test: Log support map on test startup (#6638)

When running tests with logging enabled, the logs will now always
contain a full map of media features supported on this platform.

---------

Co-authored-by: Álvaro Velad Galván <ladvan91@hotmail.com>

test/test/boot.js

@@ -373,6 +373,7 @@ function configureJasmineEnvironment() {
   // Reset decoding config cache after each test.
   afterEach(/** @suppress {accessControls} */ () => {
     shaka.util.StreamUtils.decodingConfigCache_ = {};
+    shaka.media.Capabilities.MediaSourceTypeSupportMap.clear();
   });
 
   // Code in karma-jasmine's adapter will malform test failures when the
@@ -425,10 +426,21 @@ function configureJasmineEnvironment() {
   };
 }
 
+async function logSupport() {
+  try {
+    const support = await shaka.Player.probeSupport();
+    console.log('Platform support:', JSON.stringify(support, null, 2));
+    // eslint-disable-next-line no-restricted-syntax
+  } catch (error) {
+    console.error('Support check failed at boot!', error);
+  }
+}
+
 /**
  * Set up the Shaka Player test environment.
+ * @return {!Promise}
  */
-function setupTestEnvironment() {
+async function setupTestEnvironment() {
   failTestsOnFailedAssertions();
   failTestsOnNamespacedElementOrAttributeNames();
   failTestsOnUnhandledErrors();
@@ -440,6 +452,8 @@ function setupTestEnvironment() {
   // detected.
   shaka.polyfill.installAll();
 
+  await logSupport();
+
   configureJasmineEnvironment();
 }
 
@@ -499,7 +513,7 @@ window.__karma__.start = async () => {
   // See https://github.com/shaka-project/shaka-player/issues/4094
 
   try {
-    setupTestEnvironment();
+    await setupTestEnvironment();
     console.log('Set up test environment.');
     await loadTests();
     console.log('Loaded all tests.');