build: add a script to flag missing unit tests in MDC packages

package.json

@@ -45,7 +45,8 @@
     "approve-size-tests": "node ./scripts/approve-size-golden.js",
     "integration-tests": "bazel test --test_tag_filters=-view-engine-only --build_tests_only -- //integration/... -//integration/size-test/...",
     "integration-tests:view-engine": "bazel test --test_tag_filters=view-engine-only --build_tests_only -- //integration/... -//integration/size-test/...",
-    "integration-tests:size-test": "bazel test //integration/size-test/..."
+    "integration-tests:size-test": "bazel test //integration/size-test/...",
+    "check-mdc-tests": "ts-node --project scripts/tsconfig.json scripts/check-mdc-tests.ts"
   },
   "version": "11.0.0-next.0",
   "dependencies": {

scripts/check-mdc-tests.ts

@@ -0,0 +1,87 @@
+import {readdirSync, readFileSync} from 'fs';
+import {join, basename} from 'path';
+import {sync as glob} from 'glob';
+import chalk from 'chalk';
+import * as ts from 'typescript';
+
+const srcDirectory = join(__dirname, '../src');
+const materialDirectories = readdirSync(join(srcDirectory, 'material'));
+
+// Goes through all the unit tests and flags the ones that don't exist in the MDC components.
+readdirSync(join(srcDirectory, 'material-experimental'), {withFileTypes: true})
+  .reduce((matches, entity) => {
+    // Go through all the `material-experimental` directories and match them to ones in `material`.
+    if (entity.isDirectory()) {
+      const materialName = entity.name.replace(/^mdc-/, '');
+
+      if (materialDirectories.indexOf(materialName) > -1) {
+        matches.set(materialName, entity.name);
+      }
+    }
+
+    return matches;
+  }, new Map<string, string>())
+  .forEach((mdcPackage, materialPackage) => {
+    const mdcTestFiles = getUnitTestFiles(`material-experimental/${mdcPackage}`);
+
+    // MDC entry points that don't have test files may not have been implemented yet.
+    if (mdcTestFiles.length > 0) {
+      // Filter out files that don't exist in the MDC package, allowing
+      // us to ignore some files which may not need to be ported to MDC.
+      const materialTestFiles = getUnitTestFiles(`material/${materialPackage}`).filter(path => {
+        const fileName = basename(path);
+        return mdcTestFiles.some(file => basename(file) === fileName);
+      });
+      const materialTests = getTestNames(materialTestFiles);
+      const mdcTests = getTestNames(mdcTestFiles);
+      const missingTests = materialTests.filter(test => !mdcTests.includes(test));
+
+      if (missingTests.length > 0) {
+        console.log(chalk.redBright(`\nMissing tests for ${mdcPackage}:`));
+        console.log(missingTests.join('\n'));
+      }
+    }
+  });
+
+/**
+ * Gets all the names of all unit test files inside a
+ * package name, excluding `testing` packages and e2e tests.
+ */
+function getUnitTestFiles(name: string): string[] {
+  return glob('{,!(testing)/**/}!(*.e2e).spec.ts', {
+    absolute: true,
+    cwd: join(srcDirectory, name)
+  });
+}
+
+/** Gets the name of all unit tests within a set of files. */
+function getTestNames(files: string[]): string[] {
+  const testNames: string[] = [];
+
+  files.forEach(file => {
+    const content = readFileSync(file, 'utf-8');
+    const sourceFile = ts.createSourceFile(file, content, ts.ScriptTarget.ES2015);
+
+    sourceFile.forEachChild(function walk(node: ts.Node) {
+      if (ts.isCallExpression(node) && ts.isIdentifier(node.expression) &&
+          node.expression.text === 'it') {
+        // Note that this is a little naive since it'll take the literal text of the test
+        // name expression which could include things like string concatenation. It's fine
+        // for the limited use cases of the script.
+        testNames.push(node.arguments[0].getText(sourceFile)
+          // Replace the quotes around the test name.
+          .replace(/^['`]|['`]$/g, '')
+          // Strip newlines followed by indentation.
+          .replace(/\n\s+/g, ' ')
+          // Strip escape characters.
+          .replace(/\\/g, '')
+          // Collapse concatenated strings.
+          .replace(/['`]\s+\+\s+['`]/g, ''));
+      } else {
+        node.forEachChild(walk);
+      }
+    });
+  });
+
+  return testNames;
+}

scripts/tsconfig.json

@@ -3,6 +3,7 @@
     "outDir": "../dist/dev-infra-scripts",
     "target": "es2015",
     "lib": ["es2016"],
+    "moduleResolution": "node",
     "types": ["node"],
     "strictNullChecks": true,
     "downlevelIteration": true