try configuring jest to run faster

https://stackoverflow.com/questions/45087018/jest-simple-tests-are-slow

https://itnext.io/how-to-make-your-sluggish-jest-v23-tests-go-faster-1d4f3388bcdd

jestjs/jest#7963

.devcontainer/opinion-ate.steps.txt

@@ -2,4 +2,20 @@
 === [opinion-ate steps] 
 ================================================================================
 
-https://outsidein.dev/vue/2-project-setup.html#setting-up-development-environment
+https://outsidein.dev/vue/2-project-setup.html#setting-up-development-environment
+
+
+1. create app
+vue create opinion-ate
+
+2. set up autoformatting and linting
+yarn lint
+
+3. run tests
+yarn test:unit
+
+# tried to improve test performance per these links:
+https://stackoverflow.com/questions/45087018/jest-simple-tests-are-slow
+https://itnext.io/how-to-make-your-sluggish-jest-v23-tests-go-faster-1d4f3388bcdd
+https://github.com/facebook/jest/issues/7963
+

client/package.json

@@ -39,5 +39,21 @@
       "vue-cli-service lint",
       "git add"
     ]
+  },
+  "jest": {
+    "testEnvironment": "node",
+    "modulePaths": [
+      "<rootDir>/src",
+      "<rootDir>/node_modules"
+    ],
+    "testPathIgnorePatterns": [
+      ".git/.*",
+      "node_modules/.*",
+      "src/.*"
+    ],
+    "transformIgnorePatterns": [
+      "node_modules/.*",
+      ".*\\.js"
+    ]
   }
 }

client/tests/unit/example.spec.js

@@ -7,6 +7,7 @@ describe('HelloWorld.vue', () => {
     const wrapper = shallowMount(HelloWorld, {
       propsData: {msg},
     });
+
     expect(wrapper.text()).toMatch(msg);
   });
 });