feat(instrumenter): add more expression mutator for Date (stryker-mutator#4917)

Author: boretti

packages/instrumenter/src/mutators/method-expression-mutator.ts

@@ -21,14 +21,28 @@ const replacements = new Map([
   ['trim', null],
   ['trimEnd', 'trimStart'],
   ['min', 'max'],
-  ['getDate', 'getMonth'],
-  ['setDate', 'setMonth'],
+  ['getDate', 'getTime'],
+  ['setDate', 'setTime'],
+  ['getFullYear', 'getMonth'],
+  ['setFullYear', 'setMonth'],
   ['getHours', 'getMinutes'],
   ['setHours', 'setMinutes'],
+  ['getSeconds', 'getMilliseconds'],
+  ['setSeconds', 'setMilliseconds'],
+  ['getUTCDate', 'getTime'],
+  ['setUTCDate', 'setTime'],
+  ['getUTCFullYear', 'getUTCMonth'],
+  ['setUTCFullYear', 'setUTCMonth'],
+  ['getUTCHours', 'getUTCMinutes'],
+  ['setUTCHours', 'setUTCMinutes'],
+  ['getUTCSeconds', 'getUTCMilliseconds'],
+  ['setUTCSeconds', 'setUTCMilliseconds'],
 ]);
 
+const noReverseRemplacements = ['getUTCDate', 'setUTCDate'];
+
 for (const [key, value] of Array.from(replacements)) {
-  if (value) {
+  if (value && !noReverseRemplacements.includes(key)) {
     replacements.set(value, key);
   }
 }

packages/instrumenter/test/unit/mutators/method-expression-mutator.spec.ts

@@ -116,25 +116,39 @@ describe(sut.name, () => {
       });
     }
 
-    for (const [key, value] of [
+    for (const [key, value, noReverse] of [
       ['endsWith', 'startsWith'],
       ['every', 'some'],
       ['toLocaleLowerCase', 'toLocaleUpperCase'],
       ['toLowerCase', 'toUpperCase'],
       ['trimEnd', 'trimStart'],
       ['min', 'max'],
-      ['getDate', 'getMonth'],
-      ['setDate', 'setMonth'],
+      ['getDate', 'getTime'],
+      ['setDate', 'setTime'],
+      ['getFullYear', 'getMonth'],
+      ['setFullYear', 'setMonth'],
       ['getHours', 'getMinutes'],
       ['setHours', 'setMinutes'],
+      ['getSeconds', 'getMilliseconds'],
+      ['setSeconds', 'setMilliseconds'],
+      ['getUTCDate', 'getTime', true],
+      ['setUTCDate', 'setTime', true],
+      ['getUTCFullYear', 'getUTCMonth'],
+      ['setUTCFullYear', 'setUTCMonth'],
+      ['getUTCHours', 'getUTCMinutes'],
+      ['setUTCHours', 'setUTCMinutes'],
+      ['getUTCSeconds', 'getUTCMilliseconds'],
+      ['setUTCSeconds', 'setUTCMilliseconds'],
     ]) {
       it(`should replace ${key} with ${value}`, () => {
         expectJSMutation(sut, `text.${key}();`, `text.${value}();`);
       });
 
-      it(`should replace ${value} with ${key}`, () => {
-        expectJSMutation(sut, `text.${value}();`, `text.${key}();`);
-      });
+      if (!noReverse) {
+        it(`should replace ${value} with ${key}`, () => {
+          expectJSMutation(sut, `text.${value}();`, `text.${key}();`);
+        });
+      }
     }
 
     for (const method of ['charAt', 'filter', 'reverse', 'slice', 'sort', 'substr', 'substring', 'trim']) {