Adding Unit testing docs and reference page

website/dbt-versions.js

@@ -26,6 +26,10 @@ exports.versions = [
 ]
 
 exports.versionedPages = [
+  {
+    "page": "reference/resource-properties/unit-tests",
+    "firstVersion": "1.7",
+  },
   {
     "page": "reference/resource-configs/store_failures_as",
     "firstVersion": "1.7",

website/docs/reference/resource-properties/unit-tests.md

@@ -0,0 +1,51 @@
+---
+title: "About unit tests property"
+sidebar_label: "unit tests"
+resource_types: [models]
+datatype: test
+---
+
+<file name='dbt_project.yml'>
+
+```yml
+unit-tests:
+  - name: <test-name> # this is the unique name of the test
+    model: <model-name> 
+    config: 
+			meta: {dictionary}
+			tags: <string> | [<string>]
+		given:
+      - input: <ref_or_source_call> # optional for seeds
+				format: dict | csv
+        # if format csv, either define dictionary of rows or name of fixture
+        rows:
+          - {dictionary}
+        fixture: <fixture-name>
+			- input: ... # declare additional inputs
+    expect:
+		  format: dict | csv
+      # if format csv, either define dictionary of rows or name of fixture
+	    rows: 
+			  - {dictionary}
+      fixture: <fixture-name>
+    overrides: # optional: configuration for the dbt execution environment
+      macros:
+        is_incremental: true | false
+        dbt_utils.current_timestamp: str
+					# ... any other jinja function from https://docs.getdbt.com/reference/dbt-jinja-functions
+          # ... any other context property
+       vars: {dictionary}
+       env_vars: {dictionary}
+  - name: <test-name> ... # declare additional unit tests
+
+  ```
+
+</file>
+
+
+## Definition
+
+Unit tests validate your modeling logic on a small set of static inputs before you materialize your full model in production. Unit tests enable test-driven development, with benefits for developer efficiency and code reliability. 
+
+To run just your unit tests:
+`dbt test —-select test_type:unit`

website/sidebars.js

@@ -744,6 +744,7 @@ const sidebarSettings = {
             "reference/resource-properties/include-exclude",
             "reference/resource-properties/quote",
             "reference/resource-properties/tests",
+            "reference/resource-properties/unit-tests",
             "reference/resource-properties/versions",
           ],
         },