sourcekit-lsp/Tests/SourceKitLSPTests/DependencyTrackingTests.swift

//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

import LanguageServerProtocol
import SKTestSupport
import XCTest

final class DependencyTrackingTests: XCTestCase {
  func testDependenciesUpdatedSwift() async throws {
    let ws = try await SwiftPMTestWorkspace(
      files: [
        "LibA/LibA.swift": """
        public func aaa() {}
        """,
        "LibB/LibB.swift": """
        import LibA
        public func bbb() {
          aaa()
        }
        """,
      ],
      manifest: """
        // swift-tools-version: 5.7

        import PackageDescription

        let package = Package(
          name: "MyLibrary",
          targets: [
           .target(name: "LibA"),
           .target(name: "LibB", dependencies: ["LibA"]),
          ]
        )
        """
    )

    let (libBUri, _) = try ws.openDocument("LibB.swift")

    let initialDiags = try await ws.testClient.nextDiagnosticsNotification()
    // Semantic analysis: expect module import error.
    XCTAssertEqual(initialDiags.diagnostics.count, 1)
    if let diagnostic = initialDiags.diagnostics.first {
      // FIXME: The error message for the missing module is misleading on Darwin
      // https://github.com/apple/swift-package-manager/issues/5925
      XCTAssert(
        diagnostic.message.contains("Could not build Objective-C module")
          || diagnostic.message.contains("No such module"),
        "expected module import error but found \"\(diagnostic.message)\""
      )
    }

    try await SwiftPMTestWorkspace.build(at: ws.scratchDirectory)

    await ws.testClient.server.filesDependenciesUpdated([libBUri])

    let updatedDiags = try await ws.testClient.nextDiagnosticsNotification()
    // Semantic analysis: no more errors expected, import should resolve since we built.
    XCTAssertEqual(updatedDiags.diagnostics.count, 0)
  }

  func testDependenciesUpdatedCXX() async throws {
    let ws = try await MultiFileTestWorkspace(files: [
      "lib.c": """
      int libX(int value) {
        return value ? 22 : 0;
      }
      """,
      "main.c": """
      #include "lib-generated.h"

      int main(int argc, const char *argv[]) {
        return libX(argc);
      }
      """,
      "compile_flags.txt": "",
    ])

    let generatedHeaderURL = try ws.uri(for: "main.c").fileURL!.deletingLastPathComponent()
      .appendingPathComponent("lib-generated.h", isDirectory: false)

    // Write an empty header file first since clangd doesn't handle missing header
    // files without a recently upstreamed extension.
    try "".write(to: generatedHeaderURL, atomically: true, encoding: .utf8)
    let (mainUri, _) = try ws.openDocument("main.c")

    let openDiags = try await ws.testClient.nextDiagnosticsNotification()
    // Expect one error:
    // - Implicit declaration of function invalid
    XCTAssertEqual(openDiags.diagnostics.count, 1)

    // Update the header file to have the proper contents for our code to build.
    let contents = "int libX(int value);"
    try contents.write(to: generatedHeaderURL, atomically: true, encoding: .utf8)

    await ws.testClient.server.filesDependenciesUpdated([mainUri])

    let updatedDiags = try await ws.testClient.nextDiagnosticsNotification()
    // No more errors expected, import should resolve since we the generated header file
    // now has the proper contents.
    XCTAssertEqual(updatedDiags.diagnostics.count, 0)
  }
}