diff --git a/common/lib/xmodule/xmodule/js/fixtures/crowdsource_hinter.html b/common/lib/xmodule/xmodule/js/fixtures/crowdsource_hinter.html
new file mode 100644
index 0000000000..02122017bd
--- /dev/null
+++ b/common/lib/xmodule/xmodule/js/fixtures/crowdsource_hinter.html
@@ -0,0 +1,52 @@
+<li id="vert-0" data-id="i4x://Me/19.002/crowdsource_hinter/crowdsource_hinter_def7a1142dd0">
+    
+
+<section class="xmodule_display xmodule_CrowdsourceHinterModule" data-type="Hinter" id="hinter-root">
+    
+
+<section class="xmodule_display xmodule_CapaModule" data-type="Problem" id="problem">
+  <section id="problem_i4x-Me-19_002-problem-Numerical_Input" class="problems-wrapper" data-problem-id="i4x://Me/19.002/problem/Numerical_Input" data-url="/courses/Me/19.002/Test/modx/i4x://Me/19.002/problem/Numerical_Input" data-progress_status="done" data-progress_detail="1/1">
+
+
+    <h2 class="problem-header">
+      Numerical Input
+    </h2>
+
+    <section class="problem-progress">(1/1 points)</section>
+
+    <section class="problem">
+      <div><p>The answer is 2*x^2*y + 5
+          </p><span><br><span> Answer =</span>
+          <section id="inputtype_i4x-Me-19_002-problem-Numerical_Input_2_1" class="text-input-dynamath capa_inputtype ">
+            <div class="correct " id="status_i4x-Me-19_002-problem-Numerical_Input_2_1">
+              <input type="text" name="input_i4x-Me-19_002-problem-Numerical_Input_2_1" id="input_i4x-Me-19_002-problem-Numerical_Input_2_1" aria-describedby="answer_i4x-Me-19_002-problem-Numerical_Input_2_1" value="2*x^2*y +5" class="math" size="40">
+
+        </div></section></span>
+
+        <input type="file" />
+
+        <section class="solution-span"><span id="solution_i4x-Me-19_002-problem-Numerical_Input_solution_1"></span></section></div>
+
+      <section class="action">
+        <input type="hidden" name="problem_id" value="Numerical Input">
+
+        <input class="check Check" type="button" value="Check">
+        <button class="show"><span class="show-label">Show Answer(s)</span> <span class="sr">(for question(s) above - adjacent to each field)</span></button>
+      </section>
+    </section>
+  </section>
+
+</section>
+
+
+
+<div id="i4x_Me_19_002_problem_Numerical_Input_setup"></div>
+
+
+
+<section class="crowdsource-wrapper" data-url="/courses/Me/19.002/Test/modx/i4x://Me/19.002/crowdsource_hinter/crowdsource_hinter_def7a1142dd0" data-child-url="/courses/Me/19.002/Test/modx/i4x://Me/19.002/problem/Numerical_Input" style="display: none;"> </section>
+</section>
+
+
+
+</li>
\ No newline at end of file
diff --git a/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee b/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
index 33d74e2335..111174a0b4 100644
--- a/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
+++ b/common/lib/xmodule/xmodule/js/spec/capa/display_spec.coffee
@@ -125,9 +125,10 @@ describe 'Problem', ->
         expect(@problem.bind).toHaveBeenCalled()
 
   describe 'check_fd', ->
-    xit 'should have specs written for this functionality', ->
+    xit 'should have more specs written for this functionality', ->
       expect(false)
 
+
   describe 'check', ->
     beforeEach ->
       @problem = new Problem($('.xmodule_display'))
@@ -137,6 +138,15 @@ describe 'Problem', ->
       @problem.check()
       expect(Logger.log).toHaveBeenCalledWith 'problem_check', 'foo=1&bar=2'
 
+    it 'log the problem_graded event, after the problem is done grading.', ->
+      spyOn($, 'postWithPrefix').andCallFake (url, answers, callback) ->
+        response = 
+          success: 'correct'
+          contents: 'mock grader response'
+        callback(response)
+      @problem.check()
+      expect(Logger.log).toHaveBeenCalledWith 'problem_graded', ['foo=1&bar=2', 'mock grader response'], @problem.url
+
     it 'submit the answer for check', ->
       spyOn $, 'postWithPrefix'
       @problem.check()
diff --git a/common/lib/xmodule/xmodule/js/spec/crowdsource_hinter/display_spec.coffee b/common/lib/xmodule/xmodule/js/spec/crowdsource_hinter/display_spec.coffee
new file mode 100644
index 0000000000..917741f8af
--- /dev/null
+++ b/common/lib/xmodule/xmodule/js/spec/crowdsource_hinter/display_spec.coffee
@@ -0,0 +1,54 @@
+describe 'Crowdsourced hinter', ->  
+  beforeEach ->
+    window.update_schematics = ->
+    jasmine.stubRequests()
+    # note that the fixturesPath is set in spec/helper.coffee
+    loadFixtures 'crowdsource_hinter.html'
+    @hinter = new Hinter($('#hinter-root'))
+
+  describe 'high-level integration tests', ->
+    # High-level, happy-path tests for integration with capa problems.
+    beforeEach ->
+      # Make a more thorough $.postWithPrefix mock.
+      spyOn($, 'postWithPrefix').andCallFake( ->
+        last_argument = arguments[arguments.length - 1]
+        if typeof last_argument == 'function'
+          response = 
+            success: 'incorrect'
+            contents: 'mock grader response'
+          last_argument(response)
+      )
+      @problem = new Problem($('#problem'))
+      @problem.bind()
+
+    it 'knows when a capa problem is graded, using check.', ->
+      @problem.answers = 'test answer'
+      @problem.check()
+      expect($.postWithPrefix).toHaveBeenCalledWith("#{@hinter.url}/get_hint", 'test answer', jasmine.any(Function))
+
+    it 'knows when a capa problem is graded usig check_fd.', ->
+      spyOn($, 'ajaxWithPrefix').andCallFake((url, settings) ->
+        response = 
+          success: 'incorrect'
+          contents: 'mock grader response'
+        settings.success(response)
+      )
+      @problem.answers = 'test answer'
+      @problem.check_fd()
+      expect($.postWithPrefix).toHaveBeenCalledWith("#{@hinter.url}/get_hint", 'test answer', jasmine.any(Function))
+
+  describe 'capture_problem', ->
+    beforeEach ->
+      spyOn($, 'postWithPrefix').andReturn(null)
+
+    it 'gets hints for an incorrect answer', ->
+      data = ['some answers', '<thing class="incorrect">']
+      @hinter.capture_problem('problem_graded', data, 'fake element')
+      expect($.postWithPrefix).toHaveBeenCalledWith("#{@hinter.url}/get_hint", 'some answers', jasmine.any(Function))
+
+    it 'gets feedback for a correct answer', ->
+      data = ['some answers', '<thing class="correct">']
+      @hinter.capture_problem('problem_graded', data, 'fake element')
+      expect($.postWithPrefix).toHaveBeenCalledWith("#{@hinter.url}/get_feedback", 'some answers', jasmine.any(Function))
+
+
diff --git a/common/lib/xmodule/xmodule/js/src/capa/display.coffee b/common/lib/xmodule/xmodule/js/src/capa/display.coffee
index ab64617644..61df101d08 100644
--- a/common/lib/xmodule/xmodule/js/src/capa/display.coffee
+++ b/common/lib/xmodule/xmodule/js/src/capa/display.coffee
@@ -19,7 +19,6 @@ class @Problem
 
     problem_prefix = @element_id.replace(/problem_/,'')
     @inputs = @$("[id^=input_#{problem_prefix}_]")
-
     @$('section.action input:button').click @refreshAnswers
     @$('section.action input.check').click @check_fd
     @$('section.action input.reset').click @reset
diff --git a/common/lib/xmodule/xmodule/js/src/crowdsource_hinter/display.coffee b/common/lib/xmodule/xmodule/js/src/crowdsource_hinter/display.coffee
index 2e99b107f9..c53a2e2066 100644
--- a/common/lib/xmodule/xmodule/js/src/crowdsource_hinter/display.coffee
+++ b/common/lib/xmodule/xmodule/js/src/crowdsource_hinter/display.coffee
@@ -96,7 +96,7 @@ class @Hinter
       $(obj).css('margin-top', (viewbox_height - view_height) + 'px')
     )
 
-  render: (content) =>
+  render: (content) ->
     if content
       # Trim leading and trailing whitespace
       content = content.replace /^\s+|\s+$/g, ""