Added check pangram algorithm

String/test/CheckPangram.test.js

@@ -0,0 +1,33 @@
+import { checkPangram } from '../CheckPangram'
+
+describe('checkPangram', () => {
+  it('"The quick brown fox jumps over the lazy dog" is a pangram', () => {
+    expect(
+      checkPangram('The quick brown fox jumps over the lazy dog')
+    ).toBeTruthy()
+  })
+
+  it('"Waltz, bad nymph, for quick jigs vex." is a pangram', () => {
+    expect(checkPangram('Waltz, bad nymph, for quick jigs vex.')).toBeTruthy()
+  })
+
+  it('"Jived fox nymph grabs quick waltz." is a pangram', () => {
+    expect(checkPangram('Jived fox nymph grabs quick waltz.')).toBeTruthy()
+  })
+
+  it('"My name is Unknown" is NOT a pangram', () => {
+    expect(checkPangram('My name is Unknown')).toBeFalsy()
+  })
+
+  it('"The quick brown fox jumps over the la_y dog" is NOT a pangram', () => {
+    expect(
+      checkPangram('The quick brown fox jumps over the la_y dog')
+    ).toBeFalsy()
+  })
+
+  it('Throws an error if given param is not a string', () => {
+    expect(() => {
+      checkPangram(undefined)
+    }).toThrow('The given value is not a string')
+  })
+})