diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3052605..d68cc75 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,6 +27,13 @@ jobs:
       - run: npm ci
       - run: npm test
 
+      #Run SonarCloud scanS
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarcloud-github-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+
       #Increase version in main branch
       - name: "Automated Version Bump"
         if: github.ref == 'refs/heads/master'
diff --git a/README.md b/README.md
index 6510bad..38fbbcb 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
-[![Build Status](https://travis-ci.com/unsegnor/object-repository.svg?branch=master)](https://travis-ci.com/unsegnor/object-repository)
 # object-repository
 Object repository. Just to work with javascript objects implementing transparent persistence. No 'Save' method anymore :)
+
+[![Mutation testing badge](https://img.shields.io/endpoint?style=plastic&url=https%3A%2F%2Fbadge-api.stryker-mutator.io%2Fgithub.com%2Funsegnor%2Fpersistent-programming%2Fmaster)](https://dashboard.stryker-mutator.io/reports/github.com/unsegnor/persistent-programming/master)
diff --git a/package-lock.json b/package-lock.json
index ddd7ef6..d2bf4ec 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
       "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
-      "dev": true,
       "requires": {
         "@babel/highlight": "^7.16.7"
       }
@@ -16,14 +15,12 @@
     "@babel/compat-data": {
       "version": "7.16.4",
       "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.16.4.tgz",
-      "integrity": "sha512-1o/jo7D+kC9ZjHX5v+EHrdjl3PhxMrLSOTGsOdHJ+KL8HCaEK6ehrVL2RS6oHDZp+L7xLirLrPmQtEng769J/Q==",
-      "dev": true
+      "integrity": "sha512-1o/jo7D+kC9ZjHX5v+EHrdjl3PhxMrLSOTGsOdHJ+KL8HCaEK6ehrVL2RS6oHDZp+L7xLirLrPmQtEng769J/Q=="
     },
     "@babel/core": {
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.16.7.tgz",
       "integrity": "sha512-aeLaqcqThRNZYmbMqtulsetOQZ/5gbR/dWruUCJcpas4Qoyy+QeagfDsPdMrqwsPRDNxJvBlRiZxxX7THO7qtA==",
-      "dev": true,
       "requires": {
         "@babel/code-frame": "^7.16.7",
         "@babel/generator": "^7.16.7",
@@ -45,14 +42,12 @@
         "semver": {
           "version": "6.3.0",
           "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
-          "dev": true
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
         },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
         }
       }
     },
@@ -60,7 +55,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.16.7.tgz",
       "integrity": "sha512-/ST3Sg8MLGY5HVYmrjOgL60ENux/HfO/CsUh7y4MalThufhE/Ff/6EibFDHi4jiDCaWfJKoqbE6oTh21c5hrRg==",
-      "dev": true,
       "requires": {
         "@babel/types": "^7.16.7",
         "jsesc": "^2.5.1",
@@ -70,8 +64,7 @@
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
         }
       }
     },
@@ -88,7 +81,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.16.7.tgz",
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-      "dev": true,
       "requires": {
         "@babel/compat-data": "^7.16.4",
         "@babel/helper-validator-option": "^7.16.7",
@@ -99,8 +91,7 @@
         "semver": {
           "version": "6.3.0",
           "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
-          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
-          "dev": true
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
         }
       }
     },
@@ -123,7 +114,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-environment-visitor/-/helper-environment-visitor-7.16.7.tgz",
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-      "dev": true,
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         "@babel/types": "^7.16.7"
       }
@@ -132,7 +122,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.16.7.tgz",
       "integrity": "sha512-QfDfEnIUyyBSR3HtrtGECuZ6DAyCkYFp7GHl75vFtTnn6pjKeK0T1DB5lLkFvBea8MdaiUABx3osbgLyInoejA==",
-      "dev": true,
       "requires": {
         "@babel/helper-get-function-arity": "^7.16.7",
         "@babel/template": "^7.16.7",
@@ -143,7 +132,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.16.7.tgz",
       "integrity": "sha512-flc+RLSOBXzNzVhcLu6ujeHUrD6tANAOU5ojrRx/as+tbzf8+stUCj7+IfRRoAbEZqj/ahXEMsjhOhgeZsrnTw==",
-      "dev": true,
       "requires": {
         "@babel/types": "^7.16.7"
       }
@@ -152,7 +140,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.16.7.tgz",
       "integrity": "sha512-m04d/0Op34H5v7pbZw6pSKP7weA6lsMvfiIAMeIvkY/R4xQtBSMFEigu9QTZ2qB/9l22vsxtM8a+Q8CzD255fg==",
-      "dev": true,
       "requires": {
         "@babel/types": "^7.16.7"
       }
@@ -170,7 +157,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.16.7.tgz",
       "integrity": "sha512-LVtS6TqjJHFc+nYeITRo6VLXve70xmq7wPhWTqDJusJEgGmkAACWwMiTNrvfoQo6hEhFwAIixNkvB0jPXDL8Wg==",
-      "dev": true,
       "requires": {
         "@babel/types": "^7.16.7"
       }
@@ -179,7 +165,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.16.7.tgz",
       "integrity": "sha512-gaqtLDxJEFCeQbYp9aLAefjhkKdjKcdh6DB7jniIGU3Pz52WAmP268zK0VgPz9hUNkMSYeH976K2/Y6yPadpng==",
-      "dev": true,
       "requires": {
         "@babel/helper-environment-visitor": "^7.16.7",
         "@babel/helper-module-imports": "^7.16.7",
@@ -223,7 +208,6 @@
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-simple-access/-/helper-simple-access-7.16.7.tgz",
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-      "dev": true,
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       }
@@ -232,7 +216,6 @@
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-      "dev": true,
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       }
@@ -240,20 +223,17 @@
     "@babel/helper-validator-identifier": {
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
-      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw==",
-      "dev": true
+      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw=="
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     "@babel/helper-validator-option": {
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helper-validator-option/-/helper-validator-option-7.16.7.tgz",
-      "integrity": "sha512-TRtenOuRUVo9oIQGPC5G9DgK4743cdxvtOw0weQNpZXaS16SCBi5MNjZF8vba3ETURjZpTbVn7Vvcf2eAwFozQ==",
-      "dev": true
+      "integrity": "sha512-TRtenOuRUVo9oIQGPC5G9DgK4743cdxvtOw0weQNpZXaS16SCBi5MNjZF8vba3ETURjZpTbVn7Vvcf2eAwFozQ=="
     },
     "@babel/helpers": {
       "version": "7.16.7",
       "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.16.7.tgz",
       "integrity": "sha512-9ZDoqtfY7AuEOt3cxchfii6C7GDyyMBffktR5B2jvWv8u2+efwvpnVKXMWzNehqy68tKgAfSwfdw/lWpthS2bw==",
-      "dev": true,
       "requires": {
         "@babel/template": "^7.16.7",
         "@babel/traverse": "^7.16.7",
@@ -264,7 +244,6 @@
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       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.7.tgz",
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-      "dev": true,
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         "@babel/helper-validator-identifier": "^7.16.7",
         "chalk": "^2.0.0",
@@ -275,7 +254,6 @@
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           "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
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-          "dev": true,
           "requires": {
             "ansi-styles": "^3.2.1",
             "escape-string-regexp": "^1.0.5",
@@ -287,8 +265,7 @@
     "@babel/parser": {
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       "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.16.7.tgz",
-      "integrity": "sha512-sR4eaSrnM7BV7QPzGfEX5paG/6wrZM3I0HDzfIAK06ESvo9oy3xBuVBxE3MbQaKNhvg8g/ixjMWo2CGpzpHsDA==",
-      "dev": true
+      "integrity": "sha512-sR4eaSrnM7BV7QPzGfEX5paG/6wrZM3I0HDzfIAK06ESvo9oy3xBuVBxE3MbQaKNhvg8g/ixjMWo2CGpzpHsDA=="
     },
     "@babel/plugin-proposal-class-properties": {
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@@ -375,7 +352,6 @@
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@@ -386,7 +362,6 @@
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@@ -404,12 +379,85 @@
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-      "dev": true,
       "requires": {
         "@babel/helper-validator-identifier": "^7.16.7",
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@istanbuljs/load-nyc-config": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
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+      "requires": {
+        "camelcase": "^5.3.1",
+        "find-up": "^4.1.0",
+        "get-package-type": "^0.1.0",
+        "js-yaml": "^3.13.1",
+        "resolve-from": "^5.0.0"
+      },
+      "dependencies": {
+        "argparse": {
+          "version": "1.0.10",
+          "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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+          "requires": {
+            "sprintf-js": "~1.0.2"
+          }
+        },
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
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+        },
+        "find-up": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
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+          "requires": {
+            "locate-path": "^5.0.0",
+            "path-exists": "^4.0.0"
+          }
+        },
+        "js-yaml": {
+          "version": "3.14.1",
+          "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz",
+          "integrity": "sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==",
+          "requires": {
+            "argparse": "^1.0.7",
+            "esprima": "^4.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+          "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+          "requires": {
+            "p-locate": "^4.1.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+          "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+          "requires": {
+            "p-limit": "^2.2.0"
+          }
+        }
+      }
+    },
+    "@istanbuljs/schema": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
+      "integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA=="
+    },
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       "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
@@ -677,6 +725,15 @@
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       "dev": true
     },
+    "aggregate-error": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
+      "integrity": "sha512-4I7Td01quW/RpocfNayFdFVk1qSuoh0E7JrbRJ16nH01HhKFQ88INq9Sd+nd72zqRySlr9BmDA8xlEJ6vJMrYA==",
+      "requires": {
+        "clean-stack": "^2.0.0",
+        "indent-string": "^4.0.0"
+      }
+    },
     "ajv": {
       "version": "8.8.2",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.8.2.tgz",
@@ -724,14 +781,12 @@
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-      "dev": true
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ=="
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-      "dev": true,
       "requires": {
         "color-convert": "^1.9.0"
       }
@@ -752,6 +807,19 @@
         "picomatch": "^2.0.4"
       }
     },
+    "append-transform": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-2.0.0.tgz",
+      "integrity": "sha512-7yeyCEurROLQJFv5Xj4lEGTy0borxepjFv1g22oAdqFu//SrAlDl1O1Nxx15SH1RoliUml6p8dwJW9jvZughhg==",
+      "requires": {
+        "default-require-extensions": "^3.0.0"
+      }
+    },
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@@ -2733,11 +3276,15 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "dev": true,
       "requires": {
         "isexe": "^2.0.0"
       }
     },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho="
+    },
     "wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -2778,8 +3325,18 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    },
+    "write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
     },
     "xregexp": {
       "version": "4.4.1",
diff --git a/package.json b/package.json
index 797a0a7..92fe6b3 100644
--- a/package.json
+++ b/package.json
@@ -7,10 +7,10 @@
   "scripts": {
     "test": "npm run test-mocha",
     "test-mocha": "npm run test-doubles && npm run test-domain && npm run test-adapters && npm run test-integration && npm run test-mutation",
-    "test-domain": "mocha domain --recursive",
-    "test-doubles": "mocha test-doubles --recursive",
-    "test-adapters": "mocha adapters --recursive",
-    "test-integration": "mocha test-integration --recursive",
+    "test-domain": "nyc mocha domain --recursive",
+    "test-doubles": "nyc mocha test-doubles --recursive",
+    "test-adapters": "nyc mocha adapters --recursive",
+    "test-integration": "nyc mocha test-integration --recursive",
     "test-mutation": "npx stryker run",
     "patch": "npm version patch && git push --follow-tags"
   },
@@ -24,5 +24,8 @@
     "mocha": "9.2.0",
     "expect-to-throw": "^3.0.0",
     "sinon": "^13.0.0"
+  },
+  "dependencies": {
+    "nyc": "^15.1.0"
   }
 }
diff --git a/sonar-project.properties b/sonar-project.properties
new file mode 100644
index 0000000..c76e00b
--- /dev/null
+++ b/sonar-project.properties
@@ -0,0 +1,12 @@
+sonar.projectKey=unsegnor_persistent-programming
+sonar.organization=unsegnor
+
+# This is the name and version displayed in the SonarCloud UI.
+#sonar.projectName=persistent-programming
+#sonar.projectVersion=1.0
+
+# Path is relative to the sonar-project.properties file. Replace "\" by "/" on Windows.
+#sonar.sources=.
+
+# Encoding of the source code. Default is default system encoding
+#sonar.sourceEncoding=UTF-8
\ No newline at end of file