JS test framework for node layout

client/app/scripts/charts/__tests__/node-layout-test.js

@@ -0,0 +1,50 @@
+jest.dontMock('../nodes-layout');
+jest.dontMock('../../constants/naming'); // edge naming: 'source-target'
+
+describe('NodesLayout', () => {
+  const NodesLayout = require('../nodes-layout');
+
+  function scale(val) {
+    return val * 3;
+  }
+  const topologyId = 'tid';
+  const width = 80;
+  const height = 80;
+  const margins = {
+    left: 0,
+    top: 0
+  };
+
+  const nodeSets = {
+    initial4: {
+      nodes: {
+        n1: {id: 'n1'},
+        n2: {id: 'n2'},
+        n3: {id: 'n3'},
+        n4: {id: 'n4'}
+      },
+      edges: {
+        'n1-n3': {id: 'n1-n3', source: {id: 'n1'}, target: {id: 'n3'}},
+        'n1-n4': {id: 'n1-n4', source: {id: 'n1'}, target: {id: 'n4'}},
+        'n2-n4': {id: 'n2-n4', source: {id: 'n2'}, target: {id: 'n4'}}
+      }
+    }
+  };
+
+  it('lays out initial nodeset', () => {
+    const nodes = nodeSets.initial4.nodes;
+    const edges = nodeSets.initial4.edges;
+    NodesLayout.doLayout(nodes, edges, width, height, scale, margins, topologyId);
+    expect(nodes.n1.x).toBeLessThan(nodes.n2.x);
+    expect(nodes.n1.y).toEqual(nodes.n2.y);
+
+    expect(nodes.n1.x).toEqual(nodes.n3.x);
+    expect(nodes.n1.y).toBeLessThan(nodes.n3.y);
+
+    expect(nodes.n3.x).toBeLessThan(nodes.n4.x);
+    expect(nodes.n3.y).toEqual(nodes.n4.y);
+
+    console.log(nodes, nodeSets.initial4.nodes);
+  });
+
+});

client/package.json

@@ -78,6 +78,7 @@
       "react",
       "immutable",
       "d3",
+      "dagre",
       "keymirror",
       "object-assign",
       "lodash",