diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8bdc5268..ec8e428d 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -464,7 +464,6 @@ add_jsonschema_test(test/pass_single_resolve_verbose)
 add_jsonschema_test(test/pass_single_resolve_fragment)
 add_jsonschema_test(test/pass_single_resolve_fragment_verbose)
 add_jsonschema_test(test/pass_single_comment_verbose)
-add_jsonschema_test(test/pass_single_no_description_verbose)
 add_jsonschema_test(test/pass_single_no_test_description_verbose)
 add_jsonschema_test(test/pass_single_data_path)
 add_jsonschema_test(test/pass_single_data_path_verbose)
@@ -669,7 +668,6 @@ add_jsonschema_test(compile/fail_invalid_header)
 add_jsonschema_test(compile/pass_bundled_metaschema)
 
 # Codegen
-add_jsonschema_test(codegen/pass_typescript)
 add_jsonschema_test(codegen/pass_typescript_name)
 add_jsonschema_test(codegen/pass_typescript_name_short)
 add_jsonschema_test(codegen/pass_typescript_explicit)
@@ -1119,9 +1117,9 @@ add_jsonschema_test(decode/fail_no_output)
 
 # CI specific tests
 add_jsonschema_test_ci(pass_bundle_http)
-add_jsonschema_test_ci(fail_bundle_http_non_200)
+add_jsonschema_test_ci(fail_bundle_http_non_json)
 add_jsonschema_test_ci(fail_bundle_http_non_schema)
-add_jsonschema_test_ci(fail_validate_http_non_200)
+add_jsonschema_test_ci(fail_validate_http_non_json)
 add_jsonschema_test_ci(fail_validate_http_non_schema)
 add_jsonschema_test_ci(pass_validate_http)
 add_jsonschema_test_ci(pass_install_http)
diff --git a/test/bundle/pass_ref_in_bundled_resolves_against_id.clitest b/test/bundle/pass_ref_in_bundled_resolves_against_id.clitest
index 5009fd87..4f44b5c0 100644
--- a/test/bundle/pass_ref_in_bundled_resolves_against_id.clitest
+++ b/test/bundle/pass_ref_in_bundled_resolves_against_id.clitest
@@ -22,6 +22,9 @@ EOF
 
 RUN bundle entry.json STDIN /dev/null IN . INTO result.txt EXPECTING 0
 
+// Taken before the placeholders go in, so the bundle keeps its real identifiers
+EXTRACT STDOUT FROM result.txt INTO bundled.json
+
 REPLACE $CWD_URI WITH '[CWD_URI]' IN result.txt
 REPLACE $CWD WITH '[CWD]' IN result.txt
 
@@ -47,3 +50,11 @@ WRITE expected.txt UNTIL EOF
 EOF
 
 COMPARE result.txt AGAINST expected.txt
+
+// Prove the emitted bundle is well formed JSON, as the sibling bundle tests do
+WRITE silent.txt UNTIL EOF
+EOF
+
+RUN fmt bundled.json --check STDIN /dev/null IN . INTO checked.txt EXPECTING 0
+
+COMPARE checked.txt AGAINST silent.txt
diff --git a/test/ci/fail_bundle_http_non_200.clitest b/test/ci/fail_bundle_http_non_json.clitest
similarity index 72%
rename from test/ci/fail_bundle_http_non_200.clitest
rename to test/ci/fail_bundle_http_non_json.clitest
index e5b1b45c..0fd1a0ae 100644
--- a/test/ci/fail_bundle_http_non_200.clitest
+++ b/test/ci/fail_bundle_http_non_json.clitest
@@ -1,3 +1,6 @@
+// The remote answers 200 with an HTML body, so this covers a
+// response that is not JSON at all, as distinct from the sibling
+// test where the body is JSON but not a schema
 WRITE schema.json UNTIL EOF
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
diff --git a/test/ci/fail_validate_http_non_200.clitest b/test/ci/fail_validate_http_non_json.clitest
similarity index 75%
rename from test/ci/fail_validate_http_non_200.clitest
rename to test/ci/fail_validate_http_non_json.clitest
index db5f4073..c99e5fb9 100644
--- a/test/ci/fail_validate_http_non_200.clitest
+++ b/test/ci/fail_validate_http_non_json.clitest
@@ -1,3 +1,6 @@
+// The remote answers 200 with an HTML body, so this covers a
+// response that is not JSON at all, as distinct from the sibling
+// test where the body is JSON but not a schema
 WRITE schema.json UNTIL EOF
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
diff --git a/test/codegen/pass_default_dialect_option_config.clitest b/test/codegen/pass_default_dialect_option_config.clitest
index a4ad6b2f..0a4b80fe 100644
--- a/test/codegen/pass_default_dialect_option_config.clitest
+++ b/test/codegen/pass_default_dialect_option_config.clitest
@@ -1,6 +1,11 @@
+// `const` arrived in Draft 6, so this schema generates a literal type under
+// 2020-12 and fails outright under Draft 4. That makes the output prove which
+// dialect won, where a plain `{"type": "string"}` would generate the same
+// either way and prove nothing
+
 WRITE schema.json UNTIL EOF
 {
-  "type": "string"
+  "const": "hello"
 }
 EOF
 
@@ -13,7 +18,7 @@ EOF
 RUN codegen schema.json --default-dialect https://json-schema.org/draft/2020-12/schema --target typescript STDIN /dev/null IN . INTO result.txt EXPECTING 0
 
 WRITE expected.txt UNTIL EOF
-1> export type Schema = string;
+1> export type Schema = "hello";
 EOF
 
 COMPARE result.txt AGAINST expected.txt
diff --git a/test/codegen/pass_typescript.clitest b/test/codegen/pass_typescript.clitest
deleted file mode 100644
index fe87eec2..00000000
--- a/test/codegen/pass_typescript.clitest
+++ /dev/null
@@ -1,27 +0,0 @@
-WRITE schema.json UNTIL EOF
-{
-  "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "type": "object",
-  "properties": {
-    "name": { "type": "string" },
-    "age": { "type": "integer" }
-  },
-  "required": [ "name" ]
-}
-EOF
-
-RUN codegen schema.json --target typescript STDIN /dev/null IN . INTO result.txt EXPECTING 0
-
-WRITE expected.txt UNTIL EOF
-1> export type SchemaName = string;
-1>
-1> export type SchemaAge = number;
-1>
-1> export interface Schema {
-1>   "name": SchemaName;
-1>   "age"?: SchemaAge;
-1>   [key: string]: unknown | undefined;
-1> }
-EOF
-
-COMPARE result.txt AGAINST expected.txt
diff --git a/test/compile/pass_patternproperties.clitest b/test/compile/pass_patternproperties.clitest
index 77346c7f..a5c06b6a 100644
--- a/test/compile/pass_patternproperties.clitest
+++ b/test/compile/pass_patternproperties.clitest
@@ -11,8 +11,15 @@ WRITE schema.json UNTIL EOF
 }
 EOF
 
+// The instances below carry a property whose name matches the pattern, so the
+// compiled subschema is actually reached. An empty object would satisfy any
+// schema and prove nothing about the compilation
 WRITE instance.json UNTIL EOF
-{}
+{ "foo-bar": "value" }
+EOF
+
+WRITE instance_invalid.json UNTIL EOF
+{ "foo-bar": 1 }
 EOF
 
 WRITE silent.txt UNTIL EOF
@@ -25,3 +32,51 @@ EXTRACT STDOUT FROM compiled.txt INTO template.json
 RUN validate --template template.json schema.json instance.json STDIN /dev/null IN . INTO validated.txt EXPECTING 0
 
 COMPARE validated.txt AGAINST silent.txt
+
+// Validation failure
+RUN validate --template template.json schema.json instance_invalid.json STDIN /dev/null IN . INTO validated_invalid.txt EXPECTING 2
+
+REPLACE $CWD WITH '[CWD]' IN validated_invalid.txt
+
+WRITE expected_invalid.txt UNTIL EOF
+2> fail: [CWD]/instance_invalid.json
+2> error: Schema validation failure
+2>   The value was expected to be of type string but it was of type integer
+2>     at instance location "/foo-bar" (line 1, column 3)
+2>     at evaluate path "/patternProperties/[\-]/type"
+2>   The object properties that match the regular expression "[\-]" were expected to validate against the defined pattern property subschema
+2>     at instance location "" (line 1, column 1)
+2>     at evaluate path "/patternProperties"
+EOF
+
+COMPARE validated_invalid.txt AGAINST expected_invalid.txt
+
+// Validation failure
+RUN validate --template template.json schema.json instance_invalid.json --json STDIN /dev/null IN . INTO validated_invalid_json.txt EXPECTING 2
+
+REPLACE $CWD_URI WITH '[CWD_URI]' IN validated_invalid_json.txt
+REPLACE $CWD WITH '[CWD]' IN validated_invalid_json.txt
+
+WRITE expected_invalid_json.txt UNTIL EOF
+1> {
+1>   "valid": false,
+1>   "errors": [
+1>     {
+1>       "keywordLocation": "/patternProperties/[\\-]/type",
+1>       "absoluteKeywordLocation": "[CWD_URI]/schema.json#/patternProperties/%5B%5C-%5D/type",
+1>       "instanceLocation": "/foo-bar",
+1>       "instancePosition": [ 1, 3, 1, 14 ],
+1>       "error": "The value was expected to be of type string but it was of type integer"
+1>     },
+1>     {
+1>       "keywordLocation": "/patternProperties",
+1>       "absoluteKeywordLocation": "[CWD_URI]/schema.json#/patternProperties",
+1>       "instanceLocation": "",
+1>       "instancePosition": [ 1, 1, 1, 16 ],
+1>       "error": "The object properties that match the regular expression \"[\\-]\" were expected to validate against the defined pattern property subschema"
+1>     }
+1>   ]
+1> }
+EOF
+
+COMPARE validated_invalid_json.txt AGAINST expected_invalid_json.txt
diff --git a/test/lint/fail_draft4_x_keyword_ref_target_fix.clitest b/test/lint/fail_draft4_x_keyword_ref_target_fix.clitest
index 5f0f89f5..c59e3afb 100644
--- a/test/lint/fail_draft4_x_keyword_ref_target_fix.clitest
+++ b/test/lint/fail_draft4_x_keyword_ref_target_fix.clitest
@@ -24,6 +24,8 @@ WRITE schema.json UNTIL EOF
 EOF
 
 // Schema input error
+COPY schema.json TO original.json
+
 RUN lint schema.json --fix STDIN /dev/null IN . INTO result_0.txt EXPECTING 4
 
 REPLACE $CWD_URI WITH '[CWD_URI]' IN result_0.txt
@@ -56,3 +58,6 @@ WRITE expected_1.txt UNTIL EOF
 EOF
 
 COMPARE result_1.txt AGAINST expected_1.txt
+
+// A failed fix must leave the schema exactly as it was
+COMPARE schema.json AGAINST original.json
diff --git a/test/lint/fail_lint_config_rule_top_level_violation.clitest b/test/lint/fail_lint_config_rule_top_level_violation.clitest
index aea490db..9c425dec 100644
--- a/test/lint/fail_lint_config_rule_top_level_violation.clitest
+++ b/test/lint/fail_lint_config_rule_top_level_violation.clitest
@@ -17,9 +17,17 @@ WRITE jsonschema.json UNTIL EOF
 }
 EOF
 
+// The subschema below is what makes `topLevel` observable: with the setting
+// only the root is reported, and without it this subschema would be reported
+// too. A schema with a root node alone would look identical either way
 WRITE schema.json UNTIL EOF
 {
-  "$schema": "https://json-schema.org/draft/2020-12/schema"
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$defs": {
+    "inner": {
+      "type": "string"
+    }
+  }
 }
 EOF
 
@@ -43,7 +51,7 @@ REPLACE $CWD WITH '[CWD]' IN result_1.txt
 WRITE expected_1.txt UNTIL EOF
 1> {
 1>   "valid": false,
-1>   "health": 0,
+1>   "health": 50,
 1>   "errors": [
 1>     {
 1>       "path": "[CWD]/schema.json",
@@ -51,7 +59,7 @@ WRITE expected_1.txt UNTIL EOF
 1>       "message": "The root schema must declare an $id",
 1>       "description": "The object value was expected to define the property \"$id\"",
 1>       "schemaLocation": [],
-1>       "position": [ 1, 1, 3, 1 ]
+1>       "position": [ 1, 1, 8, 1 ]
 1>     }
 1>   ]
 1> }
diff --git a/test/lint/fail_lint_directory_unresolvable_fix.clitest b/test/lint/fail_lint_directory_unresolvable_fix.clitest
index e52f9182..ac0dd132 100644
--- a/test/lint/fail_lint_directory_unresolvable_fix.clitest
+++ b/test/lint/fail_lint_directory_unresolvable_fix.clitest
@@ -1,4 +1,8 @@
-WRITE foo.json UNTIL EOF
+// The schemas live in a subdirectory so that the untouched copies taken below
+// are not themselves picked up by the recursive lint
+MAKE DIRECTORY schemas
+
+WRITE schemas/foo.json UNTIL EOF
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Test",
@@ -6,7 +10,7 @@ WRITE foo.json UNTIL EOF
 }
 EOF
 
-WRITE bar.json UNTIL EOF
+WRITE schemas/bar.json UNTIL EOF
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Test",
@@ -14,7 +18,7 @@ WRITE bar.json UNTIL EOF
 }
 EOF
 
-WRITE baz.json UNTIL EOF
+WRITE schemas/baz.json UNTIL EOF
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Test",
@@ -24,18 +28,27 @@ WRITE baz.json UNTIL EOF
 }
 EOF
 
+COPY schemas/foo.json TO original_foo.json
+COPY schemas/bar.json TO original_bar.json
+COPY schemas/baz.json TO original_baz.json
+
 // Validation failure
-RUN lint $CWD --fix --verbose STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
+RUN lint $CWD/schemas --fix --verbose STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
 
 REPLACE $CWD WITH '[CWD]' IN result_0.txt
 
 WRITE expected_0.txt UNTIL EOF
-1> baz.json:5:16:
+1> schemas/baz.json:5:16:
 1>   External references must point to schemas that can be resolved (invalid_external_ref)
 1>     at location "/allOf/0/$ref"
-2> Linting: [CWD]/bar.json
-2> Linting: [CWD]/baz.json
-2> Linting: [CWD]/foo.json
+2> Linting: [CWD]/schemas/bar.json
+2> Linting: [CWD]/schemas/baz.json
+2> Linting: [CWD]/schemas/foo.json
 EOF
 
 COMPARE result_0.txt AGAINST expected_0.txt
+
+// A failed fix must leave every schema in the directory as it was
+COMPARE schemas/foo.json AGAINST original_foo.json
+COMPARE schemas/bar.json AGAINST original_bar.json
+COMPARE schemas/baz.json AGAINST original_baz.json
diff --git a/test/lint/fail_lint_rule_violation.clitest b/test/lint/fail_lint_rule_violation.clitest
index e64f715e..4f34bf95 100644
--- a/test/lint/fail_lint_rule_violation.clitest
+++ b/test/lint/fail_lint_rule_violation.clitest
@@ -14,10 +14,19 @@ WRITE schema.json UNTIL EOF
 EOF
 
 // Validation failure
-RUN lint --rule rule.json --only require_type schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
+RUN lint --rule rule.json schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
 
 WRITE expected_0.txt UNTIL EOF
 1> schema.json:1:1:
+1>   Set a concise non-empty title at the top level of the schema to explain what the definition is about (top_level_title)
+1>     at location ""
+1> schema.json:1:1:
+1>   Set a non-empty description at the top level of the schema to explain what the definition is about in detail (top_level_description)
+1>     at location ""
+1> schema.json:1:1:
+1>   Set a non-empty examples array at the top level of the schema to illustrate the expected data (top_level_examples)
+1>     at location ""
+1> schema.json:1:1:
 1>   Every subschema must declare the type keyword (require_type)
 1>     at location ""
 1>     The object value was expected to define the property "type"
diff --git a/test/lint/fail_lint_rule_violation_json.clitest b/test/lint/fail_lint_rule_violation_json.clitest
index 9ec6259a..264c1d16 100644
--- a/test/lint/fail_lint_rule_violation_json.clitest
+++ b/test/lint/fail_lint_rule_violation_json.clitest
@@ -14,7 +14,7 @@ WRITE schema.json UNTIL EOF
 EOF
 
 // Validation failure
-RUN lint --rule rule.json --only require_type --json schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
+RUN lint --rule rule.json --json schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 2
 
 REPLACE $CWD WITH '[CWD]' IN result_0.txt
 
@@ -25,6 +25,30 @@ WRITE expected_0.txt UNTIL EOF
 1>   "errors": [
 1>     {
 1>       "path": "[CWD]/schema.json",
+1>       "id": "top_level_title",
+1>       "message": "Set a concise non-empty title at the top level of the schema to explain what the definition is about",
+1>       "description": null,
+1>       "schemaLocation": [],
+1>       "position": [ 1, 1, 3, 1 ]
+1>     },
+1>     {
+1>       "path": "[CWD]/schema.json",
+1>       "id": "top_level_description",
+1>       "message": "Set a non-empty description at the top level of the schema to explain what the definition is about in detail",
+1>       "description": null,
+1>       "schemaLocation": [],
+1>       "position": [ 1, 1, 3, 1 ]
+1>     },
+1>     {
+1>       "path": "[CWD]/schema.json",
+1>       "id": "top_level_examples",
+1>       "message": "Set a non-empty examples array at the top level of the schema to illustrate the expected data",
+1>       "description": null,
+1>       "schemaLocation": [],
+1>       "position": [ 1, 1, 3, 1 ]
+1>     },
+1>     {
+1>       "path": "[CWD]/schema.json",
 1>       "id": "require_type",
 1>       "message": "Every subschema must declare the type keyword",
 1>       "description": "The object value was expected to define the property \"type\"",
diff --git a/test/lint/pass_lint_config_rule_no_violation.clitest b/test/lint/pass_lint_config_rule_no_violation.clitest
index 053ccba7..06dd00f5 100644
--- a/test/lint/pass_lint_config_rule_no_violation.clitest
+++ b/test/lint/pass_lint_config_rule_no_violation.clitest
@@ -17,14 +17,20 @@ WRITE jsonschema.json UNTIL EOF
 }
 EOF
 
+// The title, description and examples below satisfy the built-in top level
+// rules, so the schema stays clean under the full rule set and this test only
+// fails if a rule regresses on it
 WRITE schema.json UNTIL EOF
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "Test",
+  "description": "Test schema",
+  "examples": [ "foo" ],
   "type": "string"
 }
 EOF
 
-RUN lint --only require_type schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 0
+RUN lint schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 0
 
 WRITE expected_0.txt UNTIL EOF
 EOF
diff --git a/test/lint/pass_lint_rule_no_violation.clitest b/test/lint/pass_lint_rule_no_violation.clitest
index 3feacc9a..ee7a2049 100644
--- a/test/lint/pass_lint_rule_no_violation.clitest
+++ b/test/lint/pass_lint_rule_no_violation.clitest
@@ -7,14 +7,20 @@ WRITE rule.json UNTIL EOF
 }
 EOF
 
+// The title, description and examples below satisfy the built-in top level
+// rules, so the schema stays clean under the full rule set and this test only
+// fails if a rule regresses on it
 WRITE schema.json UNTIL EOF
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "Test",
+  "description": "Test schema",
+  "examples": [ "foo" ],
   "type": "string"
 }
 EOF
 
-RUN lint --rule rule.json --only require_type schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 0
+RUN lint --rule rule.json schema.json STDIN /dev/null IN . INTO result_0.txt EXPECTING 0
 
 WRITE expected_0.txt UNTIL EOF
 EOF
diff --git a/test/test/pass_single_no_description_verbose.clitest b/test/test/pass_single_no_description_verbose.clitest
deleted file mode 100644
index 5bf7f2b6..00000000
--- a/test/test/pass_single_no_description_verbose.clitest
+++ /dev/null
@@ -1,38 +0,0 @@
-WRITE schema.json UNTIL EOF
-{
-  "id": "https://example.com",
-  "$schema": "http://json-schema.org/draft-04/schema#",
-  "title": "Test",
-  "description": "Test schema",
-  "type": "string"
-}
-EOF
-
-WRITE test.json UNTIL EOF
-{
-  "target": "https://example.com",
-  "tests": [
-    {
-      "valid": true,
-      "data": "foo"
-    },
-    {
-      "valid": false,
-      "data": 1
-    }
-  ]
-}
-EOF
-
-RUN test test.json --resolve schema.json --verbose --jobs 1 STDIN /dev/null IN . INTO result_0.txt EXPECTING 0
-
-REPLACE $CWD WITH '[CWD]' IN result_0.txt
-
-WRITE expected_0.txt UNTIL EOF
-1> [CWD]/test.json:
-1>   1/2 PASS <no description>
-1>   2/2 PASS <no description>
-2> Using parallelism: 1
-EOF
-
-COMPARE result_0.txt AGAINST expected_0.txt