Add unit tests to Max Consecutive 1s problem

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 +1,20 @@
+const { findMaxConsecutive1s } = require(".");
+
+describe("Find maximum numbers of consecutive 1s", () => {
+  it("returns 1 if there is only one number 1", () => {
+    expect(findMaxConsecutive1s([1])).toEqual(1);
+  });
+
+  it("return the appropriate count for a large array", () => {
+    const largeArray = [0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1];
+    expect(findMaxConsecutive1s(largeArray)).toEqual(5);
+  });
+
+  it("returns count 0 if there is no number 1", () => {
+    expect(findMaxConsecutive1s([0, 2, 3, 9, 0])).toEqual(0);
+  });
+
+  it("does NOT count negative 1s", () => {
+    expect(findMaxConsecutive1s([1, 1, 0, -1, -1, -1])).toEqual(2);
+  });
+});