#69 : Fix unit tests

src/utils/page.js

@@ -8,7 +8,10 @@ export function getNextParticleIndexLimited({
   particlesToScroll,
 }) {
   if (particlesCount < 1) throw new Error('particlesCount must be at least 1')
-  return currentParticleIndex + Math.min(particlesCount - (currentParticleIndex + 1) - particlesToScroll, particlesToScroll)
+  return Math.max(
+    currentParticleIndex + Math.min(particlesCount - (currentParticleIndex + 1) - particlesToScroll, particlesToScroll),
+    0
+  )
 }
 
 export function getNextParticleIndexInfinte({

src/utils/page.test.js

@@ -7,182 +7,188 @@ import {
   getPartialPageSize,
 } from './page.js'
 
-// describe('getNextParticleIndexLimited', () => {
-//   it('returns next page index as expected', () => {
-//     const testCases = [
-//       { currentParticleIndex: -5, particlesCount: 3, particlesToScroll: 1, expected: 0 },
-//       { currentParticleIndex: 0, particlesCount: 3, particlesToScroll: 1, expected: 1 },
-//       { currentParticleIndex: 1, particlesCount: 3, particlesToScroll: 1, expected: 2 },
-//       { currentParticleIndex: 2, particlesCount: 3, particlesToScroll: 1, expected: 2 },
-//       { currentParticleIndex: 7, particlesCount: 3, particlesToScroll: 1, expected: 2 },
-//     ]
-//     testCases.forEach(({
-//       currentParticleIndex,
-//       particlesCount,
-//       particlesToScroll,
-//       expected,
-//     }) => {
-//       expect(getNextParticleIndexLimited({
-//         currentParticleIndex,
-//         particlesCount,
-//         particlesToScroll,
-//       })).toBe(expected)
-//     })
-//   })
-//   it('throws error if particlesCount is less than 1', () => {
-//     const currentParticleIndex = 5
-//     const particlesCount = 0
-//     const particlesToScroll = 1
-//     expect(
-//       () => getNextParticleIndexLimited({
-//         currentParticleIndex,
-//         particlesCount,
-//         particlesToScroll,
-//       })
-//     ).toThrowError('particlesCount must be at least 1')
-//   })
-// })
+describe('getNextParticleIndexLimited', () => {
+  it('returns next page index as expected', () => {
+    const testCases = [
+      { currentParticleIndex: -5, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 0, particlesCount: 7, particlesToScroll: 2, expected: 2 },
+      { currentParticleIndex: 2, particlesCount: 7, particlesToScroll: 2, expected: 4 },
+      { currentParticleIndex: 7, particlesCount: 7, particlesToScroll: 2, expected: 4 },
+    ]
+    testCases.forEach(({
+      currentParticleIndex,
+      particlesCount,
+      particlesToScroll,
+      expected,
+    }) => {
+      expect(getNextParticleIndexLimited({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+      })).toBe(expected)
+    })
+  })
+  it('throws error if particlesCount is less than 1', () => {
+    const currentParticleIndex = 5
+    const particlesCount = 0
+    const particlesToScroll = 1
+    expect(
+      () => getNextParticleIndexLimited({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+      })
+    ).toThrowError('particlesCount must be at least 1')
+  })
+})
 
-// describe('getNextParticleIndexInfinte', () => {
-//   it('returns next page index as expected', () => {
-//     const testCases = [
-//       { currentParticleIndex: -5, particlesCount: 3, expected: 1 },
-//       { currentParticleIndex: 0, particlesCount: 3, expected: 1 },
-//       { currentParticleIndex: 1, particlesCount: 3, expected: 2 },
-//       { currentParticleIndex: 2, particlesCount: 3, expected: 0 },
-//       { currentParticleIndex: 7, particlesCount: 3, expected: 0 },
-//     ]
-//     testCases.forEach(({
-//       currentParticleIndex,
-//       particlesCount,
-//       expected,
-//     }) => {
-//       expect(getNextParticleIndexInfinte({
-//         currentParticleIndex,
-//         particlesCount,
-//       })).toBe(expected)
-//     })
-//   })
-//   it('throws error if particlesCount is less than 1', () => {
-//     const currentParticleIndex = 5
-//     const particlesCount = 0
-//     expect(
-//       () => getNextParticleIndexInfinte({
-//         currentParticleIndex,
-//         particlesCount,
-//       })
-//     ).toThrowError('particlesCount must be at least 1')
-//   })
-// })
+describe('getNextParticleIndexInfinte', () => {
+  it('returns next page index as expected', () => {
+    const testCases = [
+      { currentParticleIndex: -5, particlesCount: 7, particlesToScroll: 2, clonesCountTail: 3, expected: 2 },
+      { currentParticleIndex: 0, particlesCount: 7, particlesToScroll: 2, clonesCountTail: 3, expected: 2 },
+      { currentParticleIndex: 2, particlesCount: 7, particlesToScroll: 2, clonesCountTail: 3, expected: 4 },
+      { currentParticleIndex: 7, particlesCount: 7, particlesToScroll: 2, clonesCountTail: 3, expected: 4 },
+    ]
+    testCases.forEach(({
+      currentParticleIndex,
+      particlesCount,
+      particlesToScroll,
+      clonesCountTail,
+      expected,
+    }) => {
+      expect(getNextParticleIndexInfinte({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+        clonesCountTail,
+      })).toBe(expected)
+    })
+  })
+  it('throws error if particlesCount is less than 1', () => {
+    const currentParticleIndex = 5
+    const particlesCount = 0
+    expect(
+      () => getNextParticleIndexInfinte({
+        currentParticleIndex,
+        particlesCount,
+      })
+    ).toThrowError('particlesCount must be at least 1')
+  })
+})
 
-// describe('getPrevParticleIndexLimited', () => {
-//   it('returns prev page index as expected', () => {
-//     const testCases = [
-//       { currentParticleIndex: -5, particlesCount: 3, expected: 0 },
-//       { currentParticleIndex: 0, particlesCount: 3, expected: 0 },
-//       { currentParticleIndex: 1, particlesCount: 3, expected: 0 },
-//       { currentParticleIndex: 2, particlesCount: 3, expected: 1 },
-//       { currentParticleIndex: 7, particlesCount: 3, expected: 2 },
-//     ]
-//     testCases.forEach(({
-//       currentParticleIndex,
-//       particlesCount,
-//       expected,
-//     }) => {
-//       expect(getPrevParticleIndexLimited({
-//         currentParticleIndex,
-//         particlesCount,
-//       })).toBe(expected)
-//     })
-//   })
-//   it('throws error if particlesCount is less than 1', () => {
-//     const currentParticleIndex = 5
-//     const particlesCount = 0
-//     expect(
-//       () => getPrevParticleIndexLimited({
-//         currentParticleIndex,
-//         particlesCount,
-//       })
-//     ).toThrowError('particlesCount must be at least 1')
-//   })
-// })
+describe('getPrevParticleIndexLimited', () => {
+  it('returns prev page index as expected', () => {
+    const testCases = [
+      { currentParticleIndex: -5, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 0, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 2, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 4, particlesCount: 7, particlesToScroll: 2, expected: 2 },
+      { currentParticleIndex: 10, particlesCount: 7, particlesToScroll: 2, expected: 6 },
+    ]
+    testCases.forEach(({
+      currentParticleIndex,
+      particlesCount,
+      particlesToScroll,
+      expected,
+    }) => {
+      expect(getPrevParticleIndexLimited({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+      })).toBe(expected)
+    })
+  })
+  it('throws error if particlesCount is less than 1', () => {
+    const currentParticleIndex = 5
+    const particlesCount = 0
+    expect(
+      () => getPrevParticleIndexLimited({
+        currentParticleIndex,
+        particlesCount,
+      })
+    ).toThrowError('particlesCount must be at least 1')
+  })
+})
 
-// describe('getPrevParticleIndexInfinte', () => {
-//   it('returns prev page index as expected', () => {
-//     const testCases = [
-//       { currentParticleIndex: -5, particlesCount: 3, expected: 2 },
-//       { currentParticleIndex: 0, particlesCount: 3, expected: 2 },
-//       { currentParticleIndex: 1, particlesCount: 3, expected: 0 },
-//       { currentParticleIndex: 2, particlesCount: 3, expected: 1 },
-//       { currentParticleIndex: 7, particlesCount: 3, expected: 1 },
-//     ]
-//     testCases.forEach(({
-//       currentParticleIndex,
-//       particlesCount,
-//       expected,
-//     }) => {
-//       expect(getPrevParticleIndexInfinte({
-//         currentParticleIndex,
-//         particlesCount,
-//       })).toBe(expected)
-//     })
-//   })
-//   it('throws error if particlesCount is less than 1', () => {
-//     const currentParticleIndex = 5
-//     const particlesCount = 0
-//     expect(
-//       () => getPrevParticleIndexInfinte({
-//         currentParticleIndex,
-//         particlesCount,
-//       })
-//     ).toThrowError('particlesCount must be at least 1')
-//   })
-// })
+describe('getPrevParticleIndexInfinte', () => {
+  it('returns prev page index as expected', () => {
+    const testCases = [
+      { currentParticleIndex: -5, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 2, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 2, particlesCount: 7, particlesToScroll: 2, expected: 0 },
+      { currentParticleIndex: 10, particlesCount: 7, particlesToScroll: 2, expected: 4 },
+    ]
+    testCases.forEach(({
+      currentParticleIndex,
+      particlesCount,
+      particlesToScroll,
+      expected,
+    }) => {
+      expect(getPrevParticleIndexInfinte({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+      })).toBe(expected)
+    })
+  })
+  it('throws error if particlesCount is less than 1', () => {
+    const currentParticleIndex = 2
+    const particlesCount = 7
+    const particlesToScroll = 2
+
+    expect(
+      () => getPrevParticleIndexInfinte({
+        currentParticleIndex,
+        particlesCount,
+        particlesToScroll,
+      })
+    ).toThrowError('particlesCount must be at least 1')
+  })
+})
 
 describe('getPartialPageSize', () => {
   it('returns result as expected if particlesToShow <= particlesToScroll', () => {
-    const testCases = [
-      {
-        particlesCountWithoutClones: 9,
+    const testCases = [{
+      pagesCountWithoutClones: 9,
       particlesToShow: 2,
       particlesToScroll: 3,
       expected: 0,
     }, {
-        particlesCountWithoutClones: 15,
+      pagesCountWithoutClones: 15,
       particlesToShow: 4,
       particlesToScroll: 5,
       expected: 0,
     }, {
-        particlesCountWithoutClones: 16,
+      pagesCountWithoutClones: 16,
       particlesToShow: 4,
       particlesToScroll: 5,
       expected: 1,
     }, {
-        particlesCountWithoutClones: 17,
+      pagesCountWithoutClones: 17,
       particlesToShow: 4,
       particlesToScroll: 5,
       expected: 2,
     }, {
-        particlesCountWithoutClones: 18,
+      pagesCountWithoutClones: 18,
       particlesToShow: 4,
       particlesToScroll: 5,
       expected: 3,
     }, {
-        particlesCountWithoutClones: 8,
+      pagesCountWithoutClones: 8,
       particlesToShow: 2,
       particlesToScroll: 2,
       expected: 0,
-      }
-    ]
+    }]
 
     testCases.forEach(({
-      particlesCountWithoutClones,
+      pagesCountWithoutClones,
       particlesToShow,
       particlesToScroll,
       expected,
     }) => {
       expect(getPartialPageSize({
-        particlesCountWithoutClones,
+        pagesCountWithoutClones,
         particlesToShow,
         particlesToScroll,
       })).toBe(expected)
@@ -190,58 +196,56 @@ describe('getPartialPageSize', () => {
   })
 
   it('returns result as expected if particlesToShow > particlesToScroll', () => {
-    const testCases = [
-      {
-        particlesCountWithoutClones: 8,
+    const testCases = [{
+      pagesCountWithoutClones: 8,
       particlesToShow: 4,
       particlesToScroll: 2,
       expected: 2,
     }, {
-        particlesCountWithoutClones: 7,
+      pagesCountWithoutClones: 7,
       particlesToShow: 4,
       particlesToScroll: 3,
       expected: 1,
     }, {
-        particlesCountWithoutClones: 8,
+      pagesCountWithoutClones: 8,
       particlesToShow: 4,
       particlesToScroll: 3,
       expected: 2,
     }, {
-        particlesCountWithoutClones: 8,
+      pagesCountWithoutClones: 8,
       particlesToShow: 2,
       particlesToScroll: 2,
       expected: 0,
     }, {
-        particlesCountWithoutClones: 9,
+      pagesCountWithoutClones: 9,
       particlesToShow: 4,
       particlesToScroll: 3,
       expected: 3,
     }, {
-        particlesCountWithoutClones: 8,
+      pagesCountWithoutClones: 8,
       particlesToShow: 3,
       particlesToScroll: 2,
       expected: 2,
     }, {
-        particlesCountWithoutClones: 6,
+      pagesCountWithoutClones: 6,
       particlesToShow: 3,
       particlesToScroll: 1,
       expected: 2,
     }, {
-        particlesCountWithoutClones: 7,
+      pagesCountWithoutClones: 7,
       particlesToShow: 3,
       particlesToScroll: 1,
       expected: 2,
-      }
-    ]
+    }]
 
     testCases.forEach(({
-      particlesCountWithoutClones,
+      pagesCountWithoutClones,
       particlesToShow,
       particlesToScroll,
       expected,
     }) => {
       expect(getPartialPageSize({
-        particlesCountWithoutClones,
+        pagesCountWithoutClones,
         particlesToShow,
         particlesToScroll,
       })).toBe(expected)