1 files changed, 92 insertions, 0 deletions
diff --git a/date-fns/src/max/test.ts b/date-fns/src/max/test.ts
new file mode 100644
index 0000000..a394457
--- /dev/null
+++ b/date-fns/src/max/test.ts
@@ -0,0 +1,92 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import max from '.'
+
+describe('max', function() {
+  function isInvalidDate(dirtyDate: Date | number): boolean {
+    return dirtyDate instanceof Date && isNaN(Number(dirtyDate))
+  }
+
+  it('returns the latest date', function() {
+    const result = max([
+      new Date(1989, 6 /* Jul */, 10),
+      new Date(1987, 1 /* Feb */, 11)
+    ])
+    assert.deepEqual(result, new Date(1989, 6 /* Jul */, 10))
+  })
+
+  it('accepts array with more than 2 entries', function() {
+    const result = max([
+      new Date(1987, 1 /* Feb */, 11),
+      new Date(1989, 6 /* Jul */, 10),
+      new Date(1995, 6 /* Jul */, 2),
+      new Date(1990, 0 /* Jan */, 1)
+    ])
+    assert.deepEqual(result, new Date(1995, 6 /* Jul */, 2))
+  })
+
+  it('accepts timestamps', function() {
+    const result = max([
+      new Date(1989, 6 /* Jul */, 10).getTime(),
+      new Date(1987, 1 /* Feb */, 11).getTime()
+    ])
+    assert.deepEqual(result, new Date(1989, 6 /* Jul */, 10))
+  })
+
+  it('returns `Invalid Date` if any given date is invalid', function() {
+    const result = max([
+      new Date(1989, 6 /* Jul */, 10),
+      new Date(NaN),
+      new Date(1987, 1 /* Feb */, 11)
+    ])
+    assert(isInvalidDate(result))
+  })
+
+  it('returns `Invalid Date` if any given value is undefined', function() {
+    const result = max([
+      new Date(1989, 6 /* Jul */, 10),
+      // @ts-expect-error
+      undefined,
+      new Date(1987, 1 /* Feb */, 11)
+    ])
+    assert(isInvalidDate(result))
+  })
+
+  it('returns `Invalid Date` for empty array', function() {
+    const result = max([])
+    assert(isInvalidDate(result))
+  })
+
+  it('converts Array-like objects into Array', function() {
+    // @ts-expect-error
+    const result = max({
+      '0': new Date(1989, 6 /* Jul */, 10),
+      '1': new Date(1987, 1 /* Feb */, 11),
+      length: 2
+    })
+    assert.deepEqual(result, new Date(1989, 6 /* Jul */, 10))
+  })
+
+  it('converts iterable objects into Array', function() {
+    const result = max(
+      // @ts-expect-error
+      new Set([
+        new Date(1989, 6 /* Jul */, 10),
+        new Date(1987, 1 /* Feb */, 11)
+      ])
+    )
+    assert.deepEqual(result, new Date(1989, 6 /* Jul */, 10))
+  })
+
+  it('returns `Invalid Date` if given a non-iterable value', function() {
+    // @ts-expect-error
+    const result = max(undefined)
+    assert(isInvalidDate(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(max.bind(null), TypeError)
+  })
+})