Update Digest tests

Tests/CryptoSwiftTests/DigestTests.swift

@@ -53,10 +53,8 @@ final class DigestTests: XCTestCase {
     
     func testSHA1() {
         let data:Data = Data(bytes: UnsafePointer<UInt8>([0x31, 0x32, 0x33] as Array<UInt8>), count: 3)
-        if let hash = data.sha1() {
-            XCTAssertEqual(hash.toHexString(), "40bd001563085fc35165329ea1ff5c5ecbdbbeef", "SHA1 calculation failed");
-        }
-        
+        XCTAssertEqual(data.sha1().toHexString(), "40bd001563085fc35165329ea1ff5c5ecbdbbeef", "SHA1 calculation failed");
+
         XCTAssertEqual("abc".sha1(), "a9993e364706816aba3e25717850c26c9cd0d89d", "SHA1 calculation failed")
         XCTAssertEqual("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq".sha1(), "84983e441c3bd26ebaae4aa1f95129e5e54670f1", "SHA1 calculation failed")
         XCTAssertEqual("".sha1(), "da39a3ee5e6b4b0d3255bfef95601890afd80709", "SHA1 calculation failed")
@@ -64,27 +62,21 @@ final class DigestTests: XCTestCase {
     
     func testSHA224() {
         let data:Data = Data(bytes: UnsafePointer<UInt8>([0x31, 0x32, 0x33] as Array<UInt8>), count: 3)
-        if let hash = data.sha224() {
-            XCTAssertEqual(hash.toHexString(), "78d8045d684abd2eece923758f3cd781489df3a48e1278982466017f", "SHA224 calculation failed");
-        }
+        XCTAssertEqual(data.sha224().toHexString(), "78d8045d684abd2eece923758f3cd781489df3a48e1278982466017f", "SHA224 calculation failed");
     }
 
     func testSHA256() {
         let data:Data = Data(bytes: UnsafePointer<UInt8>([0x31, 0x32, 0x33] as Array<UInt8>), count: 3)
-        if let hash = data.sha256() {
-            XCTAssertEqual(hash.toHexString(), "a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3", "SHA256 calculation failed");
-        }
-        
+        XCTAssertEqual(data.sha256().toHexString(), "a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3", "SHA256 calculation failed");
+
         XCTAssertEqual("Rosetta code".sha256(), "764faf5c61ac315f1497f9dfa542713965b785e5cc2f707d6468d7d1124cdfcf", "SHA256 calculation failed")
         XCTAssertEqual("".sha256(), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "SHA256 calculation failed")
     }
 
     func testSHA384() {
         let data:Data = Data(bytes: UnsafePointer<UInt8>([49, 50, 51] as Array<UInt8>), count: 3)
-        if let hash = data.sha384() {
-            XCTAssertEqual(hash.toHexString(), "9a0a82f0c0cf31470d7affede3406cc9aa8410671520b727044eda15b4c25532a9b5cd8aaf9cec4919d76255b6bfb00f", "SHA384 calculation failed");
-        }
-        
+        XCTAssertEqual(data.sha384().toHexString(), "9a0a82f0c0cf31470d7affede3406cc9aa8410671520b727044eda15b4c25532a9b5cd8aaf9cec4919d76255b6bfb00f", "SHA384 calculation failed");
+
         XCTAssertEqual("The quick brown fox jumps over the lazy dog.".sha384(), "ed892481d8272ca6df370bf706e4d7bc1b5739fa2177aae6c50e946678718fc67a7af2819a021c2fc34e91bdb63409d7", "SHA384 calculation failed");
         XCTAssertEqual("".sha384(), "38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b", "SHA384 calculation failed")
         XCTAssertEqual("abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu".sha384(), "09330c33f71147e83d192fc782cd1b4753111b173b3b05d22fa08086e3b0f712fcc7c71a557e2db966c3e9fa91746039", "SHA384 calculation failed")