test: add utils unit tests

utils/__tests__/colors.test.ts

@@ -0,0 +1,44 @@
+import { getColorRGBAFromHex } from "../colors"
+
+describe("utils/colors", () => {
+  describe("getColorRGBAFromHex", () => {
+    it("should return the correct rgba value when given a hex color and opacity (black 0)", () => {
+      // Arrange - Given
+      const hexColor = "#000000"
+      const opacity = 0
+
+      // Act - When
+      const result = getColorRGBAFromHex({ hexColor, opacity })
+
+      // Assert - Then
+      const expected = "rgba(0, 0, 0, 0)"
+      expect(result).toEqual(expected)
+    })
+
+    it("should return the correct rgba value when given a hex color and opacity (red 255)", () => {
+      // Arrange - Given
+      const hexColor = "#FF0000"
+      const opacity = 0.5
+
+      // Act - When
+      const result = getColorRGBAFromHex({ hexColor, opacity })
+
+      // Assert - Then
+      const expected = "rgba(255, 0, 0, 0.5)"
+      expect(result).toEqual(expected)
+    })
+
+    it("should return the correct rgba value when given a hex color with 3 characters and opacity (red 255)", () => {
+      // Arrange - Given
+      const hexColor = "#F00"
+      const opacity = 0.5
+
+      // Act - When
+      const result = getColorRGBAFromHex({ hexColor, opacity })
+
+      // Assert - Then
+      const expected = "rgba(255, 0, 0, 0.5)"
+      expect(result).toEqual(expected)
+    })
+  })
+})

utils/__tests__/dates.test.ts

@@ -0,0 +1,55 @@
+import { getISODate, getWeekNumber } from "../dates"
+
+describe("utils/dates", () => {
+  describe("getISODate", () => {
+    it("should return the correct date in ISO format (e.g: 2012-05-23)", () => {
+      // Arrange - Given
+      const date = new Date("2012-05-23")
+
+      // Act - When
+      const result = getISODate(date)
+
+      // Assert - Then
+      const expected = "2012-05-23"
+      expect(result).toEqual(expected)
+    })
+  })
+
+  describe("getWeekNumber", () => {
+    it("should return the correct week number for a given date (e.g: 2020-01-01)", () => {
+      // Arrange - Given
+      const date = new Date("2020-01-01")
+
+      // Act - When
+      const result = getWeekNumber(date)
+
+      // Assert - Then
+      const expected = 1
+      expect(result).toEqual(expected)
+    })
+
+    it("should return the correct week number for a given date (e.g: 2020-01-08)", () => {
+      // Arrange - Given
+      const date = new Date("2020-01-08")
+
+      // Act - When
+      const result = getWeekNumber(date)
+
+      // Assert - Then
+      const expected = 2
+      expect(result).toEqual(expected)
+    })
+
+    it("should return the correct week number for a given date (e.g: 2020-12-31)", () => {
+      // Arrange - Given
+      const date = new Date("2020-12-31")
+
+      // Act - When
+      const result = getWeekNumber(date)
+
+      // Assert - Then
+      const expected = 53
+      expect(result).toEqual(expected)
+    })
+  })
+})

utils/__tests__/strings.test.ts

@@ -0,0 +1,17 @@
+import { capitalize } from "../strings"
+
+describe("utils/strings", () => {
+  describe("capitalize", () => {
+    it("should capitalize the first letter of a string", () => {
+      // Arrange - Given
+      const string = "hello world"
+
+      // Act - When
+      const result = capitalize(string)
+
+      // Assert - Then
+      const expected = "Hello world"
+      expect(result).toEqual(expected)
+    })
+  })
+})

utils/dates.ts

@@ -28,8 +28,8 @@ export const getNowDate = (): Date => {
  * Get the week number [1-52] for a given date.
  * @param {Date} date
  * @returns {number}
- * @example getWeekNumber(new Date(2020, 0, 1)) // 1
- * @example getWeekNumber(new Date(2020, 0, 8)) // 2
+ * @example getWeekNumber(new Date("2020-01-01")) // 1
+ * @example getWeekNumber(new Date("2020-01-08")) // 2
  */
 export const getWeekNumber = (date: Date): number => {
   const dateCopy = new Date(date.getTime())