diff --git a/.swiftpm/xcode/xcshareddata/xcschemes/OTCore.xcscheme b/.swiftpm/xcode/xcshareddata/xcschemes/OTCore.xcscheme
deleted file mode 100644
index bba3f19..0000000
--- a/.swiftpm/xcode/xcshareddata/xcschemes/OTCore.xcscheme
+++ /dev/null
@@ -1,92 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Scheme
-   LastUpgradeVersion = "1230"
-   version = "1.3">
-   <BuildAction
-      parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES">
-      <BuildActionEntries>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "OTCore"
-               BuildableName = "OTCore"
-               BlueprintName = "OTCore"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "NO"
-            buildForArchiving = "NO"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "OTCoreTests"
-               BuildableName = "OTCoreTests"
-               BlueprintName = "OTCoreTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      codeCoverageEnabled = "YES">
-      <Testables>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "OTCoreTests"
-               BuildableName = "OTCoreTests"
-               BlueprintName = "OTCoreTests"
-               ReferencedContainer = "container:">
-            </BuildableReference>
-         </TestableReference>
-      </Testables>
-   </TestAction>
-   <LaunchAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
-   </LaunchAction>
-   <ProfileAction
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
-      useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "OTCore"
-            BuildableName = "OTCore"
-            BlueprintName = "OTCore"
-            ReferencedContainer = "container:">
-         </BuildableReference>
-      </MacroExpansion>
-   </ProfileAction>
-   <AnalyzeAction
-      buildConfiguration = "Debug">
-   </AnalyzeAction>
-   <ArchiveAction
-      buildConfiguration = "Release"
-      revealArchiveInOrganizer = "YES">
-   </ArchiveAction>
-</Scheme>
diff --git a/Sources/OTCore/XCTest/XCTWait.swift b/Sources/OTCore/XCTest/XCTWait.swift
deleted file mode 100644
index bb0cca6..0000000
--- a/Sources/OTCore/XCTest/XCTWait.swift
+++ /dev/null
@@ -1,50 +0,0 @@
-//
-//  XCTWait.swift
-//  OTCore • https://github.com/orchetect/OTCore
-//
-
-#if !os(watchOS) && canImport(XCTest)
-
-import XCTest
-
-extension XCTestCase {
-    
-    /// **OTCore:**
-    /// Simple XCTest wait timer that does not block the runloop
-    /// - Parameter timeout: floating-point duration in seconds
-    @available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
-    public func XCTWait(sec timeout: Double) {
-        
-        RunLoop.current.run(until: .init(timeIntervalSinceNow: timeout))
-        
-        
-        // old method B:
-        
-        // var inTime = timespec()
-        // _ = clock_gettime(CLOCK_MONOTONIC_RAW, &inTime)
-        //
-        // let delayExpectation = XCTestExpectation()
-        // delayExpectation.isInverted = true
-        //
-        // var adjustTime = timespec()
-        // _ = clock_gettime(CLOCK_MONOTONIC_RAW, &adjustTime)
-        //
-        // let newTimeout =
-        //     timeout
-        //     - (adjustTime.doubleValue - inTime.doubleValue)
-        //     - 0.00115
-        //
-        // wait(for: [delayExpectation], timeout: newTimeout)
-        
-        
-        // old method A:
-        
-        // let delayExpectation = XCTestExpectation()
-        // delayExpectation.isInverted = true
-        // wait(for: [delayExpectation], timeout: timeout)
-        
-    }
-    
-}
-
-#endif
diff --git a/Tests/OTCoreTests/XCTest/XCTWait Tests.swift b/Tests/OTCoreTests/XCTest/XCTWait Tests.swift
deleted file mode 100644
index 3211a75..0000000
--- a/Tests/OTCoreTests/XCTest/XCTWait Tests.swift	
+++ /dev/null
@@ -1,64 +0,0 @@
-//
-//  XCTWait Tests.swift
-//  OTCore • https://github.com/orchetect/OTCore
-//
-
-#if !os(watchOS)
-
-import XCTest
-/* @testable */ import OTCore
-
-class XCTest_XCTWait_Tests: XCTestCase {
-    
-    override func setUp() { super.setUp() }
-    override func tearDown() { super.tearDown() }
-    
-    @available(OSX 10.12, iOS 10.0, tvOS 10.0, watchOS 3.0, *)
-    func testXCTWait() {
-        
-        func runTest(duration: Double, margin: ClosedRange<Double>) {
-
-            let startTime = clock_gettime_monotonic_raw()
-            
-            XCTWait(sec: duration)
-            
-            let endTime = clock_gettime_monotonic_raw()
-            
-            let diffTime = (endTime - startTime).doubleValue
-            
-            // this unit test is flakey because it depends on the performance of the hardware it is run on
-            // additionally, CI platforms are too inconsistent and can't guarantee stability of timing mechanisms in unit tests... which means we need to approach this differently in future, but for now we'll ignore it
-            
-            XCTAssertGreaterThan(diffTime, margin.lowerBound)
-            XCTAssertLessThan(diffTime, margin.upperBound + 0.500)
-            
-            // just print a log message if diffTime is out of margin,
-            // but don't fail the test
-            if !diffTime.isContained(in: margin) {
-                Log.error("Tested XCTWait duration of \(duration)sec, with an accuracy margin of \(margin.lowerBound)...\(margin.upperBound) but measured time was out of margin at \(diffTime)sec.")
-            }
-
-        }
-        
-        // small values
-        runTest(duration: 0.0000, margin: 0.0000...0.0020)
-        runTest(duration: 0.0050, margin: 0.0049...0.0070)
-        
-        // medium value
-        runTest(duration: 0.5000, margin: 0.4999...0.5020)
-        
-        
-        
-        // alternate method, but measure{} wasn't feeling like the right tool for this job:
-        
-        //let measureOptions = XCTMeasureOptions()
-        //measureOptions.iterationCount = 3
-        //measure(options: measureOptions) {
-        //    XCTWait(sec: 0.5000)
-        //}
-        
-    }
-    
-}
-
-#endif