mtest: log test start in verbose mode

In non-parallel verbose mode the output of the test/benchmark
is not buffered, therefore the command line is only printed by
ConsoleLogger for failing tests and only after the test has run.

Verbose mode is designed mostly for CI systems, where output must
be human readable but is generally consumed from a browser with "Find"
commands rather than from a terminal.  With this usecase in mind, it
is better to provide as much detail as possible, so add more output
and just tell the user which tests have started.  Do so, using the
recently introduced TestResult.RUNNING state.

mesonbuild/mtest.py

@@ -240,6 +240,9 @@ class TestResult(enum.Enum):
         return self in {TestResult.FAIL, TestResult.TIMEOUT, TestResult.INTERRUPT,
                         TestResult.UNEXPECTEDPASS, TestResult.ERROR}
 
+    def is_finished(self) -> bool:
+        return self not in {TestResult.PENDING, TestResult.RUNNING}
+
     def was_killed(self) -> bool:
         return self in (TestResult.TIMEOUT, TestResult.INTERRUPT)
 
@@ -248,8 +251,10 @@ class TestResult(enum.Enum):
             decorator = mlog.red
         elif self in (TestResult.SKIP, TestResult.EXPECTEDFAIL):
             decorator = mlog.yellow
-        else:
+        elif self.is_finished():
             decorator = mlog.green
+        else:
+            decorator = mlog.blue
         return decorator(s)
 
     def get_text(self, colorize: bool) -> str:
@@ -579,6 +584,17 @@ class ConsoleLogger(TestLogger):
             self.progress_task = asyncio.ensure_future(report_progress())
 
     def start_test(self, harness: 'TestHarness', test: 'TestRun') -> None:
+        if harness.options.verbose and test.cmdline:
+            self.flush()
+            print(harness.format(test, mlog.colorize_console(),
+                                 max_left_width=self.max_left_width,
+                                 right=test.res.get_text(mlog.colorize_console())))
+            print(test.res.get_command_marker() + test.cmdline)
+            if harness.options.num_processes == 1:
+                print(self.output_start, flush=True)
+            else:
+                print(flush=True)
+
         self.started_tests += 1
         self.running_tests.add(test)
         self.running_tests.move_to_end(test, last=False)
@@ -592,12 +608,14 @@ class ConsoleLogger(TestLogger):
         else:
             return str(mlog.bold('Listing only the last 100 lines from a long log.\n')) + '\n'.join(lines[-100:])
 
-    def print_log(self, result: 'TestRun', log: str) -> None:
-        cmdline = result.cmdline
-        if not cmdline:
-            print(result.res.get_command_marker() + result.stdo)
-            return
-        print(result.res.get_command_marker() + cmdline)
+    def print_log(self, harness: 'TestHarness', result: 'TestRun', log: str) -> None:
+        if not harness.options.verbose:
+            cmdline = result.cmdline
+            if not cmdline:
+                print(result.res.get_command_marker() + result.stdo)
+                return
+            print(result.res.get_command_marker() + cmdline)
+
         if log:
             print(self.output_start)
             print_safe(log, end='')
@@ -612,12 +630,18 @@ class ConsoleLogger(TestLogger):
 
         if not harness.options.quiet or not result.res.is_ok():
             self.flush()
-            print(harness.format(result, mlog.colorize_console(), max_left_width=self.max_left_width),
-                  flush=True)
-            if harness.options.verbose and harness.options.num_processes > 1:
-                self.print_log(result, result.get_log(mlog.colorize_console()))
-            elif result.res.is_bad():
-                self.print_log(result, '')
+            if harness.options.verbose and harness.options.num_processes == 1 and result.cmdline:
+                print(self.output_end)
+                print(harness.format(result, mlog.colorize_console(), max_left_width=self.max_left_width))
+                print(flush=True)
+            else:
+                print(harness.format(result, mlog.colorize_console(), max_left_width=self.max_left_width),
+                      flush=True)
+                if harness.options.verbose:
+                    self.print_log(harness, result, result.get_log(mlog.colorize_console()))
+                elif result.res.is_bad():
+                    self.print_log(harness, result, '')
+
         self.request_update()
 
     async def finish(self, harness: 'TestHarness') -> None: