diff --git a/engine/src/flutter/tests/TestExpectations b/engine/src/flutter/tests/TestExpectations
index 0547a15665..a19c7b0814 100644
--- a/engine/src/flutter/tests/TestExpectations
+++ b/engine/src/flutter/tests/TestExpectations
@@ -3,12 +3,12 @@
crbug.com/1 editing/ [ Skip ]
# These tests require gc() to be exposed.
-crbug.com/1 mutation-observer/observer-wrapper-dropoff-transient.html [ Skip ]
-crbug.com/1 mutation-observer/observer-wrapper-dropoff.html [ Skip ]
-crbug.com/1 mutation-observer/transient-gc-crash.html [ Skip ]
-crbug.com/1 mutation-observer/weak-callback-gc-crash.html [ Skip ]
+crbug.com/1 mutation-observer/observer-wrapper-dropoff-transient.sky [ Skip ]
+crbug.com/1 mutation-observer/observer-wrapper-dropoff.sky [ Skip ]
+crbug.com/1 mutation-observer/transient-gc-crash.sky [ Skip ]
+crbug.com/1 mutation-observer/weak-callback-gc-crash.sky [ Skip ]
# We need to land the new inspector backend
Bug(abarth) inspector [ Skip ]
-Bug(abarth) services/network.html [ Crash ]
+Bug(abarth) services/network.sky [ Crash ]
diff --git a/engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.html b/engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.sky
similarity index 81%
rename from engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.html
rename to engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.sky
index 067ada4143..5c4cd1ac39 100644
--- a/engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.html
+++ b/engine/src/flutter/tests/custom-elements/constructor-calls-created-synchronously.sky
@@ -1,6 +1,6 @@
-
-
+
+
-
diff --git a/engine/src/flutter/tests/modules/basic.sky b/engine/src/flutter/tests/modules/basic.sky
new file mode 100644
index 0000000000..17d6b6f0a2
--- /dev/null
+++ b/engine/src/flutter/tests/modules/basic.sky
@@ -0,0 +1,8 @@
+
+
+
+FAIL
+
+
diff --git a/engine/src/flutter/tests/modules/imports-can-import-expected.txt b/engine/src/flutter/tests/modules/imports-can-import-expected.txt
index 6bb0ab560e..e214eaa94c 100644
--- a/engine/src/flutter/tests/modules/imports-can-import-expected.txt
+++ b/engine/src/flutter/tests/modules/imports-can-import-expected.txt
@@ -1 +1 @@
-{"message":"PASS: pass.html succesfully exported this string."}
+{"message":"PASS: pass.sky succesfully exported this string."}
diff --git a/engine/src/flutter/tests/modules/imports-can-import.html b/engine/src/flutter/tests/modules/imports-can-import.sky
similarity index 65%
rename from engine/src/flutter/tests/modules/imports-can-import.html
rename to engine/src/flutter/tests/modules/imports-can-import.sky
index 7983f78e0d..ff84857515 100644
--- a/engine/src/flutter/tests/modules/imports-can-import.html
+++ b/engine/src/flutter/tests/modules/imports-can-import.sky
@@ -1,5 +1,5 @@
-
+
FAIL
diff --git a/engine/src/flutter/tests/modules/resources/intermediate.sky b/engine/src/flutter/tests/modules/resources/intermediate.sky
new file mode 100644
index 0000000000..57fc7f5731
--- /dev/null
+++ b/engine/src/flutter/tests/modules/resources/intermediate.sky
@@ -0,0 +1,7 @@
+
+
+
diff --git a/engine/src/flutter/tests/modules/resources/pass.html b/engine/src/flutter/tests/modules/resources/pass.html
deleted file mode 100644
index 75631167c9..0000000000
--- a/engine/src/flutter/tests/modules/resources/pass.html
+++ /dev/null
@@ -1,3 +0,0 @@
-
diff --git a/engine/src/flutter/tests/modules/resources/pass.sky b/engine/src/flutter/tests/modules/resources/pass.sky
new file mode 100644
index 0000000000..c98a6a9dda
--- /dev/null
+++ b/engine/src/flutter/tests/modules/resources/pass.sky
@@ -0,0 +1,3 @@
+
diff --git a/engine/src/flutter/tests/mutation-observer/callback-arguments.html b/engine/src/flutter/tests/mutation-observer/callback-arguments.sky
similarity index 83%
rename from engine/src/flutter/tests/mutation-observer/callback-arguments.html
rename to engine/src/flutter/tests/mutation-observer/callback-arguments.sky
index fefda766d1..3fbdda491b 100644
--- a/engine/src/flutter/tests/mutation-observer/callback-arguments.html
+++ b/engine/src/flutter/tests/mutation-observer/callback-arguments.sky
@@ -1,6 +1,6 @@
-
-
+
+