Improve D.fromPairs and D.toPairs tests

mobily · Jul 30, 2022 · f72de16 · f72de16
1 parent 4c137a4
commit f72de16
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Showing 2 changed files with 34 additions and 6 deletions.
diff --git a/__tests__/Dict/fromPairs.test.ts b/__tests__/Dict/fromPairs.test.ts
@@ -2,20 +2,25 @@ import { expectType } from 'ts-expect'
 
 import { D, pipe } from '../..'
 
+const spread = [] as readonly (readonly [string, string | number])[]
+
 const xs = [
   ['day', 10],
   ['age', 20],
-] as readonly (readonly [string, number])[]
+] as const
+
+const xsSpread = [...spread, ['day', 10], ['age', 20]] as const
 
-const ys = [
+const numbers = [
   [0, 'Joe'],
   [1, 20],
 ] as readonly (readonly [number, string | number])[]
 
 describe('fromPairs', () => {
   it('provides correct types', () => {
-    expectType<Record<string, number>>(D.fromPairs(xs))
-    expectType<Record<string, string | number>>(D.fromPairs(ys))
+    expectType<Record<string, 10 | 20>>(D.fromPairs(xs))
+    expectType<Record<string, string | number>>(D.fromPairs(xsSpread))
+    expectType<Record<string, string | number>>(D.fromPairs(numbers))
   })
 
   it('creates a new object from an array of tuples', () => {
@@ -30,7 +35,7 @@ describe('fromPairs', () => {
       D.fromPairs([
         ['name', 'Joe'],
         ['location', 'Warsaw'],
-      ]),
+      ] as const),
     ).toEqual({ name: 'Joe', location: 'Warsaw' })
   })
 })

diff --git a/__tests__/Dict/toPairs.test.ts b/__tests__/Dict/toPairs.test.ts
@@ -1,6 +1,6 @@
 import { expectType } from 'ts-expect'
 
-import { D, pipe } from '../..'
+import { D, pipe, A } from '../..'
 
 type T = {
   readonly name: string
@@ -12,11 +12,25 @@ const user: T = {
   age: 20,
 }
 
+const obj = {} as Record<string, number>
+const number = {
+  0: 1,
+  1: 'ts-belt',
+}
+const symbol = {
+  [Symbol()]: 'oops',
+}
+
 describe('toPairs', () => {
   it('provides correct types', () => {
     expectType<ReadonlyArray<readonly [string, string | number]>>(
       D.toPairs(user),
     )
+    expectType<ReadonlyArray<readonly [string, number]>>(D.toPairs(obj))
+    expectType<ReadonlyArray<readonly [string, string | number]>>(
+      D.toPairs(number),
+    )
+    expectType<ReadonlyArray<readonly [string, string]>>(D.toPairs(symbol))
   })
 
   it('converts an object into an array of [key, value] tuples.', () => {
@@ -44,6 +58,15 @@ describe('toPairs (pipe)', () => {
     expectType<ReadonlyArray<readonly [string, string | number]>>(
       pipe(user, D.toPairs),
     )
+
+    pipe(
+      user,
+      D.toPairs,
+      A.forEach(([key, value]) => {
+        expectType<string>(key)
+        expectType<string | number>(value)
+      }),
+    )
   })
 
   it('converts an object into an array of [key, value] tuples.', () => {