Increase Unit Test Code Coverage

Unit test coverge was increased to cover the usages of crypto. This helps to ensure that everything is working fine with fips mode enabled.
Also updated sha1 to sha256 in registry/storage/driver/testsuites/testsuites.go because sha1 is not supported in fips mode.

Signed-off-by: Naveed Jamil <naveed.jamil@tenpearl.com>

registry/storage/driver/middleware/cloudfront/middleware_test.go

@@ -0,0 +1,60 @@
+package middleware
+
+import (
+	"testing"
+
+	check "gopkg.in/check.v1"
+	"io/ioutil"
+	"os"
+)
+
+func Test(t *testing.T) { check.TestingT(t) }
+
+type MiddlewareSuite struct{}
+
+var _ = check.Suite(&MiddlewareSuite{})
+
+func (s *MiddlewareSuite) TestNoConfig(c *check.C) {
+	options := make(map[string]interface{})
+	_, err := newCloudFrontStorageMiddleware(nil, options)
+	c.Assert(err, check.ErrorMatches, "no baseurl provided")
+}
+
+func TestCloudFrontStorageMiddlewareGenerateKey(t *testing.T) {
+
+	options := make(map[string]interface{})
+	options["baseurl"] = "example.com"
+
+	var privk = `-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+`
+
+	file, err := ioutil.TempFile("", "pkey")
+	if err != nil {
+		t.Fatal("File cannot be created")
+	}
+	file.WriteString(privk)
+	defer os.Remove(file.Name())
+	options["privatekey"] = file.Name()
+	options["keypairid"] = "test"
+	storageDriver, err := newCloudFrontStorageMiddleware(nil, options)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if storageDriver == nil {
+		t.Fatal("Driver couldnt be initialized.")
+	}
+}