{
  "testCases": [
    {
      "description": "Modify scalar in a wrapper proto",
      "originalResource": {
        "wrapper": "a"
      },
      "modifiedResource": {
        "wrapper": "b"
      },
      "expectedMask": "wrapper"
    },
    {
      "description": "Create wrapper proto",
      "originalResource": {},
      "modifiedResource": {
        "wrapper": "a"
      },
      "expectedMask": "wrapper"
    },
    {
      "description": "Modify element in a repeated field",
      "originalResource": {
        "foos": [
          {
            "num": "1"
          },
          {
            "num": "2"
          }
        ]
      },
      "modifiedResource": {
        "foos": [
          {
            "num": "1"
          },
          {
            "num": "3"
          }
        ]
      },
      "expectedMask": "foos"
    },
    {
      "description": "Modify element in a nested repeated field",
      "originalResource": {
        "foos": [
          {
            "bars": [
              {
                "num": "1"
              }
            ]
          }
        ]
      },
      "modifiedResource": {
        "foos": [
          {
            "bars": [
              {
                "num": "2"
              }
            ]
          }
        ]
      },
      "expectedMask": "foos"
    },
    {
      "description": "Create submessages",
      "originalResource": {},
      "modifiedResource": {
        "foo": {
          "num": 1
        }
      },
      "expectedMask": "foo.num"
    },
    {
      "description": "Modify submessage",
      "originalResource": {
        "foo": {}
      },
      "modifiedResource": {
        "foo": {
          "num": "1"
        }
      },
      "expectedMask": "foo.num"
    },
    {
      "description": "Clear submessage",
      "originalResource": {
        "foo": {}
      },
      "modifiedResource": {
        "foo": null
      },
      "expectedMask": "foo"
    },
    {
      "description": "No change",
      "originalResource": {
        "wrapper": "a",
        "foos": [
          {
            "num": "1"
          }
        ]
      },
      "modifiedResource": {
        "wrapper": "a",
        "foos": [
          {
            "num": "1"
          }
        ]
      },
      "expectedMask": ""
    },
    {
      "description": "Empty initial object (ForObject)",
      "originalResource": {},
      "modifiedResource": {
        "wrapper": "a",
        "foo": {
          "bar": {
            "nested_wrapper": true
          }
        },
        "foos": [
          {
            "num": "1"
          }
        ]
      },
      "expectedMask": "wrapper,foo.bar.nested_wrapper,foos"
    },
    {
      "description": "Message fields are partially present in modified resource, not present on original resource",
      "originalResource": {},
      "modifiedResource": {
        "dynamicSetting": {
          "domainName": "google.com",
          "trackingSetting": {}
        },
        "selectiveOptimization": {
          "conversionAction": "ca"
        }
      },
      "expectedMask": "dynamic_setting.domain_name,dynamic_setting.tracking_setting,selective_optimization.conversion_action",
      "allSetFieldsMask": "dynamic_setting.domain_name,dynamic_setting.tracking_setting,selective_optimization.conversion_action"
    },
    {
      "description": "Default message values in modified resource, not present on original resource",
      "originalResource": {},
      "modifiedResource": {
        "dynamicSetting": {
          "domainName": "",
          "useSuppliedUrlsOnly": false,
          "trackingSetting": {
            "trackingUrl": ""
          }
        },
        "selectiveOptimization": {}
      },
      "expectedMask": "dynamic_setting.domain_name,dynamic_setting.use_supplied_urls_only,dynamic_setting.tracking_setting.tracking_url,selective_optimization",
      "allSetFieldsMask": "dynamic_setting.use_supplied_urls_only,dynamic_setting.domain_name,dynamic_setting.tracking_setting.tracking_url,selective_optimization"
    },
    {
      "description": "Message fields are empty in modified object and set in original object",
      "originalResource": {
        "dynamicSetting": {
          "domainName": "google.com",
          "trackingSetting": {
            "trackingUrl": "tracking.com"
          }
        },
        "selectiveOptimization": {
          "conversionAction": "ca"
        }
      },
      "modifiedResource": {
        "dynamicSetting": {},
        "selectiveOptimization": {}
      },
      "expectedMask": "dynamic_setting.domain_name,dynamic_setting.tracking_setting.tracking_url,selective_optimization.conversion_action",
      "allSetFieldsMask": "dynamic_setting,selective_optimization"
    },
    {
      "description": "List field set to empty in modified resource to clear original resource list",
      "originalResource": {
        "optimizationSetting": {
          "optimizationTypes": [
            "UNKNOWN",
            "CALL_CLICKS"
          ]
        }
      },
      "modifiedResource": {
        "optimizationSetting": {
          "optimizationTypes": []
        }
      },
      "expectedMask": "optimization_setting.optimization_types",
      "allSetFieldsMask": "optimization_setting.optimization_types"
    }
  ]
}