1 files changed, 62 insertions, 0 deletions
diff --git a/tests/dialects/test_tableau.py b/tests/dialects/test_tableau.py
new file mode 100644
index 0000000..0f612dd
--- /dev/null
+++ b/tests/dialects/test_tableau.py
@@ -0,0 +1,62 @@
+from tests.dialects.test_dialect import Validator
+
+
+class TestTableau(Validator):
+    dialect = "tableau"
+
+    def test_tableau(self):
+        self.validate_all(
+            "IF x = 'a' THEN y ELSE NULL END",
+            read={
+                "presto": "IF(x = 'a', y, NULL)",
+            },
+            write={
+                "presto": "IF(x = 'a', y, NULL)",
+                "hive": "IF(x = 'a', y, NULL)",
+                "tableau": "IF x = 'a' THEN y ELSE NULL END",
+            },
+        )
+        self.validate_all(
+            "IFNULL(a, 0)",
+            read={
+                "presto": "COALESCE(a, 0)",
+            },
+            write={
+                "presto": "COALESCE(a, 0)",
+                "hive": "COALESCE(a, 0)",
+                "tableau": "IFNULL(a, 0)",
+            },
+        )
+        self.validate_all(
+            "COUNTD(a)",
+            read={
+                "presto": "COUNT(DISTINCT a)",
+            },
+            write={
+                "presto": "COUNT(DISTINCT a)",
+                "hive": "COUNT(DISTINCT a)",
+                "tableau": "COUNTD(a)",
+            },
+        )
+        self.validate_all(
+            "COUNTD((a))",
+            read={
+                "presto": "COUNT(DISTINCT(a))",
+            },
+            write={
+                "presto": "COUNT(DISTINCT (a))",
+                "hive": "COUNT(DISTINCT (a))",
+                "tableau": "COUNTD((a))",
+            },
+        )
+        self.validate_all(
+            "COUNT(a)",
+            read={
+                "presto": "COUNT(a)",
+            },
+            write={
+                "presto": "COUNT(a)",
+                "hive": "COUNT(a)",
+                "tableau": "COUNT(a)",
+            },
+        )