test: encodable String.LocalizedValuePolyfill

Author: kphrx

Tests/SwiftLocalizedStringTests/StringLocalizationValuePolyfillTests.swift

@@ -20,6 +20,8 @@
 
 import Testing
 
+import struct Foundation.Date
+import struct Foundation.Decimal
 import class Foundation.JSONEncoder
 import class Foundation.NSLocale
 
@@ -39,4 +41,40 @@ struct StringLocalizationValuePolyfillTests {
         data: try encoder.encode("\(nsLocale)" as String.LocalizationValuePolyfill), encoding: .utf8
       ) == expected)
   }
+
+  @Test func testStringInterpolationWithFormatStyle() throws {
+    let encoder = JSONEncoder()
+    encoder.outputFormatting = .sortedKeys
+    let nsLocale = NSLocale(localeIdentifier: "en_US")
+    let expected = """
+      {"arguments":[{"formattedDecimal":{"_0":0.6,"_1":{"format":{"percent":{"_0":{"locale":{"current":2,"identifier":"en_JP"},"collection":{"scale":100}}}}}}},{"formattedDate":{"_0":759527795.92532802,"_1":{"format":{"iso8601":{"_0":{"_formatFields":[],"timeZone":{"identifier":"GMT"},"dateSeparator":"-","includingFractionalSeconds":false,"timeSeparator":":","timeZoneSeparator":"","dateTimeSeparator":"'T'"}}}}}}],"key":"decimal: %@, date: %@"}
+      """
+
+    #expect(
+      String(
+        data: try encoder.encode(
+          "decimal: \(Decimal(0.6), format: .percent), date: \(Date(timeIntervalSince1970: 0), format: .iso8601))"
+            as String.LocalizationValuePolyfill), encoding: .utf8
+      ) == expected)
+  }
+
+  @Test func testStringInterpolationWithFormatSpecifiable() throws {
+    let encoder = JSONEncoder()
+    encoder.outputFormatting = .sortedKeys
+    #if canImport(Darwin)
+    let expected = """
+      {"arguments":[{"string":{"_0":"text"}},{"uint64":{"_0":18446744073709551615}},{"int64":{"_0":-9223372036854775808}},{"double":{"_0":42.195}},{"uint32":{"_0":4294967295}},{"int32":{"_0":-2147483648}},{"float":{"_0":3.1400001049041748}}],"key":"%%@, string: %@, 64bit unsigned integer: %llu, 64bit integer: %lld, double: %lf, 32bit unsigned integer: %u, 32bit integer: %d, float: %f"}
+      """
+    #else
+    let expected = """
+      {"arguments":[{"string":{"_0":"text"}},{"uint64":{"_0":18446744073709551615}},{"int64":{"_0":-9223372036854775808}},{"double":{"_0":42.195}},{"uint32":{"_0":4294967295}},{"int32":{"_0":-2147483648}},{"float":{"_0":3.14}}],"key":"%%@, string: %@, 64bit unsigned integer: %llu, 64bit integer: %lld, double: %lf, 32bit unsigned integer: %u, 32bit integer: %d, float: %f"}
+      """
+    #endif
+
+    #expect(
+      String(
+        data: try encoder.encode(
+          "%@, string: \("text"), 64bit unsigned integer: \(UInt64.max), 64bit integer: \(Int64.min), double: \(Double(42.195)), 32bit unsigned integer: \(UInt32.max), 32bit integer: \(Int32.min), float: \(Float(3.14))"
+            as String.LocalizationValuePolyfill), encoding: .utf8) == expected)
+  }
 }