test: migrate util message tests from Python to JS

test/fixtures/util/util-inspect-error-cause.js

@@ -0,0 +1,33 @@
+'use strict';
+
+require('../../common');
+
+const { inspect } = require('util');
+
+class FoobarError extends Error {
+  status = 'Feeling good';
+}
+
+const cause1 = new TypeError('Inner error');
+const cause2 = new FoobarError('Individual message', { cause: cause1 });
+cause2.extraProperties = 'Yes!';
+const cause3 = new Error('Stack causes', { cause: cause2 });
+
+const cause4 = new Error('Number error cause', { cause: 42 });
+const cause5 = new Error('Object cause', {
+  cause: {
+    message: 'Unique',
+    name: 'Error',
+    stack: 'Error: Unique\n' +
+      '    at Module._compile (node:internal/modules/cjs/loader:827:30)',
+  },
+});
+const cause6 = new Error('undefined cause', {
+  cause: undefined,
+});
+
+console.log(cause4);
+console.log(cause5);
+console.log(cause6);
+console.log(cause3);
+console.log(inspect(cause3, { compact: false, breakLength: Infinity }));

test/fixtures/util/util-inspect-error-cause.snapshot

@@ -0,0 +1,69 @@
+Error: Number error cause
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at * {
+  [cause]: 42
+}
+Error: Object cause
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at * {
+  [cause]: {
+    message: 'Unique',
+    name: 'Error',
+    stack: 'Error: Unique\n' +
+      '      at Module._compile (node:internal*modules*cjs*loader:*:*)'
+  }
+}
+Error: undefined cause
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at * {
+  [cause]: undefined
+}
+Error: Stack causes
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at *
+    at * {
+  [cause]: FoobarError: Individual message
+      at *
+      at *
+      at *
+      at *
+      at *
+      at *
+      at *
+      at * {
+    status: 'Feeling good',
+    extraProperties: 'Yes!',
+    [cause]: TypeError: Inner error
+        at *
+        at *
+        at *
+        at *
+        at *
+        at *
+        at *
+        at *
+  }
+}

test/message/util_inspect_error.js → test/fixtures/util/util_inspect_error.js

@@ -1,6 +1,6 @@
 'use strict';
 
-require('../common');
+require('../../common');
 const util = require('util');
 
 const err = new Error('foo\nbar');

test/message/util_inspect_error.out → test/fixtures/util/util_inspect_error.snapshot

@@ -11,16 +11,16 @@
        at *
   nested:
    { err:
-      Error: foo
-      bar
-          at *util_inspect_error*
-          at *
-          at *
-          at *
-          at *
-          at *
-          at *
-          at *
+       Error: foo
+       bar
+           at *util_inspect_error*
+           at *
+           at *
+           at *
+           at *
+           at *
+           at *
+           at * } }
 {
   err: Error: foo
   bar
@@ -31,7 +31,7 @@
       at *
       at *
       at *
-      at *
+      at *,
   nested: {
     err: Error: foo
     bar
@@ -45,7 +45,7 @@
         at *
   }
 }
-{ Error: foo
+Error: foo
 bar
     at *util_inspect_error*
     at *
@@ -54,5 +54,6 @@ bar
     at *
     at *
     at *
-    at *
-  foo: 'bar' }
+    at * {
+  foo: 'bar'
+}