Add unit tests.

public/app/plugins/panel/graph/specs/align_y.jest.ts

@@ -0,0 +1,167 @@
+import { alignYLevel } from '../align_yaxes';
+
+describe('Graph Y axes aligner', function() {
+  let yaxes, expected;
+  let alignY = 0;
+
+  describe('on the one hand with respect to zero', () => {
+    it('Should shrink Y axis', () => {
+      yaxes = [{ min: 5, max: 10 }, { min: 2, max: 3 }];
+      expected = [{ min: 5, max: 10 }, { min: 1.5, max: 3 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axis', () => {
+      yaxes = [{ min: 2, max: 3 }, { min: 5, max: 10 }];
+      expected = [{ min: 1.5, max: 3 }, { min: 5, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axis', () => {
+      yaxes = [{ min: -10, max: -5 }, { min: -3, max: -2 }];
+      expected = [{ min: -10, max: -5 }, { min: -3, max: -1.5 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axis', () => {
+      yaxes = [{ min: -3, max: -2 }, { min: -10, max: -5 }];
+      expected = [{ min: -3, max: -1.5 }, { min: -10, max: -5 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+
+  describe('on the opposite sides with respect to zero', () => {
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -3, max: -1 }, { min: 5, max: 10 }];
+      expected = [{ min: -3, max: 3 }, { min: -10, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: 1, max: 3 }, { min: -10, max: -5 }];
+      expected = [{ min: -3, max: 3 }, { min: -10, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+
+  describe('both across zero', () => {
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -10, max: 5 }, { min: -2, max: 3 }];
+      expected = [{ min: -10, max: 15 }, { min: -2, max: 3 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -5, max: 10 }, { min: -3, max: 2 }];
+      expected = [{ min: -15, max: 10 }, { min: -3, max: 2 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+
+  describe('one of graphs on zero', () => {
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: 0, max: 3 }, { min: 5, max: 10 }];
+      expected = [{ min: 0, max: 3 }, { min: 0, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: 5, max: 10 }, { min: 0, max: 3 }];
+      expected = [{ min: 0, max: 10 }, { min: 0, max: 3 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -3, max: 0 }, { min: -10, max: -5 }];
+      expected = [{ min: -3, max: 0 }, { min: -10, max: 0 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -10, max: -5 }, { min: -3, max: 0 }];
+      expected = [{ min: -10, max: 0 }, { min: -3, max: 0 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+
+  describe('both graphs on zero', () => {
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: 0, max: 3 }, { min: -10, max: 0 }];
+      expected = [{ min: -3, max: 3 }, { min: -10, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -3, max: 0 }, { min: 0, max: 10 }];
+      expected = [{ min: -3, max: 3 }, { min: -10, max: 10 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+
+  describe('mixed placement of graphs relative to zero', () => {
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -10, max: 5 }, { min: 1, max: 3 }];
+      expected = [{ min: -10, max: 5 }, { min: -6, max: 3 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: 1, max: 3 }, { min: -10, max: 5 }];
+      expected = [{ min: -6, max: 3 }, { min: -10, max: 5 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -10, max: 5 }, { min: -3, max: -1 }];
+      expected = [{ min: -10, max: 5 }, { min: -3, max: 1.5 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      yaxes = [{ min: -3, max: -1 }, { min: -10, max: 5 }];
+      expected = [{ min: -3, max: 1.5 }, { min: -10, max: 5 }];
+
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+
+    it('Should shrink Y axes', () => {
+      alignYLevel(yaxes, alignY);
+      expect(yaxes).toMatchObject(expected);
+    });
+  });
+});