mod function

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

tests/interpreter/cases/builtins/numbers.yaml

@@ -142,3 +142,117 @@ cases:
         x = numbers.range(1, "2")
     query: data.test.x
     error: "`numbers.range` expects numeric argument"
+
+  - note: round
+    data: {}
+    modules:
+      - |
+        package test
+        x = [round(-9.4), round(-9.5), round(-9.6),
+             round(9.4), round(9.5), round(9.6)]
+    query: data.test.x
+    want_result: [-9, -10, -10, 9, 10, 10]
+    
+  - note: round-extra-args
+    data: {}
+    modules:
+      - |
+        package test
+        x = round(-9, 10)
+    query: data.test.x
+    error: "`round` expects 1 argument"
+  
+  - note: round-invalid-type
+    data: {}
+    modules:
+      - |
+        package test
+        x = round("-9")
+    query: data.test.x
+    error: "`round` expects numeric argument"
+
+  - note: div
+    data: {}
+    modules:
+      - |
+        package test
+        x = 1/3
+    query: data.test.x
+    want_result:  0.3333333333333333
+    
+  - note: div-non-numeric
+    data: {}
+    modules:
+      - |
+        package test
+        x = "1" / 9
+    query: data.test.x
+    error: "`div` expects numeric argument."
+    
+  - note: div-undefined
+    data: {}
+    modules:
+      - |
+        package test
+        import future.keywords.if
+        a if false
+        x = a / 1
+    query: data.test
+    want_result: {}
+
+  - note: div-by-zero
+    data: {}
+    modules:
+      - |
+        package test
+        x = 1/0
+    query: data.test
+    want_result: {}
+    
+  - note: mod
+    data: {}
+    modules:
+      - |
+        package test
+        x = 10%3
+    query: data.test.x
+    want_result:  1
+    
+  - note: mod-non-numeric
+    data: {}
+    modules:
+      - |
+        package test
+        x = "1" % 9
+    query: data.test.x
+    error: "`mod` expects numeric argument."
+    
+  - note: mod-undefined
+    data: {}
+    modules:
+      - |
+        package test
+        import future.keywords.if
+        a if false
+        x = a % 10
+    query: data.test
+    want_result: {}
+
+  - note: mod-by-zero
+    data: {}
+    modules:
+      - |
+        package test
+        x = 1%0
+    query: data.test
+    want_result: {}
+    
+  - note: all
+    data: {}
+    modules:
+      - |
+        package test
+        x = 16 / 2 % 5 / 2
+    query: data.test
+    want_result:
+      x: 1.5