feat(vanilla): add testing infrastructure and tests (NK-wjnczv)

1 files changed, 44 insertions, 0 deletions

diff --git a/vanilla/node_modules/@bcoe/v8-coverage/src/lib/compare.js b/vanilla/node_modules/@bcoe/v8-coverage/src/lib/compare.js
new file mode 100644
index 0000000..d887018
--- /dev/null
+++ b/vanilla/node_modules/@bcoe/v8-coverage/src/lib/compare.js
@@ -0,0 +1,44 @@
+/**
+ * Compares two script coverages.
+ *
+ * The result corresponds to the comparison of their `url` value (alphabetical sort).
+ */
+function compareScriptCovs(a, b) {
+  if (a.url === b.url) {
+    return 0;
+  } else if (a.url < b.url) {
+    return -1;
+  } else {
+    return 1;
+  }
+}
+
+/**
+ * Compares two function coverages.
+ *
+ * The result corresponds to the comparison of the root ranges.
+ */
+function compareFunctionCovs(a, b) {
+  return compareRangeCovs(a.ranges[0], b.ranges[0]);
+}
+
+/**
+ * Compares two range coverages.
+ *
+ * The ranges are first ordered by ascending `startOffset` and then by
+ * descending `endOffset`.
+ * This corresponds to a pre-order tree traversal.
+ */
+function compareRangeCovs(a, b) {
+  if (a.startOffset !== b.startOffset) {
+    return a.startOffset - b.startOffset;
+  } else {
+    return b.endOffset - a.endOffset;
+  }
+}
+
+module.exports = {
+  compareScriptCovs,
+  compareFunctionCovs,
+  compareRangeCovs,
+};