diff --git a/arm-ttk/testcases/deploymentTemplate/URIs-Should-Be-Properly-Constructed.test.ps1 b/arm-ttk/testcases/deploymentTemplate/URIs-Should-Be-Properly-Constructed.test.ps1
new file mode 100644
index 00000000..ee7ad880
--- /dev/null
+++ b/arm-ttk/testcases/deploymentTemplate/URIs-Should-Be-Properly-Constructed.test.ps1
@@ -0,0 +1,38 @@
+<#
+.Synopsis
+    Ensures that URIs are properly constructed
+.Description
+    Ensures that properties named URI or URL are properly constructed, and do not use and -FunctionNotAllowedInUri
+#>
+param(
+    # The template object
+    [Parameter(Mandatory = $true, Position = 0)]
+    [PSObject]
+    $TemplateObject,
+
+    # A list of functions not allowed in the uri.  By default, format and concat.
+    [string[]]
+    $FunctionNotAllowedInUri = @('format', 'concat')
+)
+
+# commenting out the test due to # 417
+$foundObjects = Find-JsonContent -InputObject $TemplateObject -Key 'ur[il]$' -Match 
+
+foreach ($found in $foundObjects) { # Walk over each found object
+    foreach ($prop in $found.psobject.properties) { # then walk thru each property
+        if ($prop.Name -notmatch 'ur[il]$') { continue } # skipping ones that are not uri/url
+        if (-not $prop.value | ?<ARM_Template_Expression>) { continue } # and ones that do not contain an expression.
+        
+
+
+        # If the value contained expressions, but not the function uri
+        $foundBadFunction = $prop.Value | ?<ARM_Template_Function> -FunctionName ($FunctionNotAllowedInUri -join '|')
+        $foundUriFunction = $prop.Value | ?<ARM_Template_Function> -FunctionName uri
+        if (
+            ($foundBadFunction -and -not $foundUriFunction) -or 
+            $foundBadFunction.Index -lt $foundUriFunction.Index
+        ) {
+            Write-Error "Function'$($foundBadFunction.Groups['FunctionName'].Value)' found within '$($prop.Name)" -TargetObject $found -ErrorId "URI.Improperly.Constructed"
+        }
+    }
+}
diff --git a/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Concat.json b/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Concat.json
new file mode 100644
index 00000000..314eb931
--- /dev/null
+++ b/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Concat.json
@@ -0,0 +1,9 @@
+{
+    "$schema":  "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+    "resources":  [
+        {            
+            "aUri":  "[concat('foo', 'bar')]"
+        }
+    ]
+}
+
diff --git a/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Format.json b/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Format.json
new file mode 100644
index 00000000..66b33288
--- /dev/null
+++ b/unit-tests/URIs-Should-Be-Properly-Constructed/Fail/URI-Using-Format.json
@@ -0,0 +1,9 @@
+{
+    "$schema":  "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+    "resources":  [
+        {            
+            "aUri":  "[format('foo {0}', 'bar')]"
+        }
+    ]
+}
+
diff --git a/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/Concat-in-URL.json b/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/Concat-in-URL.json
new file mode 100644
index 00000000..7dadd6d0
--- /dev/null
+++ b/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/Concat-in-URL.json
@@ -0,0 +1,9 @@
+{
+"$schema":  "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+    "outputs": {
+        "ServerUrl": {
+          "type": "string",
+          "value": "[uri(concat('http://', reference(variables('publicIPAddressName')).dnsSettings.fqdn), 'somepath')]"
+        }
+    }
+}
diff --git a/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/MarketplaceSample.path.txt b/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/MarketplaceSample.path.txt
new file mode 100644
index 00000000..3e51b74e
--- /dev/null
+++ b/unit-tests/URIs-Should-Be-Properly-Constructed/Pass/MarketplaceSample.path.txt
@@ -0,0 +1 @@
+..\..\Common\Pass\100-marketplace-sample
diff --git a/unit-tests/URIs-Should-Be-Properly-Constructed/URIs-Should-Be-Properly-Constructed.tests.ps1 b/unit-tests/URIs-Should-Be-Properly-Constructed/URIs-Should-Be-Properly-Constructed.tests.ps1
new file mode 100644
index 00000000..d9e0b2ec
--- /dev/null
+++ b/unit-tests/URIs-Should-Be-Properly-Constructed/URIs-Should-Be-Properly-Constructed.tests.ps1
@@ -0,0 +1,6 @@
+
+#requires -module arm-ttk
+. $PSScriptRoot\..\arm-ttk.test.functions.ps1
+Test-TTK $psScriptRoot
+return        
+