refactor: Introducing Environments

Tests/StencilTests/LoaderSpec.swift

@@ -7,25 +7,26 @@ func testTemplateLoader() {
   describe("FileSystemLoader") {
     let path = Path(#file) + ".."  + "fixtures"
     let loader = FileSystemLoader(paths: [path])
+    let environment = Environment(loader: loader)
 
     $0.it("errors when a template cannot be found") {
-      try expect(try loader.loadTemplate(name: "unknown.html")).toThrow()
+      try expect(try environment.loadTemplate(name: "unknown.html")).toThrow()
     }
 
     $0.it("errors when an array of templates cannot be found") {
-      try expect(try loader.loadTemplate(names: ["unknown.html", "unknown2.html"])).toThrow()
+      try expect(try environment.loadTemplate(names: ["unknown.html", "unknown2.html"])).toThrow()
     }
 
     $0.it("can load a template from a file") {
-      _ = try loader.loadTemplate(name: "test.html")
+      _ = try environment.loadTemplate(name: "test.html")
     }
 
     $0.it("errors when loading absolute file outside of the selected path") {
-      try expect(try loader.loadTemplate(name: "/etc/hosts")).toThrow()
+      try expect(try environment.loadTemplate(name: "/etc/hosts")).toThrow()
     }
 
     $0.it("errors when loading relative file outside of the selected path") {
-      try expect(try loader.loadTemplate(name: "../LoaderSpec.swift")).toThrow()
+      try expect(try environment.loadTemplate(name: "../LoaderSpec.swift")).toThrow()
     }
   }
 }