inject runtime config only if FastBoot dependency exists

index.js

@@ -88,9 +88,7 @@ module.exports = {
     // - application has ember-cli-fastboot dependency.
     this._needsFastBootSupport = this._config.enabled &&
       this._config.delivery.includes('header') &&
-      // TODO: check if application has ember-cli-fastboot-dependency
-      // https://github.com/rwjblue/ember-cli-content-security-policy/issues/116
-      true;
+      new VersionChecker(this).for('ember-cli-fastboot').exists();
 
     // Run-time configuration is only needed for FastBoot support.
     if (!this._needsFastBootSupport) {

node-tests/e2e/fastboot-support-app-not-using-fastboot-test.js

@@ -0,0 +1,52 @@
+const expect = require('chai').expect;
+const AddonTestApp = require('ember-cli-addon-tests').AddonTestApp;
+const denodeify = require('denodeify');
+const request = denodeify(require('request'));
+
+function getRunTimeConfig(html) {
+  let encodedConfig = html.match(/<meta name="default\/config\/environment" content="(.*)" \/>/)[1];
+  return JSON.parse(decodeURIComponent(encodedConfig));
+}
+
+// ember-cli-version-checker reports wrong information if used together with ember-cli-addon-tests.
+describe.skip('e2e: fastboot integration if consumer does not use FastBoot', function() {
+  this.timeout(300000);
+
+  let app;
+
+  before(async function() {
+    app = new AddonTestApp();
+
+    await app.create('default', {
+      noFixtures: true,
+      skipNpm: true,
+    });
+
+    await app.editPackageJSON(pkg => {
+      delete pkg.devDependencies['ember-cli-fastboot'];
+      delete pkg.devDependencies['fastboot-app-server'];
+    });
+
+    await app.run('npm', 'install');
+
+    await app.startServer();
+  });
+
+  after(async function() {
+    await app.stopServer();
+  });
+
+  it('does not push run-time configuration into app if app does not use FastBoot', async function() {
+    let response = await request({
+      url: 'http://localhost:49741',
+      headers: {
+        'Accept': 'text/html'
+      }
+    });
+
+    expect(response.statusCode).to.equal(200);
+
+    let runTimeConfig = getRunTimeConfig(response.body);
+    expect(runTimeConfig).to.not.include.key('ember-cli-content-security-policy');
+  });
+});