diff --git a/packages/ace-core/src/core/ace.js b/packages/ace-core/src/core/ace.js
index 78874748..32661692 100644
--- a/packages/ace-core/src/core/ace.js
+++ b/packages/ace-core/src/core/ace.js
@@ -59,7 +59,7 @@ module.exports = function ace(epubPath, options) {
     // Process the Results
     .then((report) => {
       if (options.outdir === undefined) {
-        return winston.info(JSON.stringify(report.json, null, '  '));
+        return process.stdout.write(JSON.stringify(report.json, null, '  '));
       }
       return Promise.all([
         report.copyData(options.outdir),
diff --git a/tests/__tests__/__snapshots__/cli.test.js.snap b/tests/__tests__/__snapshots__/cli.test.js.snap
index ea765c2d..28072511 100644
--- a/tests/__tests__/__snapshots__/cli.test.js.snap
+++ b/tests/__tests__/__snapshots__/cli.test.js.snap
@@ -1,6 +1,16 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`test existing output 1`] = `
+exports[`Running the CLI on an unexisting document should fail 1`] = `
+"info:    Closing logs.
+Re-run Ace using the --verbose option to enable full debug logging."
+`;
+
+exports[`Running the CLI on an unexisting document should fail 2`] = `
+"error:   Couldn’t find EPUB file 'unexisting.epub'
+"
+`;
+
+exports[`Running the CLI with -o pointing to an existing directory should fail 1`] = `
 "warn:    Output directory is not empty.
 
   Running Ace would override the following files or directories:
@@ -14,7 +24,9 @@ exports[`test existing output 1`] = `
 "
 `;
 
-exports[`test help 1`] = `
+exports[`Running the CLI with no input should fail 1`] = `"error:   Input required"`;
+
+exports[`Running the CLI with no input should fail 2`] = `
 "
   Ace by DAISY, an Accessibility Checker for EPUB
 
@@ -38,9 +50,7 @@ exports[`test help 1`] = `
 "
 `;
 
-exports[`test no input 1`] = `"error:   Input required"`;
-
-exports[`test no input 2`] = `
+exports[`Running the CLI with the -h option should print help 1`] = `
 "
   Ace by DAISY, an Accessibility Checker for EPUB
 
@@ -63,13 +73,3 @@ exports[`test no input 2`] = `
     $ ace -o out ~/Documents/book.epub
 "
 `;
-
-exports[`test unexisting input 1`] = `
-"info:    Closing logs.
-Re-run Ace using the --verbose option to enable full debug logging."
-`;
-
-exports[`test unexisting input 2`] = `
-"error:   Couldn’t find EPUB file 'unexisting.epub'
-"
-`;
diff --git a/tests/__tests__/cli.test.js b/tests/__tests__/cli.test.js
index 39a8424d..3439a4c8 100644
--- a/tests/__tests__/cli.test.js
+++ b/tests/__tests__/cli.test.js
@@ -5,47 +5,60 @@ const pkg = require('../../packages/ace-core/package');
 
 const path = require('path');
 
+describe('Running the CLI', () => {
+  test('with no input should fail', () => {
+    const { stdout, stderr, status } = ace([]);
+    expect(status).toBe(1);
+    expect(stderr.trim()).toMatchSnapshot();
+    expect(stdout).toMatchSnapshot();
+  });
+  
+  test('with the -h option should print help', () => {
+    const { stdout, stderr, status } = ace(['-h']);
+    expect(status).toBe(0);
+    expect(stderr).toBe('');
+    expect(stdout).toMatchSnapshot();
+  });
+  
+  test('with the -v option should print the version number', () => {
+    const { stdout, stderr, status } = ace(['-v']);
+    expect(status).toBe(0);
+    expect(stderr).toBe('');
+    expect(stdout.trim()).toBe(pkg.version);
+  });
+  
+  test('with the --version option should print the version number', () => {
+    const { stdout, stderr, status } = ace(['--version']);
+    expect(status).toBe(0);
+    expect(stderr).toBe('');
+    expect(stdout.trim()).toBe(pkg.version);
+  });
+  
+  test('on an unexisting document should fail', () => {
+    const { stdout, stderr, status } = ace(['unexisting.epub']);
+    expect(status).toBe(1);
+    expect(stdout.trim()).toMatchSnapshot();
+    expect(stderr).toMatchSnapshot();
+  });
+  
+  test('with -o pointing to an existing directory should fail', () => {
+    const { stdout, stderr, status } = ace(['-o', 'report', 'foo'], {
+      cwd: path.resolve(__dirname, '../data'),
+    });
+    expect(status).toBe(1);
+    expect(stderr).toBe('');
+    expect(stdout).toMatchSnapshot();
+  });
 
-test('test no input', () => {
-  const { stdout, stderr, status } = ace([]);
-  expect(status).toBe(1);
-  expect(stderr.trim()).toMatchSnapshot();
-  expect(stdout).toMatchSnapshot();
-});
-
-test('test help', () => {
-  const { stdout, stderr, status } = ace(['-h']);
-  expect(status).toBe(0);
-  expect(stderr).toBe('');
-  expect(stdout).toMatchSnapshot();
-});
-
-test('test version -v', () => {
-  const { stdout, stderr, status } = ace(['-v']);
-  expect(status).toBe(0);
-  expect(stderr).toBe('');
-  expect(stdout.trim()).toBe(pkg.version);
-});
-
-test('test version --version', () => {
-  const { stdout, stderr, status } = ace(['--version']);
-  expect(status).toBe(0);
-  expect(stderr).toBe('');
-  expect(stdout.trim()).toBe(pkg.version);
-});
-
-test('test unexisting input', () => {
-  const { stdout, stderr, status } = ace(['unexisting.epub']);
-  expect(status).toBe(1);
-  expect(stdout.trim()).toMatchSnapshot();
-  expect(stderr).toMatchSnapshot();
-});
-
-test('test existing output', () => {
-  const { stdout, stderr, status } = ace(['-o', 'report', 'foo'], {
-    cwd: path.resolve(__dirname, '../data'),
+  test('with --silent and no --outdir should print the JSON report to standard output', () => {
+    const { stdout, stderr, status } = ace(['-s', 'base-epub-30'], {
+      cwd: path.resolve(__dirname, '../data'),
+    });
+    expect(status).toBe(0);
+    expect(stderr).toBe('');
+    expect(() => JSON.parse(stdout)).not.toThrow(SyntaxError);
+    const res = JSON.parse(stdout);
+    expect(res).toMatchObject({ '@type': 'earl:report' });
   });
-  expect(status).toBe(1);
-  expect(stderr).toBe('');
-  expect(stdout).toMatchSnapshot();
 });
+