diff --git a/test/isArrayLike/isArrayLike.test.js b/test/isArrayLike/isArrayLike.test.js
index 2239caf3d..97b41b827 100644
--- a/test/isArrayLike/isArrayLike.test.js
+++ b/test/isArrayLike/isArrayLike.test.js
@@ -5,9 +5,12 @@ test('Testing isArrayLike', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isArrayLike === 'function', 'isArrayLike is a Function');
+  t.equal(isArrayLike('abc'), true, 'Returns true for a string');
+  t.equal(isArrayLike([1,2,3]), true, 'Returns true for an array');
+  t.equal(isArrayLike(null), false, 'Returns false for null');
   //t.deepEqual(isArrayLike(args..), 'Expected');
   //t.equal(isArrayLike(args..), 'Expected');
   //t.false(isArrayLike(args..), 'Expected');
   //t.throws(isArrayLike(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isEmpty/isEmpty.test.js b/test/isEmpty/isEmpty.test.js
index 2c101b5c5..76fc0aef8 100644
--- a/test/isEmpty/isEmpty.test.js
+++ b/test/isEmpty/isEmpty.test.js
@@ -5,9 +5,19 @@ test('Testing isEmpty', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isEmpty === 'function', 'isEmpty is a Function');
+  t.equal(isEmpty(new Map()), true, 'Returns true for empty Map');
+  t.equal(isEmpty(new Set()), true, 'Returns true for empty Set');
+  t.equal(isEmpty([]), true, 'Returns true for empty array');
+  t.equal(isEmpty({}), true, 'Returns true for empty object');
+  t.equal(isEmpty(''), true, 'Returns true for empty string');
+  t.equal(isEmpty([1, 2]), false, 'Returns false for non-empty array');
+  t.equal(isEmpty({ a: 1, b: 2 }), false, 'Returns false for non-empty object');
+  t.equal(isEmpty('text'), false, 'Returns false for non-empty string');
+  t.equal(isEmpty(123), true, 'Returns true - type is not considered a collection');
+  t.equal(isEmpty(true), true, 'Returns true - type is not considered a collection');
   //t.deepEqual(isEmpty(args..), 'Expected');
   //t.equal(isEmpty(args..), 'Expected');
   //t.false(isEmpty(args..), 'Expected');
   //t.throws(isEmpty(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isNil/isNil.test.js b/test/isNil/isNil.test.js
index 4ad388e23..c5e11d1f4 100644
--- a/test/isNil/isNil.test.js
+++ b/test/isNil/isNil.test.js
@@ -5,9 +5,12 @@ test('Testing isNil', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isNil === 'function', 'isNil is a Function');
+  t.equal(isNil(null), true, 'Returns true for null');
+  t.equal(isNil(undefined), true, 'Returns true for undefined');
+  t.equal(isNil(''), false, 'Returns false for an empty string');
   //t.deepEqual(isNil(args..), 'Expected');
   //t.equal(isNil(args..), 'Expected');
   //t.false(isNil(args..), 'Expected');
   //t.throws(isNil(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isObjectLike/isObjectLike.test.js b/test/isObjectLike/isObjectLike.test.js
index aa9f7b7e8..fe414423b 100644
--- a/test/isObjectLike/isObjectLike.test.js
+++ b/test/isObjectLike/isObjectLike.test.js
@@ -5,9 +5,13 @@ test('Testing isObjectLike', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isObjectLike === 'function', 'isObjectLike is a Function');
+  t.equal(isObjectLike({}), true, 'Returns true for an object');
+  t.equal(isObjectLike([1, 2, 3]), true, 'Returns true for an array');
+  t.equal(isObjectLike(x => x), false, 'Returns false for a function');
+  t.equal(isObjectLike(null), false, 'Returns false for null');
   //t.deepEqual(isObjectLike(args..), 'Expected');
   //t.equal(isObjectLike(args..), 'Expected');
   //t.false(isObjectLike(args..), 'Expected');
   //t.throws(isObjectLike(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isPlainObject/isPlainObject.test.js b/test/isPlainObject/isPlainObject.test.js
index 9de8feba3..515b61b2d 100644
--- a/test/isPlainObject/isPlainObject.test.js
+++ b/test/isPlainObject/isPlainObject.test.js
@@ -5,9 +5,11 @@ test('Testing isPlainObject', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isPlainObject === 'function', 'isPlainObject is a Function');
+  t.equal(isPlainObject({ a: 1 }), true, 'Returns true for a plain object');
+  t.equal(isPlainObject(new Map()), false, 'Returns false for a Map (example of non-plain object)');
   //t.deepEqual(isPlainObject(args..), 'Expected');
   //t.equal(isPlainObject(args..), 'Expected');
   //t.false(isPlainObject(args..), 'Expected');
   //t.throws(isPlainObject(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isPromiseLike/isPromiseLike.test.js b/test/isPromiseLike/isPromiseLike.test.js
index b84a7c798..5ce5d856b 100644
--- a/test/isPromiseLike/isPromiseLike.test.js
+++ b/test/isPromiseLike/isPromiseLike.test.js
@@ -5,9 +5,16 @@ test('Testing isPromiseLike', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isPromiseLike === 'function', 'isPromiseLike is a Function');
+  t.equal(isPromiseLike({
+    then: function() {
+      return '';
+    }
+  }), true, 'Returns true for a promise-like object');
+  t.equal(isPromiseLike(null), false, 'Returns false for null');
+  t.equal(isPromiseLike({}), false, 'Returns false for an empty object');
   //t.deepEqual(isPromiseLike(args..), 'Expected');
   //t.equal(isPromiseLike(args..), 'Expected');
   //t.false(isPromiseLike(args..), 'Expected');
   //t.throws(isPromiseLike(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/isUndefined/isUndefined.test.js b/test/isUndefined/isUndefined.test.js
index ce988c9ef..43029fcf8 100644
--- a/test/isUndefined/isUndefined.test.js
+++ b/test/isUndefined/isUndefined.test.js
@@ -5,9 +5,10 @@ test('Testing isUndefined', (t) => {
   //For more information on all the methods supported by tape
   //Please go to https://github.com/substack/tape
   t.true(typeof isUndefined === 'function', 'isUndefined is a Function');
+  t.true(isUndefined(undefined), 'Returns true for undefined');
   //t.deepEqual(isUndefined(args..), 'Expected');
   //t.equal(isUndefined(args..), 'Expected');
   //t.false(isUndefined(args..), 'Expected');
   //t.throws(isUndefined(args..), 'Expected');
   t.end();
-});
\ No newline at end of file
+});
diff --git a/test/testlog b/test/testlog
index c9b797f1e..0e9053f4f 100644
--- a/test/testlog
+++ b/test/testlog
@@ -1,4 +1,4 @@
-Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
+Test log for: Sat Feb 03 2018 13:12:08 GMT+0200 (GTB Standard Time)
 
 > 30-seconds-of-code@0.0.1 test G:\My Files\git Repositories\30-seconds-of-code
 > tape test/**/*.test.js | tap-spec
@@ -670,6 +670,9 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isArrayLike
 
     √ isArrayLike is a Function
+    √ Returns true for a string
+    √ Returns true for an array
+    √ Returns false for null
 
   Testing isBoolean
 
@@ -685,6 +688,16 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isEmpty
 
     √ isEmpty is a Function
+    √ Returns true for empty Map
+    √ Returns true for empty Set
+    √ Returns true for empty array
+    √ Returns true for empty object
+    √ Returns true for empty string
+    √ Returns false for non-empty array
+    √ Returns false for non-empty object
+    √ Returns false for non-empty string
+    √ Returns true - type is not considered a collection
+    √ Returns true - type is not considered a collection
 
   Testing isEven
 
@@ -712,6 +725,9 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isNil
 
     √ isNil is a Function
+    √ Returns true for null
+    √ Returns true for undefined
+    √ Returns false for an empty string
 
   Testing isNull
 
@@ -736,10 +752,16 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isObjectLike
 
     √ isObjectLike is a Function
+    √ Returns true for an object
+    √ Returns true for an array
+    √ Returns false for a function
+    √ Returns false for null
 
   Testing isPlainObject
 
     √ isPlainObject is a Function
+    √ Returns true for a plain object
+    √ Returns false for a Map (example of non-plain object)
 
   Testing isPrime
 
@@ -764,6 +786,9 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isPromiseLike
 
     √ isPromiseLike is a Function
+    √ Returns true for a promise-like object
+    √ Returns false for null
+    √ Returns false for an empty object
 
   Testing isRegExp
 
@@ -805,6 +830,7 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
   Testing isUndefined
 
     √ isUndefined is a Function
+    √ Returns true for undefined
 
   Testing isUpperCase
 
@@ -1662,8 +1688,8 @@ Test log for: Sat Feb 03 2018 13:01:36 GMT+0200 (GTB Standard Time)
     √ Works with multiple promises
 
 
-  total:     766
-  passing:   766
+  total:     792
+  passing:   792
   duration:  2.4s