test: added unit test for segment utils (#118)

src/segment/__tests__/utils.test.ts

@@ -0,0 +1,95 @@
+import { getSegmentLimits, setSegment, cycleValue } from "../__utils";
+import MockDate from "mockdate";
+
+describe("Segment Utils", () => {
+  test("getSegmentLimits", () => {
+    MockDate.set(new Date("2020-02-01T11:30:00.000Z"));
+
+    expect(getSegmentLimits(new Date(), "month", {})).toEqual({
+      value: 2,
+      minValue: 1,
+      maxValue: 12,
+    });
+
+    expect(getSegmentLimits(new Date(), "year", {})).toEqual({
+      value: 2020,
+      minValue: 1,
+      maxValue: 9999,
+    });
+
+    expect(getSegmentLimits(new Date(), "day", {})).toEqual({
+      value: 1,
+      minValue: 1,
+      maxValue: 29,
+    });
+
+    expect(getSegmentLimits(new Date(), "dayPeriod", {})).toEqual({
+      value: 12,
+      minValue: 0,
+      maxValue: 12,
+    });
+
+    expect(getSegmentLimits(new Date(), "minute", {})).toEqual({
+      value: 0,
+      minValue: 0,
+      maxValue: 59,
+    });
+
+    expect(getSegmentLimits(new Date(), "second", {})).toEqual({
+      value: 0,
+      minValue: 0,
+      maxValue: 59,
+    });
+  });
+
+  test("setSegment", () => {
+    MockDate.set(new Date("2020-02-01T11:30:00.000Z"));
+
+    const options = new Intl.DateTimeFormat().resolvedOptions();
+    expect(setSegment(new Date(), "month", 5, options)).toEqual(
+      new Date("2020-05-01T11:30:00.000Z"),
+    );
+
+    expect(setSegment(new Date(), "day", 5, options)).toEqual(
+      new Date("2020-02-05T11:30:00.000Z"),
+    );
+
+    expect(setSegment(new Date(), "hour", 10, options)).toEqual(
+      new Date("2020-02-01T04:30:00.000Z"),
+    );
+
+    expect(setSegment(new Date(), "year", 2050, options)).toEqual(
+      new Date("2050-02-01T11:30:00.000Z"),
+    );
+  });
+
+  describe("cycleValue", () => {
+    it("it should cycle one step", () => {
+      let value = 100;
+      value = cycleValue(value, 1, 0, 500, false);
+
+      expect(value).toBe(101);
+    });
+
+    it("it should cycle back at when reached max value", () => {
+      let value = 100;
+      value = cycleValue(value, 1, 0, 100, false);
+
+      expect(value).toBe(0);
+    });
+
+    it("it should cycle from minimum value if it's our of range", () => {
+      let value = 0;
+      value = cycleValue(value, 1, 50, 100, false);
+
+      expect(value).toBe(52);
+    });
+
+    it("it should cycle with round", () => {
+      let value = 0;
+      value = cycleValue(value, 10, 0, 100, true);
+
+      expect(value).toBe(10);
+    });
+  });
+});