introduce a new pytest_report_header(hook) hook to add additional test-run relevant information to the header of a test report.

--HG--
branch : trunk

testing/plugin/test_pytest_terminal.py

@@ -289,6 +289,22 @@ class TestTerminal:
             ])
         result.stdout.fnmatch_lines(['*KEYBOARD INTERRUPT*'])
 
+    def test_pytest_report_header(self, testdir):
+        testdir.makeconftest("""
+            def pytest_report_header(config):
+                return "hello: info" 
+        """)
+        testdir.mkdir("a").join("conftest.py").write("""if 1:
+            def pytest_report_header(config):
+                return ["line1", "line2"]
+        """)
+        result = testdir.runpytest("a")
+        result.stdout.fnmatch_lines([
+            "*hello: info*",
+            "line1",
+            "line2",
+        ])
+
 
 class TestCollectonly:
     def test_collectonly_basic(self, testdir, linecomp):