
+  });
+});
+
+describe('getLinePoints', () => {
+  const link = {
+    source: {
+      id: 1,
+    },
+    target: {
+      id: 2,
+    },
+  };
+  const nodePositions = {
+    1: {
+      width: 72,
+      height: 40,
+      x: 36,
+      y: 130,
+    },
+    2: {
+      width: 180,
+      height: 60,
+      x: 282,
+      y: 40,
+    },
+  };
+  test('returns the correct endpoints of the line', () => {
+    expect(getLinePoints(link, nodePositions)).toEqual([
+      { x: 109, y: 30 },
+      { x: 281, y: -60 },
+    ]);
+  });
+});
+
+describe('getLinkOverlayPoints', () => {
+  const link = {
+    source: {
+      id: 1,
+    },
+    target: {
+      id: 2,
+    },
+  };
+  const nodePositions = {
+    1: {
+      width: 72,
+      height: 40,
+      x: 36,
+      y: 130,
+    },
+    2: {
+      width: 180,
+      height: 60,
+      x: 282,
+      y: 40,
+    },
+  };
+  test('returns the four points of the polygon that will act as the overlay for the link', () => {
+    expect(getLinkOverlayPoints(link, nodePositions)).toEqual(
+      '281,-50.970992003685446 109,39.02900799631457 109,20.97099200368546 281,-69.02900799631456'
+    );
+  });
+});
+
+describe('layoutGraph', () => {
+  const nodes = [
+    {
+      id: 1,
+    },
+    {
+      id: 2,
+    },
+    {
+      id: 3,
+    },
+    {
+      id: 4,
+    },
+  ];
+  const links = [
+    {
+      source: {
+        id: 1,
+      },
+      target: {
+        id: 2,
+      },
+    },
+    {
+      source: {
+        id: 1,
+      },
+      target: {
+        id: 4,
+      },
+    },
+    {
+      source: {
+        id: 2,
+      },
+      target: {
+        id: 3,
+      },
+    },
+    {
+      source: {
+        id: 4,
+      },
+      target: {
+        id: 3,
+      },
+    },
+  ];
+  test('returns the correct dimensions and positions for the nodes', () => {
+    expect(layoutGraph(nodes, links)._nodes).toEqual({
+      1: { height: 40, label: '', width: 72, x: 36, y: 75 },
+      2: { height: 60, label: '', width: 180, x: 282, y: 30 },
+      3: { height: 60, label: '', width: 180, x: 582, y: 75 },
+      4: { height: 60, label: '', width: 180, x: 282, y: 120 },
+    });
+  });
+});
+
+describe('getTranslatePointsForZoom', () => {
+  const svgBoundingClientRect = {
+    x: 0,
+    y: 56,
+    width: 1680,
+    height: 455,
+    top: 56,
+    right: 1680,
+    bottom: 511,
+    left: 0,
+  };
+  const currentScaleAndOffset = {
+    k: 2,
+    x: 0,
+    y: 167.5,
+  };
+  const newScale = 1.9;
+  test('returns the correct translation point', () => {
+    expect(
+      getTranslatePointsForZoom(
+        svgBoundingClientRect,
+        currentScaleAndOffset,
+        newScale
+      )
+    ).toEqual([42, 170.5]);
+  });
+});