Add coverage

tools/telemetry/third_party/coverage/tests/plugin1.py

+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+"""A plugin for test_plugins.py to import."""
+
+import os.path
+
+import coverage
+
+
+class Plugin(coverage.CoveragePlugin):
+    """A plugin to import, so that it isn't in the test's current directory."""
+
+    def file_tracer(self, filename):
+        """Trace only files named xyz.py"""
+        if "xyz.py" in filename:
+            return FileTracer(filename)
+
+    def file_reporter(self, filename):
+        return FileReporter(filename)
+
+
+class FileTracer(coverage.FileTracer):
+    """A FileTracer emulating a simple static plugin."""
+
+    def __init__(self, filename):
+        """Claim that xyz.py was actually sourced from ABC.zz"""
+        self._filename = filename
+        self._source_filename = os.path.join(
+            "/src",
+            os.path.basename(filename.replace("xyz.py", "ABC.zz"))
+        )
+
+    def source_filename(self):
+        return self._source_filename
+
+    def line_number_range(self, frame):
+        """Map the line number X to X05,X06,X07."""
+        lineno = frame.f_lineno
+        return lineno*100+5, lineno*100+7
+
+
+class FileReporter(coverage.FileReporter):
+    """Dead-simple FileReporter."""
+    def lines(self):
+        return set([105, 106, 107, 205, 206, 207])
+
+
+def coverage_init(reg, options):        # pylint: disable=unused-argument
+    """Called by coverage to initialize the plugins here."""
+    reg.add_file_tracer(Plugin())