#21 booleanliteral

packages/instrumenter/src/mutators/boolean-literal-mutator.ts

@@ -6,15 +6,41 @@ const { types } = babel;
 
 import { NodeMutator } from './index.js';
 
+const booleanLiteralReplacements = Object.freeze({
+  // prettier-ignore
+  'true': {replacement: 'false', mutatorName: 'TrueToFalse'},
+  // prettier-ignore
+  'false': {replacement: 'true', mutatorName: 'FalseToTrue'},
+  '!': { replacement: '', mutatorName: 'RemoveNegation' },
+} as const);
+
 export const booleanLiteralMutator: NodeMutator = {
   name: 'BooleanLiteral',
 
-  *mutate(path) {
-    if (path.isBooleanLiteral()) {
-      yield types.booleanLiteral(!path.node.value);
-    }
-    if (path.isUnaryExpression() && path.node.operator === '!' && path.node.prefix) {
-      yield deepCloneNode(path.node.argument);
+  *mutate(path, options: string[] | undefined) {
+    if (isInMutationLevel(path, options)) {
+      if (path.isBooleanLiteral()) {
+        yield types.booleanLiteral(!path.node.value);
+      }
+      if (path.isUnaryExpression() && path.node.operator === '!' && path.node.prefix) {
+        yield deepCloneNode(path.node.argument);
+      }
     }
   },
 };
+
+function isInMutationLevel(path: any, mutators: string[] | undefined): boolean {
+  if (mutators === undefined) {
+    return true;
+  }
+  if (path.isBooleanLiteral()) {
+    const { mutatorName } = booleanLiteralReplacements[path.node.value as keyof typeof booleanLiteralReplacements];
+    return mutators.some((lit) => lit === mutatorName);
+  }
+  return (
+    path.isUnaryExpression() &&
+    path.node.operator === '!' &&
+    path.node.prefix &&
+    mutators.some((lit: string) => lit === booleanLiteralReplacements['!'].mutatorName)
+  );
+}

packages/instrumenter/test/unit/mutators/boolean-literal-mutator.spec.ts

@@ -1,7 +1,23 @@
 import { expect } from 'chai';
 
+import { MutationLevel } from '@stryker-mutator/api/core';
+
 import { booleanLiteralMutator as sut } from '../../../src/mutators/boolean-literal-mutator.js';
-import { expectJSMutation } from '../../helpers/expect-mutation.js';
+import { expectJSMutation, expectJSMutationWithLevel } from '../../helpers/expect-mutation.js';
+
+const booleanLiteralLevel: MutationLevel = {
+  name: 'BooleanLiteralLevel',
+  BooleanLiteral: ['TrueToFalse', 'RemoveNegation'],
+};
+
+const booleanLiteralAllLevel: MutationLevel = {
+  name: 'BooleanLiteralLevel',
+  BooleanLiteral: ['TrueToFalse', 'FalseToTrue', 'RemoveNegation'],
+};
+
+const booleanLiteralUndefinedLevel: MutationLevel = {
+  name: 'BooleanLiteralLevel',
+};
 
 describe(sut.name, () => {
   it('should have name "BooleanLiteral"', () => {
@@ -19,4 +35,40 @@ describe(sut.name, () => {
   it('should mutate !a to a', () => {
     expectJSMutation(sut, '!a', 'a');
   });
+
+  it('should only mutate what is defined in the mutation level', () => {
+    expectJSMutationWithLevel(
+      sut,
+      booleanLiteralLevel.BooleanLiteral,
+      'if (true) {}; if (false) {}; if (!value) {}',
+      'if (false) {}; if (false) {}; if (!value) {}',
+      'if (true) {}; if (false) {}; if (value) {}',
+    );
+  });
+
+  it('should not mutate anything if there are no values in the mutation level', () => {
+    expectJSMutationWithLevel(sut, [], 'if (true) {}; if (false) {}; if (!value) {}');
+  });
+
+  it('should mutate everything if everything is in the mutation level', () => {
+    expectJSMutationWithLevel(
+      sut,
+      booleanLiteralAllLevel.BooleanLiteral,
+      'if (true) {}; if (false) {}; if (!value) {}',
+      'if (false) {}; if (false) {}; if (!value) {}',
+      'if (true) {}; if (false) {}; if (value) {}',
+      'if (true) {}; if (true) {}; if (!value) {}',
+    );
+  });
+
+  it('should mutate everything if the mutation level is undefined', () => {
+    expectJSMutationWithLevel(
+      sut,
+      booleanLiteralUndefinedLevel.BooleanLiteral,
+      'if (true) {}; if (false) {}; if (!value) {}',
+      'if (false) {}; if (false) {}; if (!value) {}',
+      'if (true) {}; if (false) {}; if (value) {}',
+      'if (true) {}; if (true) {}; if (!value) {}',
+    );
+  });
 });

testing-project/stryker.conf.json

@@ -19,7 +19,8 @@
     { 
       "name": "default",
       "ArithmeticOperator": ["+To-", "-To+", "*To/"],
-      "ArrayDeclaration": ["EmptyArray", "FilledArray", "FilledArrayConstructor"]
+      "ArrayDeclaration": ["EmptyArray", "FilledArray", "FilledArrayConstructor"],
+      "BooleanLiteral": ["TrueToFalse", "RemoveNegation"]
 
     },
     {