SONAR-4093 Display a tooltip that contains number of tests for the current line

plugins/sonar-core-plugin/src/main/resources/org/sonar/l10n/core.properties

@@ -1085,6 +1085,7 @@ violations_drilldown.no_violations=No violations
 #------------------------------------------------------------------------------
 
 resource_viewer.resource_deleted=This resource has been deleted.
+number_of_tests_covering_line=Number of tests covering this line : {0}
 
 
 #------------------------------------------------------------------------------

sonar-core/src/main/java/org/sonar/core/test/DefaultTestCase.java

@@ -101,7 +101,8 @@ public class DefaultTestCase extends BeanVertex implements MutableTestCase {
   }
 
   public void covers(Testable testable, List<Integer> lines) {
-    beanGraph().getUnderlyingGraph().addEdge(null, element(), ((BeanVertex) testable).element(), "covers").setProperty("lines", lines);
+    BeanVertex testableVertex = ((BeanVertex) testable);
+    beanGraph().getUnderlyingGraph().addEdge(null, element(), testableVertex.element(), "covers").setProperty("lines", lines);
   }
 
   public TestPlan testPlan() {

sonar-core/src/main/java/org/sonar/core/test/DefaultTestable.java

@@ -54,6 +54,16 @@ public class DefaultTestable extends BeanVertex implements MutableTestable {
     return testCases;
   }
 
+  public int countTestCasesOfLine(int line) {
+    int number = 0;
+    for (Edge edge : getCovers()) {
+      if (Iterables.contains(testedLines(edge), Long.valueOf(line))) {
+        number++;
+      }
+    }
+    return number;
+  }
+
   public Collection<TestCase> testCasesOfLine(int line) {
     ImmutableList.Builder<TestCase> cases = ImmutableList.builder();
     for (Edge edge : getCovers()) {

sonar-plugin-api/src/main/java/org/sonar/api/test/Testable.java

@@ -28,6 +28,8 @@ public interface Testable extends Perspective {
 
   Collection<TestCase> testCases();
 
+  int countTestCasesOfLine(int line);
+
   Collection<TestCase> testCasesOfLine(int line);
 
   SortedSet<Long> testedLines();

sonar-server/src/main/webapp/WEB-INF/app/controllers/resource_controller.rb

@@ -195,7 +195,8 @@ class ResourceController < ApplicationController
       @hits_by_line.each_pair do |line_id, hits|
         line = @lines[line_id-1]
         if line
-          line.covered_lines = testable.testCasesOfLine(line_id).size if testable && testable.testCasesOfLine(line_id).size > 0
+          line.covered_lines = 0
+          line.covered_lines = testable.countTestCasesOfLine(line_id) if testable
           line.hits = hits.to_i
           line.conditions = @conditions_by_line[line_id].to_i
           line.covered_conditions = @covered_conditions_by_line[line_id].to_i

sonar-server/src/main/webapp/WEB-INF/app/views/resource/index.html.erb

@@ -99,7 +99,7 @@
 
         <% if @display_coverage %>
           <% if line.highlighted? %>
-            <td class="ind <%= hits_status -%>"><%= line.covered_lines if line.covered_lines -%></td>
+            <td class="ind <%= hits_status -%>" title="<%= message("number_of_tests_covering_line", {:params => line.covered_lines.to_s}) if line.covered_lines > 0 -%>"><%= line.covered_lines if line.covered_lines > 0 -%></td>
             <td class="ind <%= conditions_status -%>">
               <% if line.deprecated_conditions_label -%>
                 <%= line.deprecated_conditions_label -%>