Add unit tests for findMaxConsecutive1s

src/_Problems_/max-consecutive-1s/index.js

@@ -22,3 +22,5 @@ function findMaxConsecutive1s(arr) {
   if (count > max) max = count;
   return max;
 }
+
+module.exports = findMaxConsecutive1s;

src/_Problems_/max-consecutive-1s/max-consecutive-1s.test.js

@@ -0,0 +1,74 @@
+const findMaxConsecutive1s = require('.');
+
+describe('Find max consecutive 1s', function() {
+  it('returns 0 for an empty array', function() {
+    const inputArr = [];
+    const expected = 0;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 0 for an array containing a single 0', function() {
+    const inputArr = [0];
+    const expected = 0;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 1 for an array containing a single 1', function() {
+    const inputArr = [1];
+    const expected = 1;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 1 for an array containing a single 1 and 0', function() {
+    const inputArr = [1, 0];
+    const expected = 1;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 1 for an array containing a single 0 and 1', function() {
+    const inputArr = [0, 1];
+    const expected = 1;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 1 for a large alternating array of 1s and 0s', function() {
+    const inputArr = [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1];
+    const expected = 1;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 5 for increasing groups of 1s (max 5)', function() {
+    const inputArr = [1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1];
+    const expected = 5;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 5 for decreasing groups of 1s (max 5)', function() {
+    const inputArr = [1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1];
+    const expected = 5;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('returns 5 for an array of 5 1s', function() {
+    const inputArr = [1, 1, 1, 1, 1];
+    const expected = 5;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+
+  it('skips 1s that are Strings', function() {
+    const inputArr = [1, 1, "1"];
+    const expected = 2;
+
+    expect(findMaxConsecutive1s(inputArr)).toEqual(expected);
+  });
+});
+