Added tests for Strings algorithms (#390)

* test: added tests for check anagram function

String/ReverseString.test.js

@@ -0,0 +1,63 @@
+import {
+  ReverseStringIterative,
+  ReverseStringIterativeInplace
+} from './ReverseString'
+
+describe('ReverseStringIterative', () => {
+  it('expects to reverse a simple string', () => {
+    const SUT = ReverseStringIterative('reverse')
+    expect(SUT).toEqual('esrever')
+  })
+  it('expects to reverse a string with spaces in between', () => {
+    const SUT = ReverseStringIterative('reverse me')
+    expect(SUT).toEqual('em esrever')
+  })
+  it('expects to reverse a simple string without capitalizing the first letter', () => {
+    const SUT = ReverseStringIterative('Javascript')
+    expect(SUT).toEqual('tpircsavaJ')
+  })
+  it.each`
+    input
+    ${123456}
+    ${[1, 2, 3, 4, 5, 6]}
+    ${{ test: 'test' }}
+  `(
+    'expects to throw a type error given a value that is $input',
+    ({ input }) => {
+      expect(() => {
+        ReverseStringIterative(input)
+      }).toThrow('The given value is not a string')
+    }
+  )
+  it('expects to return a empty string with an empty string is given', () => {
+    const SUT = ReverseStringIterative('')
+    expect(SUT).toEqual('')
+  })
+})
+describe('ReverseStringIterativeInplace', () => {
+  it('expects to reverse a simple string', () => {
+    const SUT = ReverseStringIterativeInplace('reverse')
+    expect(SUT).toEqual('esrever')
+  })
+  it('expects to reverse a simple string without capitalizing the first letter', () => {
+    const SUT = ReverseStringIterativeInplace('Javascript')
+    expect(SUT).toEqual('tpircsavaJ')
+  })
+  it('expects to return an empty string given an empty string', () => {
+    const SUT = ReverseStringIterativeInplace('Javascript')
+    expect(SUT).toEqual('tpircsavaJ')
+  })
+  it.each`
+    input
+    ${123456}
+    ${[1, 2, 3, 4, 5, 6]}
+    ${{ test: 'test' }}
+  `(
+    'expects to throw a type error given a value that is $input',
+    ({ input }) => {
+      expect(() => {
+        ReverseStringIterativeInplace(input)
+      }).toThrow('The given value is not a string')
+    }
+  )
+})