feat: Adds capturing file client, for tests. Updates bump version tests

Tests/CliVersionTests/CliClientTests.swift

@@ -30,9 +30,10 @@ struct CliClientTests {
     arguments: TestArguments.bumpCases
   )
   func bump(type: CliClient.BumpOption, optional: Bool) async throws {
-    let template = optional ? Template.optional("1.0.0") : Template.build("1.0.0")
+    let template = optional ? Template.optional("1.0.0-4-g59bc977") : Template.build("1.0.0")
     try await run {
-      $0.fileClient.read = { _ in template }
+      $0.fileClient.fileExists = { _ in true }
+      $0.fileClient.read = { @Sendable _ in template }
     } operation: {
       let client = CliClient.liveValue
       let output = try await client.bump(
@@ -45,8 +46,17 @@ struct CliClientTests {
           verbose: true
         )
       )
-
       #expect(output == "/baz/Sources/bar/foo")
+    } assert: { string, _ in
+      let typeString = optional ? "String?" : "String"
+      switch type {
+      case .major:
+        #expect(string.contains("let VERSION: \(typeString) = \"2.0.0\""))
+      case .minor:
+        #expect(string.contains("let VERSION: \(typeString) = \"1.1.0\""))
+      case .patch:
+        #expect(string.contains("let VERSION: \(typeString) = \"1.0.1\""))
+      }
     }
   }
 
@@ -88,17 +98,31 @@ struct CliClientTests {
 
   func run(
     setupDependencies: @escaping (inout DependencyValues) -> Void = { _ in },
-    operation: @Sendable @escaping () async throws -> Void
+    operation: @Sendable @escaping () async throws -> Void,
+    assert: @escaping (String, URL) -> Void = { _, _ in }
   ) async throws {
+    let captured = CapturingWrite()
+
     try await withDependencies {
       $0.logger.logLevel = .debug
-      $0.fileClient = .noop
+      $0.fileClient = .capturing(captured)
       $0.fileClient.fileExists = { _ in false }
-      $0.gitVersionClient = .init { _ in "1.0.0" }
+      $0.gitVersionClient = .init { _, _ in "1.0.0" }
       setupDependencies(&$0)
     } operation: {
       try await operation()
     }
+    let data = await captured.data
+    let url = await captured.url
+
+    guard let data,
+          let string = String(bytes: data, encoding: .utf8),
+          let url
+    else {
+      throw TestError()
+    }
+
+    assert(string, url)
   }
 }
 
@@ -109,3 +133,5 @@ enum TestArguments {
     $0.append(($1, false))
   }
 }
+
+struct TestError: Error {}