Add tests for the other kinds of schema

This tests to make sure that the `additionalProperties: false` and `--nullable-all` schemas validate different sets of values to to the ones that are validated by the default `schema.json`.

In particular, `schema-nullable-all.json` should (unless disallowed by certain fields such as `enum`) all a file with all variables defined as `null`.  `schema-disallow-additional.json` should disallow additional properties, including within nested objects.

README.md

@@ -74,7 +74,7 @@ running Terraform.
 - `--stdout`: Print schema to stdout and prevent all other logging unless an error occurs. Does not create a file.
   Overrides `--debug` and `--output`.
 
-- `--export-variables`: Export the variables in JSON format directly and do not create a JSON Schema. This provides similar functionality to applications such as terraform-docs, where the input variables can be output to a machine-readable format such as JSON. The `type` field is converted to a type constraint based on the type definition, and the `default` field is translated to its literal value. `condition` inside the `validation` block is left as a string, because it is difficult to represent arbitrary (ie unevaluated) hcl Expressions in JSON.
+- `--export-variables`: Export the variables in JSON format directly and do not create a JSON Schema. This provides similar functionality to applications such as terraform-docs, where the input variables can be output to a machine-readable format such as JSON. The `type` field is converted to a type constraint based on the type definition, and the `default` field is translated to its literal value. `condition` inside the `validation` block is left as a string, because it is difficult to represent arbitrary (ie unevaluated) HCL Expressions in JSON.
 
 - `--escape-json`: Escape special characters in the JSON (`<`,`>` and `&`) so that the schema can be used in a web context. By default, this behaviour is disabled so the JSON file can be read more easily, though it does not effect external programs such as `jq`.
 

pkg/jsonschema/json-schema_test.go

@@ -86,6 +86,7 @@ func getErrorLocationsFromValidationErr(t *testing.T, valErr *jsonschema.Validat
 	return keywordLocations
 }
 
+//nolint:funlen,maintidx
 func TestSampleInput(t *testing.T) {
 	t.Parallel()
 
@@ -95,6 +96,7 @@ func TestSampleInput(t *testing.T) {
 		filePath         string
 		keywordLocations []errorLocation
 	}{
+		// Minimum input
 		{
 			name:             "empty minimum input",
 			filePath:         "../../test/expected/empty/sample-input/test-input-min.json",
@@ -125,6 +127,7 @@ func TestSampleInput(t *testing.T) {
 			schemaPath:       "../../test/expected/custom-validation/schema.json",
 			keywordLocations: nil,
 		},
+		// Maximum input plus an unknown variable, additionalProperties is true
 		{
 			name:             "simple full input",
 			filePath:         "../../test/expected/simple/sample-input/test-input-all.json",
@@ -149,6 +152,41 @@ func TestSampleInput(t *testing.T) {
 			schemaPath:       "../../test/expected/custom-validation/schema.json",
 			keywordLocations: nil,
 		},
+		// Maximum input plus an unknown variable, additionalProperties is false
+		{
+			name:       "simple full input additionalProperties false",
+			filePath:   "../../test/expected/simple/sample-input/test-input-all.json",
+			schemaPath: "../../test/expected/simple/schema-disallow-additional.json",
+			keywordLocations: []errorLocation{
+				{name: "/additionalProperties"},
+			},
+		},
+		{
+			name:       "simple-types full input additionalProperties false",
+			filePath:   "../../test/expected/simple-types/sample-input/test-input-all.json",
+			schemaPath: "../../test/expected/simple-types/schema-disallow-additional.json",
+			keywordLocations: []errorLocation{
+				{name: "/additionalProperties"},
+			},
+		},
+		{
+			name:       "complex-types full input additionalProperties false",
+			filePath:   "../../test/expected/complex-types/sample-input/test-input-all.json",
+			schemaPath: "../../test/expected/complex-types/schema-disallow-additional.json",
+			keywordLocations: []errorLocation{
+				{name: "/additionalProperties"},
+			},
+		},
+		{
+			name:       "custom-validation full input additionalProperties false",
+			filePath:   "../../test/expected/custom-validation/sample-input/test-input-all.json",
+			schemaPath: "../../test/expected/custom-validation/schema-disallow-additional.json",
+			keywordLocations: []errorLocation{
+				{name: "/additionalProperties"},
+				{name: "/properties/an_object_maximum_minimum_items/additionalProperties"},
+			},
+		},
+		// bad input on all fields
 		{
 			name:       "simple bad input",
 			filePath:   "../../test/expected/simple/sample-input/test-input-bad.json",
@@ -271,9 +309,104 @@ func TestSampleInput(t *testing.T) {
 				},
 			},
 		},
+		// null input on all fields, nullableAll is false
+		{
+			name:       "simple null input nullableAll false",
+			filePath:   "../../test/expected/simple/sample-input/test-input-null.json",
+			schemaPath: "../../test/expected/simple/schema.json",
+			keywordLocations: []errorLocation{
+				{name: "/properties/age/type"},
+				{name: "/properties/name/type"},
+			},
+		},
+		{
+			name:       "simple-types null input nullableAll false",
+			filePath:   "../../test/expected/simple-types/sample-input/test-input-null.json",
+			schemaPath: "../../test/expected/simple-types/schema.json",
+			keywordLocations: []errorLocation{
+				{name: "/properties/a_bool/type"},
+				{name: "/properties/a_list/type"},
+				{name: "/properties/a_map_of_strings/type"},
+				{name: "/properties/a_number/type"},
+				{name: "/properties/a_set/type"},
+				{name: "/properties/a_string/type"},
+				{name: "/properties/a_tuple/type"},
+				{name: "/properties/a_variable_in_another_file/type"},
+				{name: "/properties/an_object/type"},
+			},
+		},
+		{
+			name:       "complex-types null input nullableAll false",
+			filePath:   "../../test/expected/complex-types/sample-input/test-input-null.json",
+			schemaPath: "../../test/expected/complex-types/schema.json",
+			keywordLocations: []errorLocation{
+				{name: "/properties/a_very_complicated_object/type"},
+				{name: "/properties/an_object_with_optional/type"},
+			},
+		},
+		{
+			name:       "custom-validation null input nullableAll false",
+			filePath:   "../../test/expected/custom-validation/sample-input/test-input-null.json",
+			schemaPath: "../../test/expected/custom-validation/schema.json",
+			keywordLocations: []errorLocation{
+				{name: "/properties/a_list_maximum_minimum_length/type"},
+				{name: "/properties/a_map_maximum_minimum_entries/type"},
+				{name: "/properties/a_number_enum_kind_1/type"},
+				{name: "/properties/a_number_enum_kind_2/type"},
+				{name: "/properties/a_number_exclusive_maximum_minimum/type"},
+				{name: "/properties/a_number_maximum_minimum/type"},
+				{name: "/properties/a_set_maximum_minimum_items/type"},
+				{name: "/properties/a_string_enum_escaped_characters_kind_1/type"},
+				{name: "/properties/a_string_enum_escaped_characters_kind_2/type"},
+				{name: "/properties/a_string_enum_kind_1/type"},
+				{name: "/properties/a_string_enum_kind_2/type"},
+				{name: "/properties/a_string_length_over_defined/type"},
+				{name: "/properties/a_string_maximum_minimum_length/type"},
+				{name: "/properties/a_string_pattern_1/type"},
+				{name: "/properties/a_string_pattern_2/type"},
+				{name: "/properties/a_string_set_length/type"},
+				{name: "/properties/an_object_maximum_minimum_items/type"},
+			},
+		},
+		// null input on all fields, nullableAll is true
+		{
+			name:             "simple null input nullableAll true",
+			filePath:         "../../test/expected/simple/sample-input/test-input-null.json",
+			schemaPath:       "../../test/expected/simple/schema-nullable-all.json",
+			keywordLocations: nil,
+		},
+		{
+			name:             "simple-types null input nullableAll true",
+			filePath:         "../../test/expected/simple-types/sample-input/test-input-null.json",
+			schemaPath:       "../../test/expected/simple-types/schema-nullable-all.json",
+			keywordLocations: nil,
+		},
+		{
+			name:             "complex-types null input nullableAll true",
+			filePath:         "../../test/expected/complex-types/sample-input/test-input-null.json",
+			schemaPath:       "../../test/expected/complex-types/schema-nullable-all.json",
+			keywordLocations: nil,
+		},
+		{
+			// of note: custom validation still applies to nullable fields, and sometimes 'null' doesn't satisfy the
+			// condition, meaning these fields effectively can't be null.
+			// This seems to primarily be the case for "enum" fields. Other fields tend to ignore this error, in JSON Schema.
+			name:       "custom-validation null input nullableAll true",
+			filePath:   "../../test/expected/custom-validation/sample-input/test-input-null.json",
+			schemaPath: "../../test/expected/custom-validation/schema-nullable-all.json",
+			keywordLocations: []errorLocation{
+				{name: "/properties/a_number_enum_kind_1/enum"},
+				{name: "/properties/a_number_enum_kind_2/enum"},
+				{name: "/properties/a_string_enum_kind_1/enum"},
+				{name: "/properties/a_string_enum_kind_2/enum"},
+			},
+		},
 	}
 	for i := range testCases {
 		tc := testCases[i]
+		if tc.name != "custom-validation null input nullableAll true" {
+			continue
+		}
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 			path, err := filepath.Abs(tc.schemaPath)

test/expected/complex-types/sample-input/test-input-all.json

@@ -53,5 +53,6 @@
         "b": 2,
         "c": false,
         "d": "Optional string"
-    }
+    },
+    "something_else": "string"
 }

test/expected/custom-validation/sample-input/test-input-all.json

@@ -22,5 +22,6 @@
     "an_object_maximum_minimum_items": {
         "name": "a",
         "other_name": "this is an additional property, terraform will ignore it"
-    }
+    },
+    "something_else": "string"
 }

test/expected/simple-types/sample-input/test-input-all.json

@@ -29,5 +29,6 @@
         "a": "d",
         "b": 2,
         "c": false
-    }
+    },
+    "something_else": "string"
 }

test/expected/simple/sample-input/test-input-all.json

@@ -1,5 +1,6 @@
 {
     "$schema": "../schema.json",
     "name": "Aisling",
-    "age": 24
+    "age": 24,
+    "something_else": "string"
 }