diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -62,6 +62,7 @@
     'ArcanistConfigurationDrivenUnitTestEngine' => 'unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php',
     'ArcanistConfigurationManager' => 'configuration/ArcanistConfigurationManager.php',
     'ArcanistConsoleLintRenderer' => 'lint/renderer/ArcanistConsoleLintRenderer.php',
+    'ArcanistConsoleUnitRenderer' => 'unit/renderer/ArcanistConsoleUnitRenderer.php',
     'ArcanistConstructorParenthesesXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistConstructorParenthesesXHPASTLinterRule.php',
     'ArcanistControlStatementSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistControlStatementSpacingXHPASTLinterRule.php',
     'ArcanistCoverWorkflow' => 'workflow/ArcanistCoverWorkflow.php',
@@ -142,6 +143,7 @@
     'ArcanistJSONLintRenderer' => 'lint/renderer/ArcanistJSONLintRenderer.php',
     'ArcanistJSONLinter' => 'lint/linter/ArcanistJSONLinter.php',
     'ArcanistJSONLinterTestCase' => 'lint/linter/__tests__/ArcanistJSONLinterTestCase.php',
+    'ArcanistJSONUnitRenderer' => 'unit/renderer/ArcanistJSONUnitRenderer.php',
     'ArcanistJscsLinter' => 'lint/linter/ArcanistJscsLinter.php',
     'ArcanistJscsLinterTestCase' => 'lint/linter/__tests__/ArcanistJscsLinterTestCase.php',
     'ArcanistKeywordCasingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistKeywordCasingXHPASTLinterRule.php',
@@ -182,6 +184,7 @@
     'ArcanistNoLintLinterTestCase' => 'lint/linter/__tests__/ArcanistNoLintLinterTestCase.php',
     'ArcanistNoParentScopeXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistNoParentScopeXHPASTLinterRule.php',
     'ArcanistNoneLintRenderer' => 'lint/renderer/ArcanistNoneLintRenderer.php',
+    'ArcanistNoneUnitRenderer' => 'unit/renderer/ArcanistNoneUnitRenderer.php',
     'ArcanistObjectOperatorSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistObjectOperatorSpacingXHPASTLinterRule.php',
     'ArcanistPEP8Linter' => 'lint/linter/ArcanistPEP8Linter.php',
     'ArcanistPEP8LinterTestCase' => 'lint/linter/__tests__/ArcanistPEP8LinterTestCase.php',
@@ -249,11 +252,11 @@
     'ArcanistTodoCommentXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistTodoCommentXHPASTLinterRule.php',
     'ArcanistTodoWorkflow' => 'workflow/ArcanistTodoWorkflow.php',
     'ArcanistUSEnglishTranslation' => 'internationalization/ArcanistUSEnglishTranslation.php',
+    'ArcanistUglyJSONUnitRenderer' => 'unit/renderer/ArcanistUglyJSONUnitRenderer.php',
     'ArcanistUnableToParseXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUnableToParseXHPASTLinterRule.php',
     'ArcanistUnaryPostfixExpressionSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUnaryPostfixExpressionSpacingXHPASTLinterRule.php',
     'ArcanistUnaryPrefixExpressionSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUnaryPrefixExpressionSpacingXHPASTLinterRule.php',
     'ArcanistUndeclaredVariableXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistUndeclaredVariableXHPASTLinterRule.php',
-    'ArcanistUnitConsoleRenderer' => 'unit/renderer/ArcanistUnitConsoleRenderer.php',
     'ArcanistUnitRenderer' => 'unit/renderer/ArcanistUnitRenderer.php',
     'ArcanistUnitTestEngine' => 'unit/engine/ArcanistUnitTestEngine.php',
     'ArcanistUnitTestResult' => 'unit/ArcanistUnitTestResult.php',
@@ -351,6 +354,7 @@
     'ArcanistConfigurationDrivenUnitTestEngine' => 'ArcanistUnitTestEngine',
     'ArcanistConfigurationManager' => 'Phobject',
     'ArcanistConsoleLintRenderer' => 'ArcanistLintRenderer',
+    'ArcanistConsoleUnitRenderer' => 'ArcanistUnitRenderer',
     'ArcanistConstructorParenthesesXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistControlStatementSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistCoverWorkflow' => 'ArcanistWorkflow',
@@ -431,6 +435,7 @@
     'ArcanistJSONLintRenderer' => 'ArcanistLintRenderer',
     'ArcanistJSONLinter' => 'ArcanistLinter',
     'ArcanistJSONLinterTestCase' => 'ArcanistLinterTestCase',
+    'ArcanistJSONUnitRenderer' => 'ArcanistUnitRenderer',
     'ArcanistJscsLinter' => 'ArcanistExternalLinter',
     'ArcanistJscsLinterTestCase' => 'ArcanistExternalLinterTestCase',
     'ArcanistKeywordCasingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
@@ -471,6 +476,7 @@
     'ArcanistNoLintLinterTestCase' => 'ArcanistLinterTestCase',
     'ArcanistNoParentScopeXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistNoneLintRenderer' => 'ArcanistLintRenderer',
+    'ArcanistNoneUnitRenderer' => 'ArcanistUnitRenderer',
     'ArcanistObjectOperatorSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistPEP8Linter' => 'ArcanistExternalLinter',
     'ArcanistPEP8LinterTestCase' => 'ArcanistExternalLinterTestCase',
@@ -538,11 +544,11 @@
     'ArcanistTodoCommentXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistTodoWorkflow' => 'ArcanistWorkflow',
     'ArcanistUSEnglishTranslation' => 'PhutilTranslation',
+    'ArcanistUglyJSONUnitRenderer' => 'ArcanistUnitRenderer',
     'ArcanistUnableToParseXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistUnaryPostfixExpressionSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistUnaryPrefixExpressionSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistUndeclaredVariableXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
-    'ArcanistUnitConsoleRenderer' => 'ArcanistUnitRenderer',
     'ArcanistUnitRenderer' => 'Phobject',
     'ArcanistUnitTestEngine' => 'Phobject',
     'ArcanistUnitTestResult' => 'Phobject',
diff --git a/src/unit/renderer/ArcanistUnitConsoleRenderer.php b/src/unit/renderer/ArcanistConsoleUnitRenderer.php
rename from src/unit/renderer/ArcanistUnitConsoleRenderer.php
rename to src/unit/renderer/ArcanistConsoleUnitRenderer.php
--- a/src/unit/renderer/ArcanistUnitConsoleRenderer.php
+++ b/src/unit/renderer/ArcanistConsoleUnitRenderer.php
@@ -1,6 +1,10 @@
 <?php
 
-final class ArcanistUnitConsoleRenderer extends ArcanistUnitRenderer {
+final class ArcanistConsoleUnitRenderer extends ArcanistUnitRenderer {
+
+  public function getId() {
+    return 'full';
+  }
 
   public function renderUnitResult(ArcanistUnitTestResult $result) {
     $result_code = $result->getResult();
diff --git a/src/unit/renderer/ArcanistJSONUnitRenderer.php b/src/unit/renderer/ArcanistJSONUnitRenderer.php
new file mode 100644
--- /dev/null
+++ b/src/unit/renderer/ArcanistJSONUnitRenderer.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * This Renderer uses a bit of hack since it doesn't render the JSON
+ * progessively. It uses the postamble to conver the results.
+ */
+final class ArcanistJSONUnitRenderer extends ArcanistUnitRenderer {
+
+  private $results = array();
+
+  public function getId() {
+    return 'json';
+  }
+
+  public function renderUnitResult(ArcanistUnitTestResult $result) {
+    array_push($this->results, $result);
+
+    return '';
+  }
+
+  public function renderPostamble() {
+    assert_instances_of($this->results, 'ArcanistUnitTestResult');
+    $data = array_values(mpull($this->results, 'toDictionary'));
+    return id(new PhutilJSON())->encodeFormatted($data);
+  }
+
+}
diff --git a/src/unit/renderer/ArcanistNoneUnitRenderer.php b/src/unit/renderer/ArcanistNoneUnitRenderer.php
new file mode 100644
--- /dev/null
+++ b/src/unit/renderer/ArcanistNoneUnitRenderer.php
@@ -0,0 +1,13 @@
+<?php
+
+final class ArcanistNoneUnitRenderer extends ArcanistUnitRenderer {
+
+  public function getId() {
+    return 'none';
+  }
+
+  public function renderUnitResult(ArcanistUnitTestResult $result) {
+    return '';
+  }
+
+}
diff --git a/src/unit/renderer/ArcanistUglyJSONUnitRenderer.php b/src/unit/renderer/ArcanistUglyJSONUnitRenderer.php
new file mode 100644
--- /dev/null
+++ b/src/unit/renderer/ArcanistUglyJSONUnitRenderer.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * This Renderer uses a bit of hack since it doesn't render the JSON
+ * progessively. It uses the postamble to conver the results.
+ */
+final class ArcanistUglyJSONUnitRenderer extends ArcanistUnitRenderer {
+
+  private $results = array();
+
+  public function getId() {
+    return 'ugly';
+  }
+
+  public function renderUnitResult(ArcanistUnitTestResult $result) {
+    array_push($this->results, $result);
+
+    return '';
+  }
+
+  public function renderPostamble() {
+    assert_instances_of($this->results, 'ArcanistUnitTestResult');
+    $data = array_values(mpull($this->results, 'toDictionary'));
+    return phutil_json_encode($data);
+  }
+
+}
diff --git a/src/unit/renderer/ArcanistUnitRenderer.php b/src/unit/renderer/ArcanistUnitRenderer.php
--- a/src/unit/renderer/ArcanistUnitRenderer.php
+++ b/src/unit/renderer/ArcanistUnitRenderer.php
@@ -1,5 +1,33 @@
 <?php
 
 abstract class ArcanistUnitRenderer extends Phobject {
+
+  final public static function loadAllRenderers() {
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getId')
+      ->execute();
+  }
+
+  final public static function getRendererById($id) {
+    $renderers = self::loadAllRenderers();
+    if ($renderers[$id]) {
+        return $renderers[$id];
+    } else {
+        throw new Exception('Renderer, '.$id.', does not exist.');
+    }
+  }
+
+  abstract public function getId();
+
+  public function renderPreamble() {
+    return '';
+  }
+
   abstract public function renderUnitResult(ArcanistUnitTestResult $result);
+
+  public function renderPostamble() {
+    return '';
+  }
+
 }
diff --git a/src/workflow/ArcanistUnitWorkflow.php b/src/workflow/ArcanistUnitWorkflow.php
--- a/src/workflow/ArcanistUnitWorkflow.php
+++ b/src/workflow/ArcanistUnitWorkflow.php
@@ -69,9 +69,6 @@
           'Show a detailed coverage report on the CLI. Implies %s.',
           '--coverage'),
       ),
-      'json' => array(
-        'help' => pht('Report results in JSON format.'),
-      ),
       'output' => array(
         'param' => 'format',
         'help' => pht(
@@ -79,10 +76,6 @@
           "With 'json', report results in JSON format. ".
           "With 'ugly', use uglier (but more efficient) JSON formatting. ".
           "With 'none', don't print results."),
-        'conflicts' => array(
-          'json' => pht('Only one output format allowed'),
-          'ugly' => pht('Only one output format allowed'),
-        ),
       ),
       'target' => array(
         'param' => 'phid',
@@ -96,11 +89,6 @@
           'rev' => pht('%s runs all tests.', '--everything'),
         ),
       ),
-      'ugly' => array(
-        'help' => pht(
-          'With %s, use uglier (but more efficient) formatting.',
-          '--json'),
-      ),
       '*' => 'paths',
     );
   }
@@ -153,7 +141,9 @@
     }
     $this->engine->setArguments($this->getPassthruArgumentsAsMap('unit'));
 
-    $renderer = new ArcanistUnitConsoleRenderer();
+    // Get renderer based on '--output' argument
+    $renderer = ArcanistUnitRenderer::getRendererById($this->getOutputFormat());
+
     $this->engine->setRenderer($renderer);
 
     $enable_coverage = null; // Means "default".
@@ -165,7 +155,7 @@
     }
     $this->engine->setEnableCoverage($enable_coverage);
 
-    // Enable possible async tests only for 'arc diff' not 'arc unit'
+    // Enable possible async tests only for 'arc diff' not 'arc unit'.
     if ($this->getParentWorkflow()) {
       $this->engine->setEnableAsyncTests(true);
     } else {
@@ -178,24 +168,30 @@
 
     $this->testResults = $results;
 
-    $console = PhutilConsole::getConsole();
-
-    $output_format = $this->getOutputFormat();
-
-    if ($output_format !== 'full') {
-      $console->disableOut();
-    }
-
     $unresolved = array();
     $coverage = array();
+    $overall_result = self::RESULT_OKAY;
+    // Gather unresolved tests and coverage while determining the
+    // 'overall_result'.
+
     foreach ($results as $result) {
       $result_code = $result->getResult();
-      if ($this->engine->shouldEchoTestResults()) {
-        $console->writeOut('%s', $renderer->renderUnitResult($result));
-      }
       if ($result_code != ArcanistUnitTestResult::RESULT_PASS) {
         $unresolved[] = $result;
       }
+
+      // Note: This means as soon as a RESULT_FAIL/BROKEN/UNSOUND are found,
+      // they persist as the '$overall_result'.
+      if ($overall_result != self::RESULT_FAIL) {
+        $result_code = $result->getResult();
+        if ($result_code == ArcanistUnitTestResult::RESULT_FAIL ||
+            $result_code == ArcanistUnitTestResult::RESULT_BROKEN) {
+          $overall_result = self::RESULT_FAIL;
+        } else if ($result_code == ArcanistUnitTestResult::RESULT_UNSOUND) {
+          $overall_result = self::RESULT_UNSOUND;
+        }
+      }
+
       if ($result->getCoverage()) {
         foreach ($result->getCoverage() as $file => $report) {
           $coverage[$file][] = $report;
@@ -203,6 +199,25 @@
       }
     }
 
+    $this->unresolvedTests = $unresolved;
+
+    // Set up output methods.
+    $console = PhutilConsole::getConsole();
+
+    // Write out Unit Test results to console or file.
+    if ($this->engine->shouldEchoTestResults()) {
+      $preamble = $renderer->renderPreamble();
+      $console->writeOut('%s', $preamble);
+
+      foreach ($results as $result) {
+        $console->writeOut('%s', $renderer->renderUnitResult($result));
+      }
+
+      $postamble = $renderer->renderPostamble();
+      $console->writeOut('%s', $postamble);
+    }
+
+    // Process and render coverage results.
     if ($coverage) {
       $file_coverage = array_fill_keys(
         $paths,
@@ -243,41 +258,6 @@
       }
     }
 
-    $this->unresolvedTests = $unresolved;
-
-    $overall_result = self::RESULT_OKAY;
-    foreach ($results as $result) {
-      $result_code = $result->getResult();
-      if ($result_code == ArcanistUnitTestResult::RESULT_FAIL ||
-          $result_code == ArcanistUnitTestResult::RESULT_BROKEN) {
-        $overall_result = self::RESULT_FAIL;
-        break;
-      } else if ($result_code == ArcanistUnitTestResult::RESULT_UNSOUND) {
-        $overall_result = self::RESULT_UNSOUND;
-      }
-    }
-
-    if ($output_format !== 'full') {
-      $console->enableOut();
-    }
-    $data = array_values(mpull($results, 'toDictionary'));
-    switch ($output_format) {
-      case 'ugly':
-        $console->writeOut('%s', json_encode($data));
-        break;
-      case 'json':
-        $json = new PhutilJSON();
-        $console->writeOut('%s', $json->encodeFormatted($data));
-        break;
-      case 'full':
-        // already printed
-        break;
-      case 'none':
-        // do nothing
-        break;
-    }
-
-
     $target_phid = $this->getArgument('target');
     if ($target_phid) {
       $this->uploadTestResults($target_phid, $overall_result, $results);
@@ -336,12 +316,6 @@
   }
 
   private function getOutputFormat() {
-    if ($this->getArgument('ugly')) {
-      return 'ugly';
-    }
-    if ($this->getArgument('json')) {
-      return 'json';
-    }
     $format = $this->getArgument('output');
     $known_formats = array(
       'none' => 'none',