adds the ability to show code coverage via the gutter

lib/tester.js

@@ -177,8 +177,21 @@ class Tester {
           }
         }
       }
-      editor.decorateMarkerLayer(coveredLayer, {type: 'highlight', class: 'covered', onlyNonEmpty: true})
-      editor.decorateMarkerLayer(uncoveredLayer, {type: 'highlight', class: 'uncovered', onlyNonEmpty: true})
+
+      let type = atom.config.get("go-plus.test.coverageDisplayMode")
+      switch(type){
+        case "gutter":
+          type = "line-number"
+          break
+        case "highlight":
+          type = "highlight"
+          break
+        default:
+          type = "highlight"
+      }
+
+      editor.decorateMarkerLayer(coveredLayer, {type: type, class: 'covered', onlyNonEmpty: true})
+      editor.decorateMarkerLayer(uncoveredLayer, {type: type, class: 'uncovered', onlyNonEmpty: true})
     } catch (e) {
       console.log(e)
     }

package.json

@@ -168,12 +168,23 @@
           ],
           "order": 3
         },
+        "coverageDisplayMode": {
+          "title": "Coverage Display Mode",
+          "description": "Control the way that coverage is displayed in the editor: gutter, or highlight",
+          "type": "string",
+          "default": "highlight",
+          "enum":[
+            "highlight",
+            "gutter"
+          ],
+          "order": 4
+        },
         "focusPanelIfTestsFail": {
           "title": "Focus The go-plus Panel If Tests Fail",
           "description": "If the panel is hidden, or the panel is showing a different tab, the panel will be expanded and the test tab focused when tests fail.",
           "type": "boolean",
           "default": true,
-          "order": 4
+          "order": 5
         }
       }
     }

styles/go-plus-test.atom-text-editor.less

@@ -9,3 +9,11 @@
   background-color: @background-color-success;
   opacity: 0.2;
 }
+
+.line-number.uncovered{
+  background-color: @background-color-error;
+}
+
+.line-number.covered{
+  background-color: @background-color-success;
+}