test: increase inspect coverage

1. Truncate output for Primitives with 1 character left
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/util/inspect.js.html#L1359

2. Truncate output for ArrayBuffers using plural or singular bytes
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/util/inspect.js.html#L1465

test/parallel/test-util-inspect.js

@@ -210,6 +210,17 @@ assert(!/Object/.test(
                      'ArrayBuffer { (detached), byteLength: 0 }');
 }
 
+// Truncate output for ArrayBuffers using plural or singular bytes
+{
+  const ab = new ArrayBuffer(3);
+  assert.strictEqual(util.inspect(ab, { showHidden: true, maxArrayLength: 2 }),
+                     'ArrayBuffer { [Uint8Contents]' +
+                      ': <00 00 ... 1 more byte>, byteLength: 3 }');
+  assert.strictEqual(util.inspect(ab, { showHidden: true, maxArrayLength: 1 }),
+                     'ArrayBuffer { [Uint8Contents]' +
+                      ': <00 ... 2 more bytes>, byteLength: 3 }');
+}
+
 // Now do the same checks but from a different context.
 {
   const showHidden = false;
@@ -2915,6 +2926,12 @@ assert.strictEqual(
   assert.strictEqual(inspect(undetectable), '{}');
 }
 
+// Truncate output for Primitives with 1 character left
+{
+  assert.strictEqual(util.inspect('bl', { maxStringLength: 1 }),
+                     "'b'... 1 more character");
+}
+
 {
   const x = 'a'.repeat(1e6);
   assert(util.inspect(x).endsWith('... 990000 more characters'));