add signature test harness and try a valid signature for size.

error paths to come.

signature_test.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package btcec_test
+
+import (
+	"github.com/conformal/btcec"
+	"testing"
+)
+
+type signatureTest struct {
+	name    string
+	sig     []byte
+	isValid bool
+}
+
+var signatureTests = []signatureTest{
+	// signatures from bitcoin blockchain tx
+	// 0437cd7f8525ceed2324359c2d0ba26006d92d85
+	signatureTest{
+		name: "valid signature.",
+		sig: []byte{0x30, 0x44, 0x02, 0x20, 0x4e, 0x45, 0xe1, 0x69,
+			0x32, 0xb8, 0xaf, 0x51, 0x49, 0x61, 0xa1, 0xd3, 0xa1,
+			0xa2, 0x5f, 0xdf, 0x3f, 0x4f, 0x77, 0x32, 0xe9, 0xd6,
+			0x24, 0xc6, 0xc6, 0x15, 0x48, 0xab, 0x5f, 0xb8, 0xcd,
+			0x41, 0x02, 0x20, 0x18, 0x15, 0x22, 0xec, 0x8e, 0xca,
+			0x07, 0xde, 0x48, 0x60, 0xa4, 0xac, 0xdd, 0x12, 0x90,
+			0x9d, 0x83, 0x1c, 0xc5, 0x6c, 0xbb, 0xac, 0x46, 0x22,
+			0x08, 0x22, 0x21, 0xa8, 0x76, 0x8d, 0x1d, 0x09, 0x01,
+		},
+		isValid: true,
+	},
+}
+
+func TestSignatures(t *testing.T) {
+	for _, test := range signatureTests {
+		_, err := btcec.ParseSignature(test.sig, btcec.S256())
+		if err != nil {
+			if test.isValid {
+				t.Errorf("%s signature failed when shouldn't %v",
+					test.name, err)
+			}
+			continue
+		}
+		if !test.isValid {
+			t.Errorf("%s counted as valid when it should fail",
+				test.name)
+		}
+	}
+}

test_coverage.txt

@@ -14,7 +14,7 @@ github.com/conformal/btcec/pubkey.go	 isOdd				 100.00% (1/1)
 github.com/conformal/btcec/pubkey.go	 ParsePubKey			 96.88% (31/32)
 github.com/conformal/btcec/btcec.go	 KoblitzCurve.addJacobian	 91.67% (55/60)
 github.com/conformal/btcec/btcec.go	 KoblitzCurve.affineFromJacobian 90.00% (9/10)
-github.com/conformal/btcec/signature.go	 ParseSignature			 0.00% (0/41)
+github.com/conformal/btcec/signature.go	 ParseSignature			 70.73% (29/41)
 github.com/conformal/btcec/btcec.go	 KoblitzCurve.Double		 0.00% (0/2)
-github.com/conformal/btcec		 ------------------------------- 75.61% (155/205)
+github.com/conformal/btcec		 ------------------------------- 89.76% (184/205)