diff --git a/sof-js/tests/1_basic.test.js b/sof-js/tests/1_basic.test.js
index 2745369..8cbc34c 100644
--- a/sof-js/tests/1_basic.test.js
+++ b/sof-js/tests/1_basic.test.js
@@ -1,6 +1,6 @@
 import { expect, test , describe, beforeAll, afterAll} from "bun:test";
 import { evaluate, get_columns, row_product } from '../src/index.js'
-import { start_case, end_case, add_test, debug, run_test, should_fail, add_throwing_test } from './test_helpers.js'
+import { start_case, end_case, add_test, debug, should_fail, add_throwing_test } from './test_helpers.js'
 
 test("row_product", () => {
   expect(row_product([[{a: 1}, {a: 2}], [{b: 1}, {b: 2}]]))
diff --git a/sof-js/tests/2_fhirpath.test.js b/sof-js/tests/2_fhirpath.test.js
index 0809639..1085461 100644
--- a/sof-js/tests/2_fhirpath.test.js
+++ b/sof-js/tests/2_fhirpath.test.js
@@ -1,6 +1,6 @@
 import { expect, test, describe } from "bun:test";
 import { evaluate, row_product } from '../src/index.js'
-import { start_case, end_case, add_test, run_test, should_fail } from './test_helpers.js'
+import { start_case, end_case, add_test, should_fail } from './test_helpers.js'
 
 let l = console.log
 
diff --git a/sof-js/tests/3_foreach.test.js b/sof-js/tests/3_foreach.test.js
index 229fb56..b42c687 100644
--- a/sof-js/tests/3_foreach.test.js
+++ b/sof-js/tests/3_foreach.test.js
@@ -1,5 +1,5 @@
 import { expect, test, describe } from "bun:test";
-import { start_case, end_case, run_test,add_test, debug } from './test_helpers.js'
+import { start_case, end_case, add_test, debug } from './test_helpers.js'
 
 let l = console.log
 
diff --git a/sof-js/tests/test_helpers.js b/sof-js/tests/test_helpers.js
index 3d639db..9a5b0c6 100644
--- a/sof-js/tests/test_helpers.js
+++ b/sof-js/tests/test_helpers.js
@@ -4,6 +4,7 @@ import fs from 'fs'
 
 
 let test_case = null;
+
 export function start_case(name, desc, resources) {
   test_case = {
     title: name,
@@ -13,19 +14,10 @@ export function start_case(name, desc, resources) {
   }
 }
 
-export function run_test(viewdef, result) {
-  // TODO: dump tests
-  let res = evaluate( viewdef, test_case.resources)
-  test_case.tests.push({view: viewdef, expect: result})
-  expect(res).toEqual(result);
-
-}
-
-
 export function add_test(opts) {
   test(opts.title, () => {
-    const res = evaluate(opts.view, test_case.resources);
     test_case.tests.push(opts);
+    const res = evaluate(opts.view, test_case.resources);
     expect(res).toEqual(opts.expect);
   })
 }
@@ -38,10 +30,9 @@ export function add_throwing_test(opts) {
 }
 
 export function invalid_view(opts) {
-  test(opts.title, ()=>{
+  test(opts.title, () => {
     test_case.tests.push(opts)
     let errs = errors(opts.view, test_case.resources)
-    // console.log(errs)
     expect((errs || []).length > 0).toEqual(true)
   })
 }
diff --git a/tests/fn_boundary.json b/tests/fn_boundary.json
index c2668a0..4495ecd 100644
--- a/tests/fn_boundary.json
+++ b/tests/fn_boundary.json
@@ -31,5 +31,146 @@
       "status": "final"
     }
   ],
-  "tests": []
+  "tests": [
+    {
+      "title": "decimal lowBoundary",
+      "view": {
+        "resource": "Observation",
+        "status": "active",
+        "select": [
+          {
+            "column": [
+              {
+                "name": "id",
+                "path": "id"
+              },
+              {
+                "name": "decimal",
+                "path": "value.ofType(Quantity).value.lowBoundary()"
+              }
+            ]
+          }
+        ]
+      },
+      "expect": [
+        {
+          "id": "o1",
+          "decimal": 0.95
+        },
+        {
+          "id": "o2",
+          "decimal": null
+        },
+        {
+          "id": "o3",
+          "decimal": null
+        }
+      ]
+    },
+    {
+      "title": "decimal highBoundary",
+      "view": {
+        "resource": "Observation",
+        "status": "active",
+        "select": [
+          {
+            "column": [
+              {
+                "name": "id",
+                "path": "id"
+              },
+              {
+                "name": "decimal",
+                "path": "value.ofType(Quantity).value.highBoundary()"
+              }
+            ]
+          }
+        ]
+      },
+      "expect": [
+        {
+          "id": "o1",
+          "decimal": 1.05
+        },
+        {
+          "id": "o2",
+          "decimal": null
+        },
+        {
+          "id": "o3",
+          "decimal": null
+        }
+      ]
+    },
+    {
+      "title": "datetime lowBoundary",
+      "view": {
+        "resource": "Observation",
+        "status": "active",
+        "select": [
+          {
+            "column": [
+              {
+                "name": "id",
+                "path": "id"
+              },
+              {
+                "name": "datetime",
+                "path": "value.ofType(DateTime).lowBoundary()"
+              }
+            ]
+          }
+        ]
+      },
+      "expect": [
+        {
+          "id": "o1",
+          "decimal": null
+        },
+        {
+          "id": "o2",
+          "decimal": "2010-10-10T00:00:00.000+14:00"
+        },
+        {
+          "id": "o3",
+          "decimal": null
+        }
+      ]
+    },
+    {
+      "title": "datetime highBoundary",
+      "view": {
+        "resource": "Observation",
+        "status": "active",
+        "select": [
+          {
+            "column": [
+              {
+                "name": "id",
+                "path": "id"
+              },
+              {
+                "name": "datetime",
+                "path": "value.ofType(DateTime).highBoundary()"
+              }
+            ]
+          }
+        ]
+      },
+      "expect": [
+        {
+          "id": "o1",
+          "decimal": null
+        },
+        {
+          "id": "o2",
+          "decimal": "2010-10-10T23:59:59.999-12:00"
+        },
+        {
+          "id": "o3",
+          "decimal": null
+        }
+      ]
+    }
+  ]
 }