diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7f9cca3ed..e52cdb56c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -160,8 +160,7 @@ jobs:
     - run: |
         cargo run test --languages rust,c,go tests/runtime-async \
           --artifacts target/artifacts \
-          --rust-wit-bindgen-path ./crates/guest-rust \
-          --runner "wasmtime -W component-model-async -W component-model-threading -W component-model-async-stackful"
+          --rust-wit-bindgen-path ./crates/guest-rust
 
   test_unit:
     name: Crate Unit Tests
diff --git a/crates/test/src/config.rs b/crates/test/src/config.rs
index 03fc4f928..103e363e4 100644
--- a/crates/test/src/config.rs
+++ b/crates/test/src/config.rs
@@ -64,6 +64,11 @@ pub struct RuntimeTestConfig<T = HashMap<String, toml::Value>> {
     #[serde(default)]
     pub args: StringList,
 
+    /// Extra command line arguments to to pass to Wasmtime, such as enabling
+    /// extra wasm features.
+    #[serde(default)]
+    pub wasmtime_flags: StringList,
+
     /// Language-specific configuration
     //
     // Note that this is an `Option<T>` where `T` defaults to a catch-all hash
diff --git a/crates/test/src/go.rs b/crates/test/src/go.rs
index cf16d3343..0f63bb0b4 100644
--- a/crates/test/src/go.rs
+++ b/crates/test/src/go.rs
@@ -115,10 +115,9 @@ impl LanguageMethods for Go {
 
 fn package_name(package: &str) -> &str {
     package
-        .split_once('\n')
-        .unwrap()
-        .0
-        .strip_prefix("package ")
+        .lines()
+        .filter_map(|l| l.strip_prefix("package "))
+        .next()
         .unwrap()
         .trim()
 }
diff --git a/crates/test/src/lib.rs b/crates/test/src/lib.rs
index e64f13d68..615fb9ce0 100644
--- a/crates/test/src/lib.rs
+++ b/crates/test/src/lib.rs
@@ -193,6 +193,9 @@ struct Component {
 
     /// The contents of the test file itself.
     lang_config: Option<HashMap<String, toml::Value>>,
+
+    /// Runtime flags to wasmtime.
+    wasmtime_flags: config::StringList,
 }
 
 #[derive(Clone)]
@@ -467,6 +470,7 @@ impl Runner {
             kind,
             contents,
             lang_config: config.lang,
+            wasmtime_flags: config.wasmtime_flags,
         })
     }
 
@@ -911,7 +915,17 @@ impl Runner {
         let composed_wasm = dst.join(filename);
         write_if_different(&composed_wasm, &composed)?;
 
-        self.run_command(self.test_runner.command().arg(&composed_wasm))?;
+        let mut cmd = self.test_runner.command();
+        for component in [runner]
+            .into_iter()
+            .chain(test_components.iter().map(|(c, _)| c))
+        {
+            for flag in Vec::from(component.wasmtime_flags.clone()) {
+                cmd.arg(flag);
+            }
+        }
+        cmd.arg(&composed_wasm);
+        self.run_command(&mut cmd)?;
         Ok(())
     }
 
diff --git a/tests/runtime-async/async/cancel-import/runner.c b/tests/runtime-async/async/cancel-import/runner.c
index 3ff39ab83..bb3877f52 100644
--- a/tests/runtime-async/async/cancel-import/runner.c
+++ b/tests/runtime-async/async/cancel-import/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <runner.h>
diff --git a/tests/runtime-async/async/cancel-import/runner.rs b/tests/runtime-async/async/cancel-import/runner.rs
index 08c7ee452..349e1764f 100644
--- a/tests/runtime-async/async/cancel-import/runner.rs
+++ b/tests/runtime-async/async/cancel-import/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/future-cancel-read/runner.c b/tests/runtime-async/async/future-cancel-read/runner.c
index c9e5c2cc4..be17144c2 100644
--- a/tests/runtime-async/async/future-cancel-read/runner.c
+++ b/tests/runtime-async/async/future-cancel-read/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <runner.h>
diff --git a/tests/runtime-async/async/future-cancel-read/runner.rs b/tests/runtime-async/async/future-cancel-read/runner.rs
index 9139ae121..f3880772e 100644
--- a/tests/runtime-async/async/future-cancel-read/runner.rs
+++ b/tests/runtime-async/async/future-cancel-read/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/future-cancel-write-then-read/runner.rs b/tests/runtime-async/async/future-cancel-write-then-read/runner.rs
index aca80cf25..38461e3c2 100644
--- a/tests/runtime-async/async/future-cancel-write-then-read/runner.rs
+++ b/tests/runtime-async/async/future-cancel-write-then-read/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::the_test::f;
diff --git a/tests/runtime-async/async/future-cancel-write/runner.c b/tests/runtime-async/async/future-cancel-write/runner.c
index 0617c7b11..4533b0adf 100644
--- a/tests/runtime-async/async/future-cancel-write/runner.c
+++ b/tests/runtime-async/async/future-cancel-write/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <runner.h>
diff --git a/tests/runtime-async/async/future-cancel-write/runner.rs b/tests/runtime-async/async/future-cancel-write/runner.rs
index c7c827674..4b099fec6 100644
--- a/tests/runtime-async/async/future-cancel-write/runner.rs
+++ b/tests/runtime-async/async/future-cancel-write/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::{read_and_drop, take_then_drop};
diff --git a/tests/runtime-async/async/future-close-after-coming-back/runner.rs b/tests/runtime-async/async/future-close-after-coming-back/runner.rs
index a064decc0..2846f12d4 100644
--- a/tests/runtime-async/async/future-close-after-coming-back/runner.rs
+++ b/tests/runtime-async/async/future-close-after-coming-back/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::the_test::f;
diff --git a/tests/runtime-async/async/future-close-then-receive-read/runner.rs b/tests/runtime-async/async/future-close-then-receive-read/runner.rs
index 7d95d7446..830d844bd 100644
--- a/tests/runtime-async/async/future-close-then-receive-read/runner.rs
+++ b/tests/runtime-async/async/future-close-then-receive-read/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::the_test::{get, set};
diff --git a/tests/runtime-async/async/future-closes-with-error/runner.rs b/tests/runtime-async/async/future-closes-with-error/runner.rs
index bdef3df3c..3e4d214c7 100644
--- a/tests/runtime-async/async/future-closes-with-error/runner.rs
+++ b/tests/runtime-async/async/future-closes-with-error/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::the_test::f;
diff --git a/tests/runtime-async/async/future-write-then-read-comes-back/runner.rs b/tests/runtime-async/async/future-write-then-read-comes-back/runner.rs
index aa788069a..afaea670b 100644
--- a/tests/runtime-async/async/future-write-then-read-comes-back/runner.rs
+++ b/tests/runtime-async/async/future-write-then-read-comes-back/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::the_test::f;
diff --git a/tests/runtime-async/async/future-write-then-read-remote/runner.rs b/tests/runtime-async/async/future-write-then-read-remote/runner.rs
index 46d8b75f5..bbaeeed20 100644
--- a/tests/runtime-async/async/future-write-then-read-remote/runner.rs
+++ b/tests/runtime-async/async/future-write-then-read-remote/runner.rs
@@ -1,4 +1,5 @@
 //@ args = '--async=-all'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 include!(env!("BINDINGS"));
 
diff --git a/tests/runtime-async/async/future-write-then-read-remote/runner2.rs b/tests/runtime-async/async/future-write-then-read-remote/runner2.rs
index 1f47521a7..8f6e261f3 100644
--- a/tests/runtime-async/async/future-write-then-read-remote/runner2.rs
+++ b/tests/runtime-async/async/future-write-then-read-remote/runner2.rs
@@ -1,4 +1,5 @@
 //@ args = '--async=-all'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 include!(env!("BINDINGS"));
 
diff --git a/tests/runtime-async/async/incomplete-writes/runner.go b/tests/runtime-async/async/incomplete-writes/runner.go
index fbacd41ea..039fc33c3 100644
--- a/tests/runtime-async/async/incomplete-writes/runner.go
+++ b/tests/runtime-async/async/incomplete-writes/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
diff --git a/tests/runtime-async/async/pending-import/runner.c b/tests/runtime-async/async/pending-import/runner.c
index 6cd6555fa..2d80f3920 100644
--- a/tests/runtime-async/async/pending-import/runner.c
+++ b/tests/runtime-async/async/pending-import/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <runner.h>
diff --git a/tests/runtime-async/async/pending-import/runner.rs b/tests/runtime-async/async/pending-import/runner.rs
index 1b3a6b536..6acfc28df 100644
--- a/tests/runtime-async/async/pending-import/runner.rs
+++ b/tests/runtime-async/async/pending-import/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/ping-pong/runner.c b/tests/runtime-async/async/ping-pong/runner.c
index c1dcfae86..02a76e655 100644
--- a/tests/runtime-async/async/ping-pong/runner.c
+++ b/tests/runtime-async/async/ping-pong/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <string.h>
diff --git a/tests/runtime-async/async/ping-pong/runner.go b/tests/runtime-async/async/ping-pong/runner.go
index a8ffe8658..4709858e4 100644
--- a/tests/runtime-async/async/ping-pong/runner.go
+++ b/tests/runtime-async/async/ping-pong/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
diff --git a/tests/runtime-async/async/ping-pong/runner.rs b/tests/runtime-async/async/ping-pong/runner.rs
index 26a36d4c9..d190b6678 100644
--- a/tests/runtime-async/async/ping-pong/runner.rs
+++ b/tests/runtime-async/async/ping-pong/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::{ping, pong};
diff --git a/tests/runtime-async/async/rust-cross-task-wakeup/runner.rs b/tests/runtime-async/async/rust-cross-task-wakeup/runner.rs
index 2abf545c0..cff7d26e9 100644
--- a/tests/runtime-async/async/rust-cross-task-wakeup/runner.rs
+++ b/tests/runtime-async/async/rust-cross-task-wakeup/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/rust-lowered-send/runner.rs b/tests/runtime-async/async/rust-lowered-send/runner.rs
index fb165ab97..beebce8ba 100644
--- a/tests/runtime-async/async/rust-lowered-send/runner.rs
+++ b/tests/runtime-async/async/rust-lowered-send/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::i::*;
diff --git a/tests/runtime-async/async/simple-call-import/runner.c b/tests/runtime-async/async/simple-call-import/runner.c
index 5c1d27efe..71053d82c 100644
--- a/tests/runtime-async/async/simple-call-import/runner.c
+++ b/tests/runtime-async/async/simple-call-import/runner.c
@@ -1,4 +1,6 @@
 //@ args = '--rename a:b/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 #include <assert.h>
 #include <runner.h>
 
diff --git a/tests/runtime-async/async/simple-call-import/runner.go b/tests/runtime-async/async/simple-call-import/runner.go
index e0fdeea3d..473986f90 100644
--- a/tests/runtime-async/async/simple-call-import/runner.go
+++ b/tests/runtime-async/async/simple-call-import/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import test "wit_component/a_b_i"
diff --git a/tests/runtime-async/async/simple-call-import/runner.rs b/tests/runtime-async/async/simple-call-import/runner.rs
index 4d84b32f2..79142fe97 100644
--- a/tests/runtime-async/async/simple-call-import/runner.rs
+++ b/tests/runtime-async/async/simple-call-import/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 struct Component;
diff --git a/tests/runtime-async/async/simple-future/runner.c b/tests/runtime-async/async/simple-future/runner.c
index b32ec8a17..b5d716f54 100644
--- a/tests/runtime-async/async/simple-future/runner.c
+++ b/tests/runtime-async/async/simple-future/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <runner.h>
 #include <assert.h>
diff --git a/tests/runtime-async/async/simple-future/runner.cs b/tests/runtime-async/async/simple-future/runner.cs
index 7f06673b8..c84b1d141 100644
--- a/tests/runtime-async/async/simple-future/runner.cs
+++ b/tests/runtime-async/async/simple-future/runner.cs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 using System;
 using System.Runtime.InteropServices;
 using System.Diagnostics;
@@ -29,7 +31,7 @@ public static Task Run()
 
             writer.Dispose();
             set.Dispose();
-        }   
+        }
 
         {
             var (reader, writer) = IIImports.FutureNew();
@@ -61,4 +63,4 @@ public static int RunCallback()
     {
         throw new NotImplementedException();
     }
-}
\ No newline at end of file
+}
diff --git a/tests/runtime-async/async/simple-future/runner.go b/tests/runtime-async/async/simple-future/runner.go
index 8408a60ad..cd0772713 100644
--- a/tests/runtime-async/async/simple-future/runner.go
+++ b/tests/runtime-async/async/simple-future/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
@@ -54,9 +56,9 @@ func Run() {
 		close(syncBarrier)
 
 		go func() {
-			// If this is omitted, the host will see that the "rx.Read" operations aren't paired with 
-			// a "tx.Write" and will result in a "wasm trap: deadlock detected" error. Additionally, 
-			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from 
+			// If this is omitted, the host will see that the "rx.Read" operations aren't paired with
+			// a "tx.Write" and will result in a "wasm trap: deadlock detected" error. Additionally,
+			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from
 			// concurrent reads, and not from other scenarios that result in a nil handle.
 			tx.Write(wit_types.Unit{})
 		}()
@@ -85,9 +87,9 @@ func Run() {
 		close(syncBarrier)
 
 		go func() {
-			// If this is omitted, the host will see that the "tx.Write" operations aren't paired with 
-			// an "rx.Read" and will result in a "wasm trap: deadlock detected" error. Additionally, 
-			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from 
+			// If this is omitted, the host will see that the "tx.Write" operations aren't paired with
+			// an "rx.Read" and will result in a "wasm trap: deadlock detected" error. Additionally,
+			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from
 			// concurrent writes, and not from other scenarios that result in a nil handle.
 			rx.Read()
 		}()
diff --git a/tests/runtime-async/async/simple-future/runner.rs b/tests/runtime-async/async/simple-future/runner.rs
index bb22510fa..1b1140fc7 100644
--- a/tests/runtime-async/async/simple-future/runner.rs
+++ b/tests/runtime-async/async/simple-future/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/simple-import-params-results/runner.c b/tests/runtime-async/async/simple-import-params-results/runner.c
index 2f4d0976f..2dc4e4548 100644
--- a/tests/runtime-async/async/simple-import-params-results/runner.c
+++ b/tests/runtime-async/async/simple-import-params-results/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename a:b/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <assert.h>
 #include <runner.h>
diff --git a/tests/runtime-async/async/simple-import-params-results/runner.cs b/tests/runtime-async/async/simple-import-params-results/runner.cs
index 1c6bb83c4..5d96913df 100644
--- a/tests/runtime-async/async/simple-import-params-results/runner.cs
+++ b/tests/runtime-async/async/simple-import-params-results/runner.cs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 using System;
 using System.Runtime.InteropServices;
 using System.Diagnostics;
diff --git a/tests/runtime-async/async/simple-import-params-results/runner.go b/tests/runtime-async/async/simple-import-params-results/runner.go
index f47ca7789..11f9db2c0 100644
--- a/tests/runtime-async/async/simple-import-params-results/runner.go
+++ b/tests/runtime-async/async/simple-import-params-results/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
diff --git a/tests/runtime-async/async/simple-import-params-results/runner.rs b/tests/runtime-async/async/simple-import-params-results/runner.rs
index 3e10e0870..d684310c7 100644
--- a/tests/runtime-async/async/simple-import-params-results/runner.rs
+++ b/tests/runtime-async/async/simple-import-params-results/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::a::b::i::*;
diff --git a/tests/runtime-async/async/simple-pending-import/runner.c b/tests/runtime-async/async/simple-pending-import/runner.c
index c187f0636..36fb6a86d 100644
--- a/tests/runtime-async/async/simple-pending-import/runner.c
+++ b/tests/runtime-async/async/simple-pending-import/runner.c
@@ -1,4 +1,6 @@
 //@ args = '--rename a:b/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 #include <assert.h>
 #include <runner.h>
 
diff --git a/tests/runtime-async/async/simple-pending-import/runner.go b/tests/runtime-async/async/simple-pending-import/runner.go
index e0fdeea3d..473986f90 100644
--- a/tests/runtime-async/async/simple-pending-import/runner.go
+++ b/tests/runtime-async/async/simple-pending-import/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import test "wit_component/a_b_i"
diff --git a/tests/runtime-async/async/simple-pending-import/runner.rs b/tests/runtime-async/async/simple-pending-import/runner.rs
index 4d84b32f2..79142fe97 100644
--- a/tests/runtime-async/async/simple-pending-import/runner.rs
+++ b/tests/runtime-async/async/simple-pending-import/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 struct Component;
diff --git a/tests/runtime-async/async/simple-stream-payload/runner.c b/tests/runtime-async/async/simple-stream-payload/runner.c
index 1480104f2..472cf5a3f 100644
--- a/tests/runtime-async/async/simple-stream-payload/runner.c
+++ b/tests/runtime-async/async/simple-stream-payload/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <runner.h>
 #include <assert.h>
diff --git a/tests/runtime-async/async/simple-stream-payload/runner.go b/tests/runtime-async/async/simple-stream-payload/runner.go
index 251be8758..006611c57 100644
--- a/tests/runtime-async/async/simple-stream-payload/runner.go
+++ b/tests/runtime-async/async/simple-stream-payload/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
diff --git a/tests/runtime-async/async/simple-stream-payload/runner.rs b/tests/runtime-async/async/simple-stream-payload/runner.rs
index d5e98fae0..b05bb574e 100644
--- a/tests/runtime-async/async/simple-stream-payload/runner.rs
+++ b/tests/runtime-async/async/simple-stream-payload/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/simple-stream/runner.c b/tests/runtime-async/async/simple-stream/runner.c
index 0784a6403..54c1fef4d 100644
--- a/tests/runtime-async/async/simple-stream/runner.c
+++ b/tests/runtime-async/async/simple-stream/runner.c
@@ -1,4 +1,5 @@
 //@ args = '--rename my:test/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
 
 #include <runner.h>
 #include <assert.h>
diff --git a/tests/runtime-async/async/simple-stream/runner.go b/tests/runtime-async/async/simple-stream/runner.go
index 919b000b1..ba450c6b8 100644
--- a/tests/runtime-async/async/simple-stream/runner.go
+++ b/tests/runtime-async/async/simple-stream/runner.go
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 package export_wit_world
 
 import (
@@ -53,9 +55,9 @@ func Run() {
 		close(syncBarrier)
 
 		go func() {
-			// If this is omitted, the host will see that the "rx.Read" operations aren't paired with 
-			// a "tx.WriteAll" and will result in a "wasm trap: deadlock detected" error. Additionally, 
-			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from 
+			// If this is omitted, the host will see that the "rx.Read" operations aren't paired with
+			// a "tx.WriteAll" and will result in a "wasm trap: deadlock detected" error. Additionally,
+			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from
 			// concurrent reads, and not from other scenarios that result in a nil handle.
 			tx.WriteAll([]wit_types.Unit{wit_types.Unit{}})
 		}()
@@ -84,9 +86,9 @@ func Run() {
 		close(syncBarrier)
 
 		go func() {
-			// If this is omitted, the host will see that the "tx.WriteAll" operations aren't paired with 
-			// an "rx.Read" and will result in a "wasm trap: deadlock detected" error. Additionally, 
-			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from 
+			// If this is omitted, the host will see that the "tx.WriteAll" operations aren't paired with
+			// an "rx.Read" and will result in a "wasm trap: deadlock detected" error. Additionally,
+			// this is placed after "close(syncBarrier)" to ensure that the panics are resulting from
 			// concurrent writes, and not from other scenarios that result in a nil handle.
 			result := make([]wit_types.Unit, 1)
 			rx.Read(result)
diff --git a/tests/runtime-async/async/simple-stream/runner.rs b/tests/runtime-async/async/simple-stream/runner.rs
index 54da557d7..8c0c7b830 100644
--- a/tests/runtime-async/async/simple-stream/runner.rs
+++ b/tests/runtime-async/async/simple-stream/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 use crate::my::test::i::*;
diff --git a/tests/runtime-async/async/simple-yield/runner.c b/tests/runtime-async/async/simple-yield/runner.c
index d27c3bc15..b74b9f8cc 100644
--- a/tests/runtime-async/async/simple-yield/runner.c
+++ b/tests/runtime-async/async/simple-yield/runner.c
@@ -1,4 +1,6 @@
 //@ args = '--rename a:b/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 #include <assert.h>
 #include <runner.h>
 
diff --git a/tests/runtime-async/async/simple-yield/runner.rs b/tests/runtime-async/async/simple-yield/runner.rs
index 4d84b32f2..79142fe97 100644
--- a/tests/runtime-async/async/simple-yield/runner.rs
+++ b/tests/runtime-async/async/simple-yield/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 struct Component;
diff --git a/tests/runtime-async/async/threading-builtins/runner.c b/tests/runtime-async/async/threading-builtins/runner.c
index ba55630de..ab4805c8f 100644
--- a/tests/runtime-async/async/threading-builtins/runner.c
+++ b/tests/runtime-async/async/threading-builtins/runner.c
@@ -1,4 +1,6 @@
 //@ args = '--rename a:b/i=test --async=-run'
+//@ wasmtime-flags = '-Wcomponent-model-async -Wcomponent-model-threading -Wcomponent-model-async-stackful'
+
 #include <assert.h>
 #include <runner.h>
 
diff --git a/tests/runtime-async/async/yield-loop-receives-events/runner.rs b/tests/runtime-async/async/yield-loop-receives-events/runner.rs
index 6398f37ec..d6435ffd1 100644
--- a/tests/runtime-async/async/yield-loop-receives-events/runner.rs
+++ b/tests/runtime-async/async/yield-loop-receives-events/runner.rs
@@ -1,3 +1,5 @@
+//@ wasmtime-flags = '-Wcomponent-model-async'
+
 include!(env!("BINDINGS"));
 
 struct Component;