Added Tests for YANG model

Author: Sviatoslav Boichuk

src/sonic-yang-models/doc/Configuration.md

@@ -85,6 +85,7 @@ Table of Contents
          * [SYSTEM_DEFAULTS table](#systemdefaults-table)
          * [RADIUS](#radius)
          * [Static DNS](#static-dns)
+         * [Banner messages](#banner-messages)
    * [For Developers](#for-developers)
       * [Generating Application Config by Jinja2 Template](#generating-application-config-by-jinja2-template)
       * [Incremental Configuration by Subscribing to ConfigDB](#incremental-configuration-by-subscribing-to-configdb)
@@ -2556,6 +2557,24 @@ The DNS_NAMESERVER table introduces static DNS nameservers configuration.
 }
 ```
 
+### Banner messages
+
+The BANNER_MESSAGE table introduces static banner messages configuration.
+
+```json
+{
+    "BANNER_MESSAGE": {
+        "MESSAGE": {
+            "state": "enabled",
+            "login": "Some login message",
+            "motd": "ome message of the day",
+            "logout": "Some logout message"
+        }
+    }
+}
+```
+
+
 ### FIPS
 
 The FIPS table introduces FIPS  configuration.

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -5,6 +5,14 @@
                     "vni" : "100"
                 }
         },
+	"BANNER_MESSAGE": {
+	    "MESSAGE": {
+	        "state": "enabled",
+	        "login": "Some login message",
+	        "motd": "Some message of the day",
+	        "logout": "Some logout message"
+            }
+        },
         "DHCP_SERVER": {
             "192.0.0.8": {},
             "192.0.0.8": {}

src/sonic-yang-models/tests/yang_model_tests/tests/sonic-banner.json

@@ -0,0 +1,14 @@
+{
+    "BANNER_MESSAGE_TEST_STATE": {
+        "desc": "Configure Banner feature state."
+    },
+    "BANNER_MESSAGE_TEST_LOGIN" : {
+        "desc": "Banner login messages configuration in BANNER_MESSAGE table."
+    },
+    "BANNER_MESSAGE_TEST_MOTD" : {
+        "desc": "Banner MOTD messages configuration in BANNER_MESSAGE table."
+    },
+    "BANNER_MESSAGE_TEST_LOGOUT" : {
+        "desc": "Banner logout messages configuration in BANNER_MESSAGE table."
+    }
+}

src/sonic-yang-models/tests/yang_model_tests/tests_config/sonic-banner.json

@@ -0,0 +1,50 @@
+{
+    "BANNER_MESSAGE_TEST_STATE": {
+        "sonic-banner:sonic-banner": {
+            "sonic-banner:BANNER_MESSAGE": {
+                "MESSAGE": {
+                    "state": "enabled",
+                    "login": "Some login message",
+                    "motd": "Some message of the day",
+                    "logout": "Some logout message"
+                }
+            }
+        }
+    },
+    "BANNER_MESSAGE_TEST_LOGIN": {
+        "sonic-banner:sonic-banner": {
+            "sonic-banner:BANNER_MESSAGE": {
+                "MESSAGE": {
+                    "state": "enabled",
+                    "login": "Some login message",
+                    "motd": "Some message of the day",
+                    "logout": "Some logout message"
+                }
+            }
+        }
+    },
+    "BANNER_MESSAGE_TEST_MOTD": {
+        "sonic-banner:sonic-banner": {
+            "sonic-banner:BANNER_MESSAGE": {
+                "MESSAGE": {
+                    "state": "enabled",
+                    "login": "Some login message",
+                    "motd": "Some message of the day",
+                    "logout": "Some logout message"
+                }
+            }
+        }
+    },
+    "BANNER_MESSAGE_TEST_LOGOUT": {
+        "sonic-banner:sonic-banner": {
+            "sonic-banner:BANNER_MESSAGE": {
+                "MESSAGE": {
+                    "state": "enabled",
+                    "login": "Some login message",
+                    "motd": "Some message of the day",
+                    "logout": "Some logout message"
+                }
+            }
+        }
+    }
+}