finished ch12.4

.obsidian/workspace.json

@@ -24,6 +24,20 @@
           {
             "id": "53b36d00b704136e",
             "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "Tests.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "Tests"
+            }
+          },
+          {
+            "id": "ec34d2df2728a299",
+            "type": "leaf",
             "state": {
               "type": "markdown",
               "state": {
@@ -36,7 +50,7 @@
             }
           }
         ],
-        "currentTab": 1
+        "currentTab": 2
       }
     ],
     "direction": "vertical"
@@ -179,13 +193,14 @@
       "command-palette:Open command palette": false
     }
   },
-  "active": "53b36d00b704136e",
+  "active": "ec34d2df2728a299",
   "lastOpenFiles": [
+    "Writing_Tests.md",
+    "Tests.md",
+    "minigrep/README.md",
     "minigrep/src/lib.rs",
     "Test_Organization.md",
     "Test Controls.md",
-    "Tests.md",
-    "Writing_Tests.md",
     "Traits.md",
     "Modules and Use.md",
     "Modules.md",