diff --git a/index.html b/index.html
index 1321942..92e36f4 100644
--- a/index.html
+++ b/index.html
@@ -107,7 +107,7 @@ <h2>C Declarations &amp; printf/scanf &#10132; Prose</h2>
             <span>Function with empty parameter list takes unspecified number of parameters</span>
         </div>
         <div id="d-constexpr-implicit-const" class="d-info" hidden>
-            <span>Constexpr adds an implicit const in this case</span>
+            <span>constexpr adds an implicit const in this case</span>
         </div>
 
         <div id="d-format-syntax-error" class="d-error" hidden>
diff --git a/js/prose-decl.js b/js/prose-decl.js
index 78cddcf..074a6fa 100644
--- a/js/prose-decl.js
+++ b/js/prose-decl.js
@@ -182,7 +182,6 @@ export class Explainer {
             }
         }
 
-        // TODO: add regression testing
         if (histo.has('constexpr')
             && !Explainer.isExplicitlyConst(declarator, histo.has('const'))) {
             this.showDiagnostic('constexpr-implicit-const');
@@ -223,8 +222,8 @@ export class Explainer {
     /**
      * Returns copy with all consecutive trailing elements that satisfy
      * a given predicate removed.
-     * @param {Array} arr
-     * @param {any} predicate
+     * @param {Array} arr the array
+     * @param {any} predicate the predicate
      * @returns {Array}
      */
     static withoutTrailing(arr, predicate) {
diff --git a/test/test.js b/test/test.js
index dbeebf0..b05f7f9 100644
--- a/test/test.js
+++ b/test/test.js
@@ -181,18 +181,69 @@ describe('Examples', function () {
 
     code = 'signed bool';
     describe(code, function () {
+        const codeCopy = code;
         it('throws because "signed" and "bool" conflict', function () {
-            assert.throws(() => codeToProse(code),
+            assert.throws(() => codeToProse(codeCopy),
                 {message: 'Conflicting specifiers signed and bool'});
         });
     });
 
     code = 'constexpr const int *x';
     describe(code, function () {
-        const {paragraphs, _} = codeToProse(code);
+        const {paragraphs} = codeToProse(code);
         it('has correct prose', function () {
             const expected = ['Declare x as constexpr pointer to const int'];
             assert.deepEqual(paragraphs, expected);
         });
     });
+
+    code = 'constexpr int x';
+    describe(code, function () {
+        const {paragraphs, diagnostics} = codeToProse(code);
+        it('has correct prose', function () {
+            const expected = ['Declare x as constexpr int'];
+            assert.deepEqual(paragraphs, expected);
+        });
+        it('has constexpr-implicit-const diagnostic', function() {
+            assert.deepEqual(diagnostics, ['constexpr-implicit-const']);
+        });
+    });
+
+    code = 'constexpr const int x';
+    describe(code, function () {
+        const {paragraphs, diagnostics} = codeToProse(code);
+        it('has correct prose', function () {
+            const expected = ['Declare x as constexpr const int'];
+            assert.deepEqual(paragraphs, expected);
+        });
+        it('has no diagnostics', function() {
+            assert.equal(diagnostics.length, 0);
+        });
+    });
+
+    code = 'constexpr const int * const x';
+    describe(code, function () {
+        const {paragraphs, diagnostics} = codeToProse(code);
+        it('has correct prose', function () {
+            const expected = ['Declare x as constexpr const ' +
+            'pointer to const int'];
+            assert.deepEqual(paragraphs, expected);
+        });
+        it('has no diagnostics', function() {
+            assert.equal(diagnostics.length, 0);
+        });
+    });
+
+    code = 'constexpr const int * x[][]';
+    describe(code, function () {
+        const {paragraphs, diagnostics} = codeToProse(code);
+        it('has correct prose', function () {
+            const expected = ['Declare x as constexpr array of arrays ' +
+            'of pointers to const int'];
+            assert.deepEqual(paragraphs, expected);
+        });
+        it('has constexpr-implicit-const diagnostic', function() {
+            assert.deepEqual(diagnostics, ['constexpr-implicit-const']);
+        });
+    });
 });