Import tests for String Encoding Names from other repo.

- source: https://github.com/YOCKOW/SF-StringEncodingNameImpl/blob/0.4.0/Tests/StringEncodingNameImplTests/StringEncodingNameParserTests.swift

Author: YOCKOW

Tests/FoundationEssentialsTests/StringTests.swift

@@ -1397,6 +1397,69 @@ private struct StringTests {
             "abcd🎺efgh"
         ])
     }
+
+    func test_Encoding_names() {
+        // Encoding to Name
+        XCTAssertEqual(String._Encoding.ascii.ianaName, "US-ASCII")
+        XCTAssertEqual(String._Encoding.nextstep.ianaName, nil)
+        XCTAssertEqual(String._Encoding.japaneseEUC.ianaName, "EUC-JP")
+        XCTAssertEqual(String._Encoding.utf8.ianaName, "UTF-8")
+        XCTAssertEqual(String._Encoding.isoLatin1.ianaName, "ISO-8859-1")
+        XCTAssertEqual(String._Encoding.symbol.ianaName, nil)
+        XCTAssertEqual(String._Encoding.nonLossyASCII.ianaName, nil)
+        XCTAssertEqual(String._Encoding.shiftJIS.ianaName, "Shift_JIS")
+        XCTAssertEqual(String._Encoding.isoLatin2.ianaName, "ISO-8859-2")
+        XCTAssertEqual(String._Encoding.unicode.ianaName, "UTF-16")
+        XCTAssertEqual(String._Encoding.windowsCP1251.ianaName, "windows-1251")
+        XCTAssertEqual(String._Encoding.windowsCP1252.ianaName, "windows-1252")
+        XCTAssertEqual(String._Encoding.windowsCP1253.ianaName, "windows-1253")
+        XCTAssertEqual(String._Encoding.windowsCP1254.ianaName, "windows-1254")
+        XCTAssertEqual(String._Encoding.windowsCP1250.ianaName, "windows-1250")
+        XCTAssertEqual(String._Encoding.iso2022JP.ianaName, "ISO-2022-JP")
+        XCTAssertEqual(String._Encoding.macOSRoman.ianaName, "macintosh")
+        XCTAssertEqual(String._Encoding.utf16BigEndian.ianaName, "UTF-16BE")
+        XCTAssertEqual(String._Encoding.utf16LittleEndian.ianaName, "UTF-16LE")
+        XCTAssertEqual(String._Encoding.utf32.ianaName, "UTF-32")
+        XCTAssertEqual(String._Encoding.utf32BigEndian.ianaName, "UTF-32BE")
+        XCTAssertEqual(String._Encoding.utf32LittleEndian.ianaName, "UTF-32LE")
+        XCTAssertEqual(String._Encoding(rawValue: .max).ianaName, nil)
+
+        // Name to Encoding
+        XCTAssertEqual(String._Encoding(ianaName: "us-ascii"), .ascii)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-ir-2"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "x-nextstep"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "euc-jp"), .japaneseEUC)
+        XCTAssertEqual(String._Encoding(ianaName: "CP51932"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-8"), .utf8)
+        XCTAssertEqual(String._Encoding(ianaName: "iso_8859-1"), .isoLatin1)
+        XCTAssertEqual(String._Encoding(ianaName: "x-mac-symbol"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "Adobe-symbol-encoding"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "cp932"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "shift_jis"), .shiftJIS)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-31j"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "iso_8859-2"), .isoLatin2)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-16"), .utf16)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-10646-ucs-2"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "unicode-1-1"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-1251"), .windowsCP1251)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-1252"), .windowsCP1252)
+        XCTAssertEqual(String._Encoding(ianaName: "ISO-8859-1-Windows-3.0-Latin-1"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "ISO-8859-1-Windows-3.1-Latin-1"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-1253"), .windowsCP1253)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-1254"), .windowsCP1254)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-8859-9-windows-Latin-5"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "windows-1250"), .windowsCP1250)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-8859-2-windows-Latin-2"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-2022-jp"), .iso2022JP)
+        XCTAssertEqual(String._Encoding(ianaName: "macintosh"), .macOSRoman)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-16be"), .utf16BigEndian)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-16le"), .utf16LittleEndian)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-32"), .utf32)
+        XCTAssertEqual(String._Encoding(ianaName: "iso-10646-ucs-4"), nil)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-32be"), .utf32BigEndian)
+        XCTAssertEqual(String._Encoding(ianaName: "utf-32le"), .utf32LittleEndian)
+        XCTAssertEqual(String._Encoding(ianaName: "foo-bar-baz"), nil)
+    }
 }
 
 // MARK: - Helper functions