Add test for TRUSTED CERTIFICATE block (#177)

Not the best test in the world but at least it verifies that we read
this block into a certificate.

prober/tls_test.go

@@ -0,0 +1,86 @@
+package prober
+
+import (
+	"testing"
+)
+
+func TestDecodeCertificates(t *testing.T) {
+	data := []byte(`
+-----BEGIN CERTIFICATE-----
+MIIFszCCA5ugAwIBAgIUdpzowWDU/AI7QBhLSRB9DPqpWvcwDQYJKoZIhvcNAQEL
+BQAwaTELMAkGA1UEBhMCWFgxEjAQBgNVBAgMCVN0YXRlTmFtZTERMA8GA1UEBwwI
+Q2l0eU5hbWUxFDASBgNVBAoMC0NvbXBhbnlOYW1lMQwwCgYDVQQLDANGb28xDzAN
+BgNVBAMMBkZvb2JhcjAeFw0yNDA0MjgxNjIzMzNaFw0zNDA0MjYxNjIzMzNaMGkx
+CzAJBgNVBAYTAlhYMRIwEAYDVQQIDAlTdGF0ZU5hbWUxETAPBgNVBAcMCENpdHlO
+YW1lMRQwEgYDVQQKDAtDb21wYW55TmFtZTEMMAoGA1UECwwDRm9vMQ8wDQYDVQQD
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+rH8itgQ+5kOTr9d3ihcTSwTJGTyWq7j3T0xPu9tCzoPragpEDjoUCqCjU7uv6Tdq
+UhaQ8vneimSf9VdbDfEuEU9S2Xbdg6e+BsdV9uMeWkhtD1WgtSLHcliYktwnh/kh
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+AghlR24hUL1uslJOjLFc4BwLmlv/4Iy+b/3iQWY+yoban/OLZo6gCZx/4Nvg5R9e
+tcuxgn5Jhm2T/e8REucXQfiqKgxQVibFmqXeLH3Yj7ussA5t/ozo4VuypXUnnil0
+hB+PQsViaHFId1LyBKFwMoA6JzlNle6cbWVtXJswffkjk0UUr26SLHMV87lrk2kn
+IQ7ROZcT8K7gzzTxuiC2g6npmG1fDfgmgJeS7IqgiFcRTKa0hj6bvc/WoHoCpLNs
+v5KXxrGlqibeNjyc3Wng6S0Kpg6YNqU=
+-----END CERTIFICATE-----
+-----BEGIN TRUSTED CERTIFICATE-----
+MIIF7zCCA9egAwIBAgIUZXsnB0gxoPSFaUjnQeLwTW+sqbYwDQYJKoZIhvcNAQEL
+BQAwgYYxCzAJBgNVBAYTAlhYMRIwEAYDVQQIDAlTdGF0ZU5hbWUxETAPBgNVBAcM
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+0LfsLFabedOS9R1XIaQ7aKXPK4tKmNb5H/ONzH2zxU5Oqoo=
+-----END TRUSTED CERTIFICATE-----
+`)
+
+	certs, err := decodeCertificates(data)
+	if err != nil {
+		t.Errorf("unexpected error: %s", err)
+	}
+
+	if len(certs) != 2 {
+		t.Errorf("unexpected number of certs: %d", len(certs))
+	}
+}