simple-cipher: add test for random keys

Author: ErikSchierboom

exercises/practice/crypto-square/CryptoSquareTests.cs

@@ -47,4 +47,10 @@ public void Fifty_four_character_plaintext_results_in_7_chunks_the_last_two_with
     {
         Assert.Equal("imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau ", CryptoSquare.Ciphertext("If man was meant to stay on the ground, god would have given us roots."));
     }
+
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Fifty_four_character_plaintext_results_in_8_chunks_the_last_two_with_trailing_spaces()
+    {
+        Assert.Equal("imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn  sseoau ", CryptoSquare.Ciphertext("If man was meant to stay on the ground, god would have given us roots."));
+    }
 }

exercises/practice/game-of-life/GameOfLifeTests.cs

@@ -1,5 +1,3 @@
-using Xunit;
-
 public class GameOfLifeTests
 {
     [Fact]

exercises/practice/largest-series-product/LargestSeriesProductTests.cs

@@ -60,6 +60,18 @@ public void Rejects_span_longer_than_string_length()
         Assert.Throws<ArgumentException>(() => LargestSeriesProduct.GetLargestProduct("123", 4));
     }
 
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Rejects_span_longer_than_string_length()
+    {
+        Assert.Throws<ArgumentException>(() => LargestSeriesProduct.GetLargestProduct("123", 4));
+    }
+
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Rejects_empty_string_and_nonzero_span()
+    {
+        Assert.Throws<ArgumentException>(() => LargestSeriesProduct.GetLargestProduct("", 1));
+    }
+
     [Fact(Skip = "Remove this Skip property to run this test")]
     public void Rejects_empty_string_and_nonzero_span()
     {

exercises/practice/simple-cipher/.meta/Generator.tpl

@@ -16,8 +16,6 @@ end}}
     end
 end}}
 
-using Xunit;
-
 public class {{ testClass }}
 {
     {{- for test in tests }}
@@ -31,6 +29,13 @@ public class {{ testClass }}
         Assert.Equal({{- test.expected | string.literal }}, sut.Decode({{ test | decode_arg }}));
         {{- else if test.property == "key" }}
         Assert.Matches({{- test.expected.match | string.literal }}, sut.Key);
+        }
+
+        [Fact(Skip = "Remove this Skip property to run this test")]
+        public void Random_key_cipher_key_is_random()
+        {
+            var keys = Enumerable.Range(0, 1000).Select(_ => new SimpleCipher().Key).ToArray();
+            Assert.InRange(keys.Distinct().Count(), keys.Length - 100, keys.Length);        
         {{ end -}}
     }
     {{ end -}}

exercises/practice/simple-cipher/SimpleCipherTests.cs

@@ -28,6 +28,13 @@ public void Random_key_cipher_key_is_made_only_of_lowercase_letters()
         Assert.Matches("^[a-z]+$", sut.Key);
     }
 
+    [Fact(Skip = "Remove this Skip property to run this test")]
+    public void Random_key_cipher_key_is_random()
+    {
+        var keys = Enumerable.Range(0, 1000).Select(_ => new SimpleCipher().Key).ToArray();
+        Assert.InRange(keys.Distinct().Count(), keys.Length - 100, keys.Length);
+    }
+
     [Fact(Skip = "Remove this Skip property to run this test")]
     public void Substitution_cipher_can_encode()
     {