add tests for unknown values

command/inspect_test.go

@@ -69,11 +69,13 @@ local.fruit: "banana"
       <no post-processor>
 
 `},
-		{[]string{"inspect", "-var=fruit=peach", filepath.Join(testFixture("hcl"), "inspect", "fruit_string.pkr.hcl")}, nil, `Packer Inspect: HCL2 mode
+		{[]string{"inspect", "-var=fruit=peach", "-var=unknown_string=also_peach", `-var=unknown_unknown="peach_too"`, filepath.Join(testFixture("hcl"), "inspect", "fruit_string.pkr.hcl")}, nil, `Packer Inspect: HCL2 mode
 
 > input-variables:
 
 var.fruit: "peach"
+var.unknown_string: "also_peach"
+var.unknown_unknown: "peach_too"
 
 > local-variables:
 
@@ -86,6 +88,8 @@ var.fruit: "peach"
 > input-variables:
 
 var.fruit: "peach"
+var.unknown_string: "<unknown>"
+var.unknown_unknown: "<unknown>"
 
 > local-variables:
 
@@ -121,6 +125,26 @@ Use it at will.
         manifest
         shell-local
 
+`},
+		{[]string{"inspect", filepath.Join(testFixture("inspect"), "unset_var.json")}, nil, `Packer Inspect: JSON mode
+Required variables:
+
+  something
+
+Optional variables and their defaults:
+
+
+Builders:
+
+  <No builders>
+
+Provisioners:
+
+  <No provisioners>
+
+Note: If your build names contain user variables or template
+functions such as 'timestamp', these are processed at build time,
+and therefore only show in their raw form here.
 `},
 	}
 

command/test-fixtures/hcl/inspect/fruit_string.pkr.hcl

@@ -3,3 +3,10 @@ variable "fruit" {
   type = string
   default = "banana"
 }
+
+variable "unknown_string" {
+  type = string
+}
+
+variable "unknown_unknown" {
+}

command/test-fixtures/inspect/unset_var.json

@@ -0,0 +1,5 @@
+{
+    "variables": {
+        "something": null
+    }
+}