Add test for gene-shapes

tests/gene-shapes.test.ts

+import { arrowShape } from "../src/scripts/component/sequence/gene-shapes";
+import { scaleLinear } from "d3-scale";
+import { GeneData } from "../src/scripts/types";
+import linearGene from "../src/scripts/layout/linear-gene";
+import { line } from "d3";
+
+
+
+describe("Test gene shapes", () => {
+  const data: GeneData[] = [{
+    name: "gene 1",
+    strand: "-",
+    begin: 10,
+    end: 50,
+    gene: "insA",
+  },
+  {
+    name: "gene 2",
+    strand: "+",
+    begin: 60,
+    end: 90,
+    gene: "yaaY",
+  },
+  {
+    name: "gene 3",
+    strand: "+",
+    begin: 200,
+    end: 228,
+    gene: "bioB",
+  },
+
+  ];
+
+  const pathResults = [
+    "M0,0L0,50L190,50L200,25L190,0Z",
+    "M0,0L0,50L140,50L150,25L140,0Z",
+    "M0,0L0,50L130,50L140,25L130,0Z"
+
+  ];
+
+  const xScale = scaleLinear()
+    .domain([0, 250])
+    .range([0, 1250]);
+
+
+  const linearGeneWithPostion = linearGene(data, xScale);
+  const testsWithResults = linearGeneWithPostion.map((genePostition, i) => {
+    return [arrowShape(genePostition, 50), pathResults[i]];
+  })
+  testsWithResults.forEach(([res, expected], i) => {
+    test("Test Arrow Shape gene " + i, () => {
+      expect(res).toBe(expected);
+    });
+  });
+});
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