Index: frontend/node_modules/test-exclude/index.js
===================================================================
--- frontend/node_modules/test-exclude/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/test-exclude/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,161 @@
+'use strict';
+
+const path = require('path');
+const { promisify } = require('util');
+const glob = promisify(require('glob'));
+const minimatch = require('minimatch');
+const { defaults } = require('@istanbuljs/schema');
+const isOutsideDir = require('./is-outside-dir');
+
+class TestExclude {
+    constructor(opts = {}) {
+        Object.assign(
+            this,
+            {relativePath: true},
+            defaults.testExclude
+        );
+
+        for (const [name, value] of Object.entries(opts)) {
+            if (value !== undefined) {
+                this[name] = value;
+            }
+        }
+
+        if (typeof this.include === 'string') {
+            this.include = [this.include];
+        }
+
+        if (typeof this.exclude === 'string') {
+            this.exclude = [this.exclude];
+        }
+
+        if (typeof this.extension === 'string') {
+            this.extension = [this.extension];
+        } else if (this.extension.length === 0) {
+            this.extension = false;
+        }
+
+        if (this.include && this.include.length > 0) {
+            this.include = prepGlobPatterns([].concat(this.include));
+        } else {
+            this.include = false;
+        }
+
+        if (
+            this.excludeNodeModules &&
+            !this.exclude.includes('**/node_modules/**')
+        ) {
+            this.exclude = this.exclude.concat('**/node_modules/**');
+        }
+
+        this.exclude = prepGlobPatterns([].concat(this.exclude));
+
+        this.handleNegation();
+    }
+
+    /* handle the special case of negative globs
+     * (!**foo/bar); we create a new this.excludeNegated set
+     * of rules, which is applied after excludes and we
+     * move excluded include rules into this.excludes.
+     */
+    handleNegation() {
+        const noNeg = e => e.charAt(0) !== '!';
+        const onlyNeg = e => e.charAt(0) === '!';
+        const stripNeg = e => e.slice(1);
+
+        if (Array.isArray(this.include)) {
+            const includeNegated = this.include.filter(onlyNeg).map(stripNeg);
+            this.exclude.push(...prepGlobPatterns(includeNegated));
+            this.include = this.include.filter(noNeg);
+        }
+
+        this.excludeNegated = this.exclude.filter(onlyNeg).map(stripNeg);
+        this.exclude = this.exclude.filter(noNeg);
+        this.excludeNegated = prepGlobPatterns(this.excludeNegated);
+    }
+
+    shouldInstrument(filename, relFile) {
+        if (
+            this.extension &&
+            !this.extension.some(ext => filename.endsWith(ext))
+        ) {
+            return false;
+        }
+
+        let pathToCheck = filename;
+
+        if (this.relativePath) {
+            relFile = relFile || path.relative(this.cwd, filename);
+
+            // Don't instrument files that are outside of the current working directory.
+            if (isOutsideDir(this.cwd, filename)) {
+                return false;
+            }
+
+            pathToCheck = relFile.replace(/^\.[\\/]/, ''); // remove leading './' or '.\'.
+        }
+
+        const dot = { dot: true };
+        const matches = pattern => minimatch(pathToCheck, pattern, dot);
+        return (
+            (!this.include || this.include.some(matches)) &&
+            (!this.exclude.some(matches) || this.excludeNegated.some(matches))
+        );
+    }
+
+    globSync(cwd = this.cwd) {
+        const globPatterns = getExtensionPattern(this.extension || []);
+        const globOptions = { cwd, nodir: true, dot: true };
+        /* If we don't have any excludeNegated then we can optimize glob by telling
+         * it to not iterate into unwanted directory trees (like node_modules). */
+        if (this.excludeNegated.length === 0) {
+            globOptions.ignore = this.exclude;
+        }
+
+        return glob
+            .sync(globPatterns, globOptions)
+            .filter(file => this.shouldInstrument(path.resolve(cwd, file)));
+    }
+
+    async glob(cwd = this.cwd) {
+        const globPatterns = getExtensionPattern(this.extension || []);
+        const globOptions = { cwd, nodir: true, dot: true };
+        /* If we don't have any excludeNegated then we can optimize glob by telling
+         * it to not iterate into unwanted directory trees (like node_modules). */
+        if (this.excludeNegated.length === 0) {
+            globOptions.ignore = this.exclude;
+        }
+
+        const list = await glob(globPatterns, globOptions);
+        return list.filter(file => this.shouldInstrument(path.resolve(cwd, file)));
+    }
+}
+
+function prepGlobPatterns(patterns) {
+    return patterns.reduce((result, pattern) => {
+        // Allow gitignore style of directory exclusion
+        if (!/\/\*\*$/.test(pattern)) {
+            result = result.concat(pattern.replace(/\/$/, '') + '/**');
+        }
+
+        // Any rules of the form **/foo.js, should also match foo.js.
+        if (/^\*\*\//.test(pattern)) {
+            result = result.concat(pattern.replace(/^\*\*\//, ''));
+        }
+
+        return result.concat(pattern);
+    }, []);
+}
+
+function getExtensionPattern(extension) {
+    switch (extension.length) {
+        case 0:
+            return '**';
+        case 1:
+            return `**/*${extension[0]}`;
+        default:
+            return `**/*{${extension.join()}}`;
+    }
+}
+
+module.exports = TestExclude;