fix(testing): add general code tests, lost console methods

tests/__snapshots__/code.test.js.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`General code checks should only have specific console.[warn|log|info|error] methods: console methods 1`] = `
+Array [
+  "redux/common/reduxHelpers.js:167:    console.error(\`Error: Property \${prop} does not exist within the passed state.\`, state);",
+  "redux/common/reduxHelpers.js:171:    console.warn(\`Warning: Property \${prop} does not exist within the passed initialState.\`, initialState);",
+  "setupTests.js:70:  console.error = (message, ...args) => {",
+]
+`;

tests/code.test.js

@@ -0,0 +1,18 @@
+const { execSync } = require('child_process');
+
+describe('General code checks', () => {
+  const srcDir = 'src';
+
+  it('should only have specific console.[warn|log|info|error] methods', () => {
+    const output = execSync(
+      `echo "$(cd ./${srcDir} && git grep -n -E "(console.warn|console.log|console.info|console.error)")"`
+    );
+
+    expect(
+      output
+        .toString()
+        .trim()
+        .split(/[\n\r]/g)
+    ).toMatchSnapshot('console methods');
+  });
+});