updating gitignore, adding test file

.gitignore

@@ -0,0 +1,6 @@
+.git/
+node_modules/
+stats.json
+bundle.js
+.DS_Store
+npm-debug.log

prepareCircularViewData.test.js

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+var prepareCircularViewData = require('./prepareCircularViewData');
+var expect = require('chai').expect;
+var mapAnnotationsToRows = require('./mapAnnotationsToRows.js');
+describe('prepareCircularViewData', function() {
+    it('maps overlapping annotations to rows correctly', function() {
+        var annotation1 = {
+            start: 0,
+            end: 9,
+            id: 'a'
+        };
+        var annotation2 = {
+            start: 0,
+            end: 9,
+            id: 'b'
+        };
+        var annotations = [annotation1, annotation2];
+        var sequenceLength = 10;
+        var bpsPerRow = 5;
+        var annotationsToRowsMap = mapAnnotationsToRows(annotations, sequenceLength, bpsPerRow);
+        expect(annotationsToRowsMap).to.deep.equal({
+            0: [{
+                annotation: annotation1,
+                start: 0,
+                end: 4,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "beginningAndEnd"
+            },{
+                start: 0,
+                end: 4,
+                id: annotation2.id,
+                yOffset: 1,
+                annotation: annotation2,
+                enclosingRangeType: "beginningAndEnd"
+            }],
+            1: [{
+                annotation: annotation1,
+                start: 5,
+                end: 9,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "beginningAndEnd"
+            },{
+                start: 5,
+                end: 9,
+                id: annotation2.id,
+                yOffset: 1,
+                annotation: annotation2,
+                enclosingRangeType: "beginningAndEnd"
+            }]
+        });
+    });
+    it('correctly calculates y-offset for annotation split by origin', function() {
+        var annotation1 = {
+            start: 7,
+            end: 9,
+            id: 'a'
+        };
+        var annotation2 = {
+            start: 5,
+            end: 3,
+            id: 'b'
+        };
+        var annotations = [annotation1, annotation2];
+        var sequenceLength = 10;
+        var bpsPerRow = 10;
+        var annotationsToRowsMap = mapAnnotationsToRows(annotations, sequenceLength, bpsPerRow);
+        expect(annotationsToRowsMap).to.deep.equal({
+            0: [{
+                start: 7,
+                end: 9,
+                id: annotation1.id,
+                yOffset: 0,
+                annotation: annotation1,
+                enclosingRangeType: "beginningAndEnd"
+            },{
+                annotation: annotation2,
+                start: 0,
+                end: 3,
+                id: annotation2.id,
+                yOffset: 1,
+                enclosingRangeType: "end"
+            },{
+                annotation: annotation2,
+                start: 5,
+                end: 9,
+                id: annotation2.id,
+                yOffset: 1,
+                enclosingRangeType: "beginning"
+            },]
+        });
+    });
+    it('correctly calculates y-offset for annotation split by origin (different ordering of annotations)', function() {
+        var annotation1 = {
+            start: 5,
+            end: 3,
+            id: 'a'
+        };
+        var annotation2 = {
+            start: 7,
+            end: 9,
+            id: 'b'
+        };
+        var annotations = [annotation1, annotation2];
+        var sequenceLength = 10;
+        var bpsPerRow = 10;
+        var annotationsToRowsMap = mapAnnotationsToRows(annotations, sequenceLength, bpsPerRow);
+        expect(annotationsToRowsMap).to.deep.equal({
+            0: [{
+                annotation: annotation1,
+                start: 0,
+                end: 3,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "end"
+            },{
+                annotation: annotation1,
+                start: 5,
+                end: 9,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "beginning"
+            },{
+                start: 7,
+                end: 9,
+                id: annotation2.id,
+                yOffset: 1,
+                annotation: annotation2,
+                enclosingRangeType: "beginningAndEnd"
+            }]
+        });
+    });
+
+    it('maps single annotation to rows correctly', function() {
+        var annotation1 = {
+            start: 0,
+            end: 9,
+            id: 'a'
+        };
+        var annotations = [annotation1];
+        var sequenceLength = 10;
+        var bpsPerRow = 5;
+        var annotationsToRowsMap = mapAnnotationsToRows(annotations, sequenceLength, bpsPerRow);
+        expect(annotationsToRowsMap).to.deep.equal({
+            0: [{
+                annotation: annotation1,
+                start: 0,
+                end: 4,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "beginningAndEnd"
+            }],
+            1: [{
+                annotation: annotation1,
+                start: 5,
+                end: 9,
+                id: annotation1.id,
+                yOffset: 0,
+                enclosingRangeType: "beginningAndEnd"
+            }]
+        });
+    });
+});