Merge pull request #197 from mcaci/caesar-test

add tests for Caesar cipher

Author: Mystigan

ciphers/CaesarCipher.go renamed to ciphers/caesar/CaesarCipher.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"testing"
+)
+
+var caesarTestData = []struct {
+	description string
+	input       string
+	key         int
+	expected    string
+}{
+	{
+		"Basic caesar encryption with letter 'a'",
+		"a",
+		3,
+		"d",
+	},
+	{
+		"Basic caesar encryption wrap around alphabet on letter 'z'",
+		"z",
+		3,
+		"c",
+	},
+	{
+		"Encrypt a simple string with ceasar encryiption",
+		"hello",
+		3,
+		"khoor",
+	},
+	{
+		"Encrypt a simple string with key 13",
+		"hello",
+		13,
+		"uryyb",
+	},
+	{
+		"Encrypt a simple string with key -13",
+		"hello",
+		-13,
+		"uryyb",
+	},
+	{
+		"With key of 26 output should be the same as the input",
+		"no change",
+		26,
+		"no change",
+	},
+	{
+		"Encrpyt sentence with key 10",
+		"the quick brown fox jumps over the lazy dog.",
+		10,
+		"dro aesmu lbygx pyh tewzc yfob dro vkji nyq.",
+	},
+}
+
+func TestCeasarCipher(t *testing.T) {
+	for _, test := range caesarTestData {
+		t.Run(test.description, func(t *testing.T) {
+			actual := caesarCipher(test.input, test.key)
+			if actual != test.expected {
+				t.Logf("FAIL: %s", test.description)
+				t.Fatalf("With input string '%s' and key '%d' was expecting '%s' but actual was '%s'",
+					test.input, test.key, test.expected, actual)
+			}
+		})
+	}
+}