Convert SatsPrice to a Skip multiplatform app

Tests/SatsPriceTests/SatsViewModelTests.swift

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+// This is free software: you can redistribute and/or modify it
+// under the terms of the GNU General Public License 3.0
+// as published by the Free Software Foundation https://fsf.org
+//
+//  SatsViewModelTests.swift
+//  SatsPriceTests
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import XCTest
+@testable import SatsPrice
+
+final class SatsViewModelTests: XCTestCase {
+
+    func testSatsViewModel() {
+        let satsViewModel = SatsViewModel()
+        satsViewModel.btcToUsdString = "54321"
+
+        // Test BTC updates.
+        satsViewModel.btcString = "1"
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "1"))
+        XCTAssertEqual(satsViewModel.btcString, "1")
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "100000000"))
+        XCTAssertEqual(satsViewModel.satsString, "100000000")
+        XCTAssertEqual(satsViewModel.usd, Decimal(string: "54321"))
+        XCTAssertEqual(satsViewModel.usdString, "54321")
+
+        // Test Sats updates.
+        satsViewModel.satsString = "200000000"
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "2"))
+        XCTAssertEqual(satsViewModel.btcString, "2")
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "200000000"))
+        XCTAssertEqual(satsViewModel.satsString, "200000000")
+        XCTAssertEqual(satsViewModel.usd, Decimal(string: "108642"))
+        XCTAssertEqual(satsViewModel.usdString, "108642")
+
+        // Test USD updates.
+        satsViewModel.usdString = "162963"
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "3"))
+        XCTAssertEqual(satsViewModel.btcString, "3")
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "300000000"))
+        XCTAssertEqual(satsViewModel.satsString, "300000000")
+        XCTAssertEqual(satsViewModel.usd, Decimal(string: "162963"))
+        XCTAssertEqual(satsViewModel.usdString, "162963")
+
+        // Test fractional amounts.
+        satsViewModel.usdString = "1"
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "0.00001840908672520756245282671526665562"))
+        XCTAssertEqual(satsViewModel.btcString, "0.00001840908672520756245282671526665562")
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "1840.908672520756245282671526665562"))
+        XCTAssertEqual(satsViewModel.satsString, "1840.908672520756245282671526665562")
+        XCTAssertEqual(satsViewModel.usd, Decimal(string: "1"))
+        XCTAssertEqual(satsViewModel.usdString, "1")
+
+        // Test large amounts that exceed the cap of 21M BTC.
+        satsViewModel.usdString = "11407419999999"
+        XCTAssertEqual(satsViewModel.btc, Decimal(string: "210000184.09084884298889932070469983984"))
+        XCTAssertEqual(satsViewModel.btcString, "210000184.09084884298889932070469983984")
+        XCTAssertEqual(satsViewModel.sats, Decimal(string: "21000018409084884.298889932070469983984"))
+        XCTAssertEqual(satsViewModel.satsString, "21000018409084884.298889932070469983984")
+        XCTAssertEqual(satsViewModel.usd, Decimal(string: "11407419999999"))
+        XCTAssertEqual(satsViewModel.usdString, "11407419999999")
+    }
+
+}

Tests/SatsPriceTests/Skip/skip.yml

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+# Configuration file for https://skip.tools project
+#build:
+#  contents:

Tests/SatsPriceTests/XCSkipTests.swift

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+// This is free software: you can redistribute and/or modify it
+// under the terms of the GNU General Public License 3.0
+// as published by the Free Software Foundation https://fsf.org
+
+import Foundation
+#if os(macOS) // Skip transpiled tests only run on macOS targets
+import SkipTest
+
+/// This test case will run the transpiled tests for the Skip module.
+@available(macOS 13, macCatalyst 16, *)
+final class XCSkipTests: XCTestCase, XCGradleHarness {
+    public func testSkipModule() async throws {
+        // Run the transpiled JUnit tests for the current test module.
+        // These tests will be executed locally using Robolectric.
+        // Connected device or emulator tests can be run by setting the
+        // `ANDROID_SERIAL` environment variable to an `adb devices`
+        // ID in the scheme's Run settings.
+        //
+        // Note that it isn't currently possible to filter the tests to run.
+        try await runGradleTests()
+    }
+}
+#endif
+
+/// True when running in a transpiled Java runtime environment
+let isJava = ProcessInfo.processInfo.environment["java.io.tmpdir"] != nil
+/// True when running within an Android environment (either an emulator or device)
+let isAndroid = isJava && ProcessInfo.processInfo.environment["ANDROID_ROOT"] != nil
+/// True is the transpiled code is currently running in the local Robolectric test environment
+let isRobolectric = isJava && !isAndroid
+/// True if the system's `Int` type is 32-bit.
+let is32BitInteger = Int64(Int.max) == Int64(Int32.max)