Increased test coverage by adding test on public API.

.codecov.yml

@@ -2,5 +2,4 @@ coverage:
   range: "80...100"
   ignore:
     - "Sources/Scanner.swift"
-    - "Sources/DataURI+String.swift"
     - "Tests/"

Sources/DataURI+String.swift

@@ -6,6 +6,7 @@ extension Sequence where Iterator.Element == Byte {
     internal var base64Decoded: Bytes {
         let bytes = [Byte](self)
         let dataBase64 = Data(bytes: bytes)
+
         guard let data = Data(base64Encoded: dataBase64) else {
             return []
         }

Tests/DataURITests/DataURITests.swift

@@ -1,4 +1,7 @@
 import XCTest
+
+import Core
+
 @testable import DataURI
 
 class DataURITests: XCTestCase {
@@ -8,6 +11,7 @@ class DataURITests: XCTestCase {
         ("testHTMLText", testHTMLText),
         ("testHTMLJavascriptText", testHTMLJavascriptText),
         ("testFailedInvalidScheme", testFailedInvalidScheme),
+        ("testPublicInterface", testPublicInterface),
         ("testSpeed", testSpeed)
     ]
 
@@ -64,6 +68,14 @@ class DataURITests: XCTestCase {
         }
     }
 
+    func testPublicInterface() {
+        expectNoThrow() {
+            let (data, type) = try "data:,Hello%2C%20World!".dataURIDecoded()
+            XCTAssertEqual(data.string, "Hello, World!")
+            XCTAssertEqual(type, "text/plain;charset=US-ASCII")
+        }
+    }
+
     func testSpeed() {
         measure {
             for _ in 0..<10_000 {
@@ -73,4 +85,16 @@ class DataURITests: XCTestCase {
             }
         }
     }
+
+    //FIXME(Brett): remove when Core 1.1 includes `base64Decoded`
+    // required for 100% coverage
+    func testBase64DecodeFailure() {
+        var bytes = "SGVsbG8sIFdvcmxkIQ%3D%3D".bytes //Hello World!
+        bytes.append(0x1E) //invalid control character
+        let decodedBytes = bytes.base64Decoded
+        XCTAssertEqual(
+            decodedBytes, [],
+            "Invalid character should have caused the base64Decoder to escape."
+        )
+    }
 }