test: add *ClassName tests (#34)

test/add-class-name.test.ts

@@ -0,0 +1,22 @@
+import { expect } from 'chai'
+
+import { addClassName } from '../src'
+
+describe('addClassName', function(): void {
+  const inputs: { input: string; classes: string; expected: string }[] = [
+    { input: 'a b c', classes: 'a c', expected: 'a b c' },
+    { input: 'a b c', classes: 'd', expected: 'a b c d' },
+    { input: 'c', classes: 'a b', expected: 'c a b' },
+    { input: 'class-1 class-2', classes: 'class-3', expected: 'class-1 class-2 class-3' },
+  ]
+
+  inputs.forEach(({ input, classes, expected }): void => {
+    it(`${input} + ${classes} = ${expected}`, function(): void {
+      const elem = { className: input }
+
+      addClassName(elem as any, classes)
+
+      expect(elem.className).to.equal(expected)
+    })
+  })
+})

test/remove-class-name.test.ts

@@ -0,0 +1,22 @@
+import { expect } from 'chai'
+
+import { removeClassName } from '../src'
+
+describe('removeClassName', function(): void {
+  const inputs: { input: string; classes: string; expected: string }[] = [
+    { input: 'a b c', classes: 'a c', expected: 'b' },
+    { input: 'a b c', classes: 'b', expected: 'a c' },
+    { input: 'a b c', classes: 'd', expected: 'a b c' },
+    { input: 'class-1 class-2', classes: 'class-2', expected: 'class-1' },
+  ]
+
+  inputs.forEach(({ input, classes, expected }): void => {
+    it(`${input} - ${classes} = ${expected}`, function(): void {
+      const elem = { className: input }
+
+      removeClassName(elem as any, classes)
+
+      expect(elem.className).to.equal(expected)
+    })
+  })
+})