first pass at splitting out a test, making ctx/errno reusable

tests/ctx.rs

@@ -0,0 +1,34 @@
+use wiggle_runtime::GuestError;
+
+pub struct WasiCtx {
+    pub guest_errors: Vec<GuestError>,
+}
+
+impl WasiCtx {
+    pub fn new() -> Self {
+        Self {
+            guest_errors: vec![],
+        }
+    }
+}
+
+// Errno is used as a first return value in the functions above, therefore
+// it must implement GuestErrorType with type Context = WasiCtx.
+// The context type should let you do logging or debugging or whatever you need
+// with these errors. We just push them to vecs.
+#[macro_export]
+macro_rules! impl_errno {
+    ( $errno:ty ) => {
+        impl wiggle_runtime::GuestErrorType for $errno {
+            type Context = WasiCtx;
+            fn success() -> $errno {
+                <$errno>::Ok
+            }
+            fn from_error(e: GuestError, ctx: &mut WasiCtx) -> $errno {
+                eprintln!("GUEST ERROR: {:?}", e);
+                ctx.guest_errors.push(e);
+                types::Errno::InvalidArg
+            }
+        }
+    };
+}

tests/errno.witx

@@ -0,0 +1,8 @@
+(typename $errno
+    (enum u32
+        $ok
+        $invalid_arg
+        $dont_want_to
+        $physically_unable
+        $picket_line))
+

tests/main.rs

@@ -11,24 +11,12 @@ wiggle_generate::from_witx!({
     ctx: WasiCtx,
 });
 
-pub struct WasiCtx {
-    guest_errors: Vec<GuestError>,
-}
+mod ctx;
+use ctx::WasiCtx;
 
-impl WasiCtx {
-    pub fn new() -> Self {
-        Self {
-            guest_errors: vec![],
-        }
-    }
-}
+impl_errno!(types::Errno);
 
 impl foo::Foo for WasiCtx {
-    fn bar(&mut self, an_int: u32, an_float: f32) -> Result<(), types::Errno> {
-        println!("BAR: {} {}", an_int, an_float);
-        Ok(())
-    }
-
     fn baz(
         &mut self,
         input1: types::Excuse,
@@ -154,22 +142,6 @@ impl foo::Foo for WasiCtx {
         Ok(res)
     }
 }
-// Errno is used as a first return value in the functions above, therefore
-// it must implement GuestErrorType with type Context = WasiCtx.
-// The context type should let you do logging or debugging or whatever you need
-// with these errors. We just push them to vecs.
-impl GuestErrorType for types::Errno {
-    type Context = WasiCtx;
-    fn success() -> types::Errno {
-        types::Errno::Ok
-    }
-    fn from_error(e: GuestError, ctx: &mut WasiCtx) -> types::Errno {
-        eprintln!("GUEST ERROR: {:?}", e);
-        ctx.guest_errors.push(e);
-        types::Errno::InvalidArg
-    }
-}
-
 #[derive(Debug)]
 struct BatExercise {
     pub input: u32,

tests/test.witx

@@ -1,10 +1,4 @@
-(typename $errno
-    (enum u32
-        $ok
-        $invalid_arg
-        $dont_want_to
-        $physically_unable
-        $picket_line))
+(use "errno.witx")
 
 (typename $excuse
   (enum u8
@@ -44,10 +38,6 @@
 (typename $excuse_array (array (@witx pointer $excuse)))
 
 (module $foo
-  (@interface func (export "bar")
-    (param $an_int u32)
-    (param $an_float f32)
-    (result $error $errno))
   (@interface func (export "baz")
     (param $an_excuse $excuse)
     (param $an_excuse_by_reference (@witx pointer $excuse))

tests/trivial.rs

@@ -0,0 +1,61 @@
+use proptest::prelude::*;
+use std::convert::TryFrom;
+use wiggle_runtime::{
+    GuestArray, GuestError, GuestErrorType, GuestPtr, GuestPtrMut, GuestRef, GuestRefMut,
+};
+use wiggle_test::{HostMemory, MemArea};
+
+mod ctx;
+use ctx::WasiCtx;
+
+wiggle_generate::from_witx!({
+    witx: ["tests/trivial.witx"],
+    ctx: WasiCtx,
+});
+
+impl_errno!(types::Errno);
+
+impl trivial::Trivial for WasiCtx {
+    fn int_float_args(&mut self, an_int: u32, an_float: f32) -> Result<(), types::Errno> {
+        println!("INT FLOAT ARGS: {} {}", an_int, an_float);
+        Ok(())
+    }
+}
+
+// There's nothing meaningful to test here - this just demonstrates the test machinery
+
+#[derive(Debug)]
+struct IntFloatExercise {
+    pub an_int: u32,
+    pub an_float: f32,
+}
+
+impl IntFloatExercise {
+    pub fn test(&self) {
+        let mut ctx = WasiCtx::new();
+        let mut host_memory = HostMemory::new();
+        let mut guest_memory = host_memory.guest_memory();
+
+        let e = trivial::int_float_args(
+            &mut ctx,
+            &mut guest_memory,
+            self.an_int as i32,
+            self.an_float,
+        );
+
+        assert_eq!(e, types::Errno::Ok.into(), "int_float_args error");
+    }
+
+    pub fn strat() -> BoxedStrategy<Self> {
+        (prop::num::u32::ANY, prop::num::f32::ANY)
+            .prop_map(|(an_int, an_float)| IntFloatExercise { an_int, an_float })
+            .boxed()
+    }
+}
+
+proptest! {
+    #[test]
+    fn int_float_exercise(e in IntFloatExercise::strat()) {
+        e.test()
+    }
+}

tests/trivial.witx

@@ -0,0 +1,8 @@
+(use "errno.witx")
+
+(module $trivial
+  (@interface func (export "int_float_args")
+    (param $an_int u32)
+    (param $an_float f32)
+    (result $error $errno))
+)