Mark test functions in SwiftIfConfigTests that are only used in one file as file private

Author: ahoppen

Sources/SwiftIfConfig/ActiveSyntaxVisitor.swift

@@ -37,9 +37,8 @@ import SwiftSyntax
 /// it would not visit either `f` or `g`.
 ///
 /// All notes visited by this visitor will have the "active" state, i.e.,
-/// `node.isActive(in: configuration)` will have evaluated to `.active`
-/// When errors occur, they will be recorded in the set of
-/// diagnostics.
+/// `node.isActive(in: configuration)` will have evaluated to `.active`.
+/// When errors occur, they will be recorded in the array of diagnostics.
 open class ActiveSyntaxVisitor<Configuration: BuildConfiguration>: SyntaxVisitor {
   /// The build configuration, which will be queried for each relevant `#if`.
   public let configuration: Configuration

Tests/SwiftIfConfigTest/ActiveRegionTests.swift

@@ -104,7 +104,7 @@ public class ActiveRegionTests: XCTestCase {
 
 /// Assert that the various marked positions in the source code have the
 /// expected active states.
-func assertActiveCode(
+fileprivate func assertActiveCode(
   _ markedSource: String,
   configuration: some BuildConfiguration = TestingBuildConfiguration(),
   states: [String: IfConfigRegionState],

Tests/SwiftIfConfigTest/EvaluateTests.swift

@@ -234,7 +234,7 @@ public class EvaluateTests: XCTestCase {
 
 /// Assert the results of evaluating the condition within an `#if` against the
 /// given build configuration.
-func assertIfConfig(
+fileprivate func assertIfConfig(
   _ condition: ExprSyntax,
   _ expectedState: IfConfigRegionState,
   configuration: some BuildConfiguration = TestingBuildConfiguration(),

Tests/SwiftIfConfigTest/VisitorTests.swift

@@ -257,7 +257,7 @@ public class VisitorTests: XCTestCase {
 
 /// Assert that applying the given build configuration to the source code
 /// returns the expected source and diagnostics.
-func assertRemoveInactive(
+fileprivate func assertRemoveInactive(
   _ source: String,
   configuration: some BuildConfiguration,
   diagnostics expectedDiagnostics: [DiagnosticSpec] = [],