Improve LayoutTest output for Errors

LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt

Index: LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt
diff --git a/LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt b/LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt
index 38a3e45f9ef6ace19086d89c038c717bb8571544..c1e1a7f1dd2651ff0c0a24f0b6b1c86a46e0da66 100644
--- a/LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt
+++ b/LayoutTests/crypto/ecdh-deriveBits-failures-expected.txt
@@ -3,15 +3,34 @@ Tests bad inputs to ECDH's deriveBits()
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
+deriveBits() without algorithm name or public key...
 error is: TypeError: Algorithm: name: Missing or not a string
+
+deriveBits() without public key...
 error is: TypeError: EcdhKeyDeriveParams: public: Missing required property
+
+deriveBits() with algorithm name that is null...
 error is: TypeError: Algorithm: Not an object
+
+deriveBits() with algorithm name that is -1...
 error is: NotSupportedError: Algorithm: Unrecognized name
+
+deriveBits() with public key that is null...
 error is: TypeError: EcdhKeyDeriveParams: public: Must be a CryptoKey
+
+deriveBits() with public key that is -1...
 error is: TypeError: EcdhKeyDeriveParams: public: Must be a CryptoKey
+
+deriveBits() with public key that is a string...
 error is: TypeError: EcdhKeyDeriveParams: public: Must be a CryptoKey
+
+deriveBits() with wrong curve public key...
 error is: InvalidAccessError: The public parameter for ECDH key derivation is for a different named curve
+
+deriveBits() with private key as public key...
 error is: InvalidAccessError: The public parameter for ECDH key derivation is not a public EC key
+
+deriveBits() with public key that is for ECDSA...
 error is: InvalidAccessError: The public parameter for ECDH key derivation must be for ECDH
 PASS successfullyParsed is true