source map support for coverage

integration_tests/__tests__/__snapshots__/coverage-remapping-test.js.snap

@@ -0,0 +1,346 @@
+exports[`test maps code coverage against original source 1`] = `
+Object {
+  "covered.ts": Object {
+    "b": Object {
+      "0": Array [
+        1,
+        0,
+      ],
+      "1": Array [
+        1,
+        0,
+      ],
+      "2": Array [
+        1,
+        0,
+        0,
+      ],
+      "3": Array [
+        1,
+        0,
+      ],
+    },
+    "branchMap": Object {
+      "0": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 9,
+            "line": 5,
+          },
+          "start": Object {
+            "column": 8,
+            "line": 5,
+          },
+        },
+        "locations": Array [
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 5,
+            },
+            "start": Object {
+              "column": 8,
+              "line": 5,
+            },
+          },
+          Object {
+            "end": Object {
+              "column": 9,
+              "line": 6,
+            },
+            "start": Object {
+              "column": 8,
+              "line": 6,
+            },
+          },
+        ],
+        "type": "cond-expr",
+      },
+      "1": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 37,
+            "line": 7,
+          },
+          "start": Object {
+            "column": 36,
+            "line": 7,
+          },
+        },
+        "locations": Array [
+          Object {
+            "end": Object {
+              "column": 37,
+              "line": 7,
+            },
+            "start": Object {
+              "column": 36,
+              "line": 7,
+            },
+          },
+          Object {
+            "end": Object {
+              "column": 41,
+              "line": 7,
+            },
+            "start": Object {
+              "column": 40,
+              "line": 7,
+            },
+          },
+        ],
+        "type": "cond-expr",
+      },
+      "2": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 33,
+            "line": 8,
+          },
+          "start": Object {
+            "column": 29,
+            "line": 8,
+          },
+        },
+        "locations": Array [
+          Object {
+            "end": Object {
+              "column": 33,
+              "line": 8,
+            },
+            "start": Object {
+              "column": 29,
+              "line": 8,
+            },
+          },
+          Object {
+            "end": Object {
+              "column": 41,
+              "line": 8,
+            },
+            "start": Object {
+              "column": 37,
+              "line": 8,
+            },
+          },
+          Object {
+            "end": Object {
+              "column": 50,
+              "line": 8,
+            },
+            "start": Object {
+              "column": 45,
+              "line": 8,
+            },
+          },
+        ],
+        "type": "binary-expr",
+      },
+      "3": Object {
+        "loc": Object {
+          "end": Object {
+            "column": 42,
+            "line": 9,
+          },
+          "start": Object {
+            "column": 32,
+            "line": 9,
+          },
+        },
+        "locations": Array [
+          Object {
+            "end": Object {
+              "column": 42,
+              "line": 9,
+            },
+            "start": Object {
+              "column": 32,
+              "line": 9,
+            },
+          },
+          Object {
+            "end": Object {
+              "column": 55,
+              "line": 9,
+            },
+            "start": Object {
+              "column": 45,
+              "line": 9,
+            },
+          },
+        ],
+        "type": "cond-expr",
+      },
+    },
+    "f": Object {
+      "0": 1,
+      "1": 0,
+      "2": 0,
+    },
+    "fnMap": Object {
+      "0": Object {
+        "decl": Object {
+          "end": Object {
+            "column": 28,
+            "line": 3,
+          },
+          "start": Object {
+            "column": 9,
+            "line": 3,
+          },
+        },
+        "loc": Object {
+          "end": Object {
+            "column": 1,
+            "line": 12,
+          },
+          "start": Object {
+            "column": 49,
+            "line": 3,
+          },
+        },
+        "name": "difference",
+      },
+      "1": Object {
+        "decl": Object {
+          "end": Object {
+            "column": 37,
+            "line": 9,
+          },
+          "start": Object {
+            "column": 32,
+            "line": 9,
+          },
+        },
+        "loc": Object {
+          "end": Object {
+            "column": 42,
+            "line": 9,
+          },
+          "start": Object {
+            "column": 32,
+            "line": 9,
+          },
+        },
+        "name": "(anonymous_1)",
+      },
+      "2": Object {
+        "decl": Object {
+          "end": Object {
+            "column": 50,
+            "line": 9,
+          },
+          "start": Object {
+            "column": 45,
+            "line": 9,
+          },
+        },
+        "loc": Object {
+          "end": Object {
+            "column": 55,
+            "line": 9,
+          },
+          "start": Object {
+            "column": 45,
+            "line": 9,
+          },
+        },
+        "name": "(anonymous_2)",
+      },
+    },
+    "path": "covered.ts",
+    "s": Object {
+      "0": 1,
+      "1": 1,
+      "2": 1,
+      "3": 1,
+      "4": 1,
+      "5": 0,
+      "6": 0,
+      "7": 1,
+    },
+    "statementMap": Object {
+      "0": Object {
+        "end": Object {
+          "column": 1,
+          "line": 12,
+        },
+        "start": Object {
+          "column": 0,
+          "line": 3,
+        },
+      },
+      "1": Object {
+        "end": Object {
+          "column": 9,
+          "line": 6,
+        },
+        "start": Object {
+          "column": 29,
+          "line": 4,
+        },
+      },
+      "2": Object {
+        "end": Object {
+          "column": 41,
+          "line": 7,
+        },
+        "start": Object {
+          "column": 29,
+          "line": 7,
+        },
+      },
+      "3": Object {
+        "end": Object {
+          "column": 50,
+          "line": 8,
+        },
+        "start": Object {
+          "column": 29,
+          "line": 8,
+        },
+      },
+      "4": Object {
+        "end": Object {
+          "column": 55,
+          "line": 9,
+        },
+        "start": Object {
+          "column": 25,
+          "line": 9,
+        },
+      },
+      "5": Object {
+        "end": Object {
+          "column": 42,
+          "line": 9,
+        },
+        "start": Object {
+          "column": 38,
+          "line": 9,
+        },
+      },
+      "6": Object {
+        "end": Object {
+          "column": 55,
+          "line": 9,
+        },
+        "start": Object {
+          "column": 51,
+          "line": 9,
+        },
+      },
+      "7": Object {
+        "end": Object {
+          "column": 17,
+          "line": 11,
+        },
+        "start": Object {
+          "column": 4,
+          "line": 11,
+        },
+      },
+    },
+  },
+}
+`;

integration_tests/__tests__/coverage-remapping-test.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+'use strict';
+
+const {readFileSync} = require('fs');
+const {run} = require('../utils');
+const path = require('path');
+const runJest = require('../runJest');
+const skipOnWindows = require('skipOnWindows');
+
+skipOnWindows.suite();
+
+it('maps code coverage against original source', () => {
+  const dir = path.resolve(__dirname, '../coverage-remapping');
+  run('npm install', dir);
+  runJest(dir, ['--coverage', '--no-cache']);
+
+  const coverageMapFile = path.join(
+    __dirname,
+    '../coverage-remapping/coverage/coverage-final.json'
+  );
+  const coverageMap = JSON.parse(readFileSync(coverageMapFile, 'utf-8'));
+
+  // reduce absolute paths embedded in the coverage map to just filenames
+  Object.keys(coverageMap).forEach(filename => {
+    coverageMap[filename].path = path.basename(coverageMap[filename].path);
+    coverageMap[path.basename(filename)] = coverageMap[filename];
+    delete coverageMap[filename];
+  });
+  expect(coverageMap).toMatchSnapshot();
+});

integration_tests/coverage-remapping/__tests__/covered-test.ts

@@ -0,0 +1,6 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+const difference = require('../covered.ts');
+
+it('subtracts correctly', () => {
+  expect(difference(3, 2)).toBe(1);
+});