Cycles tests: Rework output messages

Made them closer to how GTest shows the output, so reading test logs
is easier now (at least feels more uniform).

Additionally now we know how much time tests are taking so can tweak
samples/resolution to reduce render time of slow tests.

It is now also possible to enable colored messages using magic
CYCLESTEST_COLOR environment variable. This makes it even easier to
visually grep failed/passed tests using `ctest -R cycles -V`.

tests/python/cycles_render_tests.py

@@ -6,9 +6,46 @@ import os
 import shutil
 import subprocess
 import sys
+import time
 import tempfile
 
 
+class COLORS_ANSI:
+    RED = '\033[00;31m'
+    GREEN = '\033[00;32m'
+    ENDC = '\033[0m'
+
+
+class COLORS_DUMMY:
+    RED = ''
+    GREEN = ''
+    ENDC = ''
+
+COLORS = COLORS_DUMMY
+
+
+def printMessage(type, status, message):
+    if type == 'SUCCESS':
+        print(COLORS.GREEN, end="")
+    elif type == 'FAILURE':
+        print(COLORS.RED, end="")
+    status_text = ...
+    if status == 'RUN':
+        status_text = " RUN      "
+    elif status == 'OK':
+        status_text = "       OK "
+    elif status == 'PASSED':
+        status_text = "  PASSED  "
+    elif status == 'FAILED':
+        status_text = "  FAILED  "
+    else:
+        status_text = status
+    print("[{}]" . format(status_text), end="")
+    print(COLORS.ENDC, end="")
+    print(" {}" . format(message))
+    sys.stdout.flush()
+
+
 def render_file(filepath):
     command = (
         BLENDER,
@@ -83,16 +120,32 @@ def verify_output(filepath):
 def run_test(filepath):
     testname = test_get_name(filepath)
     spacer = "." * (32 - len(testname))
-    print(testname, spacer, end="")
-    sys.stdout.flush()
+    printMessage('SUCCESS', 'RUN', testname)
+    time_start = time.time()
     error = render_file(filepath)
+    status = "FAIL"
     if not error:
-        if verify_output(filepath):
-            print("PASS")
-        else:
+        if not verify_output(filepath):
             error = "VERIFY"
-    if error:
-        print("FAIL", error)
+    time_end = time.time()
+    elapsed_ms = int((time_end - time_start) * 1000)
+    if not error:
+        printMessage('SUCCESS', 'OK', "{} ({} ms)" .
+                     format(testname, elapsed_ms))
+    else:
+        if error == "NO_CYCLES":
+            print("Can't perform tests because Cycles failed to load!")
+            return False
+        elif error == "NO_START":
+            print('Can not perform tests because blender fails to start.',
+                  'Make sure INSTALL target was run.')
+            return False
+        elif error == 'VERIFY':
+            print("Rendered result is different from reference image")
+        else:
+            print("Unknown error %r" % error)
+        printMessage('FAILURE', 'FAILED', "{} ({} ms)" .
+                     format(testname, elapsed_ms))
     return error
 
 
@@ -105,30 +158,38 @@ def blend_list(path):
 
 
 def run_all_tests(dirpath):
+    passed_tests = []
     failed_tests = []
     all_files = list(blend_list(dirpath))
     all_files.sort()
+    printMessage('SUCCESS', "==========",
+                 "Running {} tests from 1 test case." . format(len(all_files)))
+    time_start = time.time()
     for filepath in all_files:
         error = run_test(filepath)
+        testname = test_get_name(filepath)
         if error:
             if error == "NO_CYCLES":
-                print("Can't perform tests because Cycles failed to load!")
                 return False
             elif error == "NO_START":
-                print('Can not perform tests because blender fails to start.',
-                      'Make sure INSTALL target was run.')
                 return False
-            elif error == 'VERIFY':
-                pass
-            else:
-                print("Unknown error %r" % error)
-            testname = test_get_name(filepath)
             failed_tests.append(testname)
+        else:
+            passed_tests.append(testname)
+    time_end = time.time()
+    elapsed_ms = int((time_end - time_start) * 1000)
+    print("")
+    printMessage('SUCCESS', "==========",
+                 "{} tests from 1 test case ran. ({} ms total)" .
+                 format(len(all_files), elapsed_ms))
+    printMessage('SUCCESS', 'PASSED', "{} tests." .
+                 format(len(passed_tests)))
     if failed_tests:
+        printMessage('FAILURE', 'FAILED', "{} tests, listed below:" .
+                     format(len(failed_tests)))
         failed_tests.sort()
-        print("\n\nFAILED tests:")
         for test in failed_tests:
-            print("   ", test)
+            printMessage('FAILURE', "FAILED", "{}" . format(test))
         return False
     return True
 
@@ -145,10 +206,14 @@ def main():
     parser = create_argparse()
     args = parser.parse_args()
 
+    global COLORS
     global BLENDER, ROOT, IDIFF
     global TEMP_FILE, TEMP_FILE_MASK, TEST_SCRIPT
     global VERBOSE
 
+    if os.environ.get("CYCLESTEST_COLOR") is not None:
+        COLORS = COLORS_ANSI
+
     BLENDER = args.blender[0]
     ROOT = args.testdir[0]
     IDIFF = args.idiff[0]