Merge pull request #4 from getmimo/add-custom-test-runner

Add custom test runner

Author: littleStudent

dist/testrunner.js

@@ -0,0 +1,65 @@
+'use strict';
+const deepEqual = require('deep-equal');
+
+// The stack of beforeEach callbacks
+const beforeEachStack = [[]];
+// Runs every beforeEach callback in the stack
+const runEveryBeforeEach = () => {
+  beforeEachStack.forEach(level => level.forEach(cb => cb()));
+};
+const beforeEach = cb => {
+  beforeEachStack[beforeEachStack.length - 1].push(cb);
+};
+
+// Keeps some counters used to print the summary after the execution of a test suite is completed
+const summary = { success: true, testResults: [] };
+let tempResult = {};
+
+// Declares a test unit
+const test = (input, title, cb) => {
+  runEveryBeforeEach();
+  tempResult.input = input;
+  try {
+    cb(input);
+    summary.testResults.push({
+      title,
+      passed: true,
+      result: tempResult,
+    });
+    tempResult = {};
+  } catch (e) {
+    summary.success = false;
+    summary.testResults.push({
+      title,
+      passed: false,
+      result: tempResult,
+    });
+    tempResult = {};
+  }
+};
+
+// Prints the test summary and finishes the process with the appropriate exit code
+const end = () => {
+  console.log(`${JSON.stringify(summary)}`);
+  if (summary.fail > 0) process.exit(1);
+  process.exit(0);
+};
+
+// ASSERTIONS
+
+const isEqual = (actual, expected) => {
+  tempResult.actual = actual;
+  tempResult.expected = expected;
+  if (!deepEqual(actual, expected)) {
+    throw Error(actual);
+  }
+  return actual;
+};
+
+module.exports = {
+  test,
+  end,
+  beforeEach,
+  summary,
+  isEqual,
+};