Make sure there aren't version checks that panic with minimum support…

…ed version

src/service_protocol/encoding.rs

@@ -36,10 +36,10 @@ pub struct Encoder {}
 
 impl Encoder {
     pub fn new(service_protocol_version: Version) -> Self {
-        assert_eq!(
-            service_protocol_version,
-            Version::maximum_supported_version(),
-            "Encoder only supports service protocol version {:?}",
+        assert!(
+            service_protocol_version >= Version::minimum_supported_version(),
+            "Encoder only supports service protocol version {:?} <= x <= {:?}",
+            Version::minimum_supported_version(),
             Version::maximum_supported_version()
         );
         Self {}
@@ -105,10 +105,10 @@ pub struct Decoder {
 
 impl Decoder {
     pub fn new(service_protocol_version: Version) -> Self {
-        assert_eq!(
-            service_protocol_version,
-            Version::maximum_supported_version(),
-            "Decoder only supports service protocol version {:?}",
+        assert!(
+            service_protocol_version >= Version::minimum_supported_version(),
+            "Decoder only supports service protocol version {:?} <= x <= {:?}",
+            Version::minimum_supported_version(),
             Version::maximum_supported_version()
         );
         Self {

src/tests/mod.rs

@@ -217,3 +217,8 @@ fn take_output_on_newly_initialized_vm() {
         eq(TakeOutputResult::Buffer(Bytes::default()))
     );
 }
+
+#[test]
+fn instantiate_core_vm_minimum_supported_version() {
+    CoreVM::mock_init(Version::minimum_supported_version());
+}

src/vm/mod.rs

@@ -159,7 +159,7 @@ impl super::VM for CoreVM {
             .ok_or(errors::MISSING_CONTENT_TYPE)?
             .parse::<Version>()?;
 
-        if version != Version::maximum_supported_version() {
+        if version < Version::minimum_supported_version() {
             return Err(Error::new(
                 errors::codes::UNSUPPORTED_MEDIA_TYPE,
                 format!("Unsupported protocol version {:?}", version),