Lightning Zaps

Added initial lightning zaps/tipping integration

Changelog-Added: Receive Lightning Zaps

damusTests/FormatTests.swift

@@ -0,0 +1,37 @@
+//
+//  FormatTests.swift
+//  damusTests
+//
+//  Created by William Casarin on 2023-01-17.
+//
+
+import XCTest
+@testable import damus
+
+final class FormatTests: XCTestCase {
+
+    override func setUpWithError() throws {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDownWithError() throws {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    func testAbbrevSatsFormat() throws {
+        XCTAssertEqual(format_msats_abbrev(1_000_000 * 1000), "1m")
+        XCTAssertEqual(format_msats_abbrev(1_100_000 * 1000), "1.1m")
+        XCTAssertEqual(format_msats_abbrev(100_000_000 * 1000), "100m")
+        XCTAssertEqual(format_msats_abbrev(1000 * 1000), "1k")
+        XCTAssertEqual(format_msats_abbrev(1500 * 1000), "1.5k")
+        XCTAssertEqual(format_msats_abbrev(1595 * 1000), "1.5k")
+        XCTAssertEqual(format_msats_abbrev(100 * 1000), "100")
+        XCTAssertEqual(format_msats_abbrev(0), "0")
+        XCTAssertEqual(format_msats_abbrev(100_000_000 * 1000), "100m")
+        XCTAssertEqual(format_msats_abbrev(999 * 1000), "999")
+        XCTAssertEqual(format_msats_abbrev(999), "0.999")
+        XCTAssertEqual(format_msats_abbrev(1), "0.001")
+        XCTAssertEqual(format_msats_abbrev(1000), "1")
+    }
+
+}