Improve LayoutTest output for Errors

LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt

Index: LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt
diff --git a/LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt b/LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt
index f504b584fc6a14d28e55238e95a9b458ccc1da96..aa65df67f0cbfb750f95c86f6ad246d7783369bf 100644
--- a/LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt
+++ b/LayoutTests/crypto/hmac-generateKey-parseAlgorithm-failures-expected.txt
@@ -3,13 +3,29 @@ Tests generateKey() with bad HMAC parameters.
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
+
+generateKey() with negative length...
 error is: TypeError: HmacKeyGenParams: length: Outside of numeric range
+
+generateKey() with hash name empty string...
 error is: NotSupportedError: HmacKeyGenParams: hash: Algorithm: Unrecognized name
+
+generateKey() with length larger than an octet...
 error is: TypeError: HmacKeyGenParams: length: Outside of numeric range
+
+generateKey() with length NaN...
 error is: TypeError: HmacKeyGenParams: length: Is not a number
+
+generateKey() with length that is Infinity...
 error is: TypeError: HmacKeyGenParams: length: Outside of numeric range
+
+generateKey() with length that is -Infinity...
 error is: TypeError: HmacKeyGenParams: length: Outside of numeric range
+
+generateKey() with length that is a string...
 error is: TypeError: HmacKeyGenParams: length: Is not a number
+
+generateKey() with length that is a undefined...
 error is: TypeError: HmacKeyGenParams: length: Is not a number
 PASS successfullyParsed is true