test: split ModuleDependencyGraph into graph and action

Author: nkcsgexi

test/ScanDependencies/Inputs/ModuleDependencyGraph.swift

@@ -144,11 +144,3 @@ struct ModuleDependencyGraph: Codable {
   /// Information about the main module.
   var mainModule: ModuleDependencies { modules[.swift(mainModuleName)]! }
 }
-
-let fileName = CommandLine.arguments[1]
-let data = try! Data(contentsOf: URL(fileURLWithPath: fileName))
-
-let decoder = JSONDecoder()
-let moduleDependencyGraph = try! decoder.decode(
-  ModuleDependencyGraph.self, from: data)
-print(moduleDependencyGraph)

test/ScanDependencies/Inputs/PrintGraph.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+let fileName = CommandLine.arguments[1]
+let data = try! Data(contentsOf: URL(fileURLWithPath: fileName))
+
+let decoder = JSONDecoder()
+let moduleDependencyGraph = try! decoder.decode(
+  ModuleDependencyGraph.self, from: data)
+print(moduleDependencyGraph)

test/ScanDependencies/module_deps.swift

@@ -11,7 +11,9 @@
 // Check that the JSON parses correctly into the canonical Swift data
 // structures.
 
-// RUN: %target-build-swift %S/Inputs/ModuleDependencyGraph.swift -o %t/main
+// RUN: mkdir -p %t/PrintGraph
+// RUN: cp %S/Inputs/PrintGraph.swift %t/main.swift
+// RUN: %target-build-swift %S/Inputs/ModuleDependencyGraph.swift %t/main.swift -o %t/main
 // RUN: %target-codesign %t/main
 // RUN: %target-run %t/main %t/deps.json