added test for find_owner_histories

hived/pyresttest_api_tests/database_api/database_api_test.yaml

@@ -134,3 +134,10 @@
     - method: "list_owner_histories"
     - args: '{ "start": ["null", "1970-01-01T00:00:00"], "limit": 1 }'
   - <<: *base_test
+
+- test:
+  - name: "find_owner_histories"
+  - variable_binds:
+    - method: "find_owner_histories"
+    - args: '{ "owner": "null" }'
+  - <<: *base_test

hived/pyresttest_api_tests/database_api/find_owner_histories.json.schema

+{
+  "$schema": "http://json-schema.org/schema#",
+  "additionalProperties": false,
+  "type": "object",
+  "properties": {
+    "jsonrpc": {
+      "type": "string"
+    },
+    "result": {
+      "type": "object",
+      "properties": {
+        "owner_auths": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "properties": {
+              "id": {
+                "type": "integer"
+              },
+              "account": {
+                "type": "string"
+              },
+              "previous_owner_authority": {
+                "type": "object",
+                "properties": {
+                  "weight_threshold": {
+                    "type": "integer"
+                  },
+                  "account_auths": {
+                    "type": "array"
+                  },
+                  "key_auths": {
+                    "type": "array",
+                    "items": {
+                      "type": "array",
+                      "items": {
+                        "type": [
+                          "integer",
+                          "string"
+                        ]
+                      }
+                    }
+                  }
+                },
+                "required": [
+                  "account_auths",
+                  "key_auths",
+                  "weight_threshold"
+                ]
+              },
+              "last_valid_time": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "account",
+              "id",
+              "last_valid_time",
+              "previous_owner_authority"
+            ]
+          }
+        }
+      },
+      "required": [
+        "owner_auths"
+      ]
+    },
+    "id": {
+      "type": "integer"
+    }
+  },
+  "required": [
+    "id",
+    "jsonrpc",
+    "result"
+  ]
+}