unions tests: fix bugs in wasm.rs and host.py

i am skeptical about the python embedding, these tests shouldnt have
passed before

Author: Pat Hickey

tests/runtime/unions/host.py

@@ -69,7 +69,7 @@ def add_one_float(self, num: i.AllFloats) -> i.AllFloats:
     def replace_first_char(self, text: i.AllText, letter: str) -> i.AllText:
         if isinstance(text, i.AllText0):
             return i.AllText0(letter)
-        if isinstance(text, i.AllFloats1):
+        if isinstance(text, i.AllText1):
             return i.AllText1(letter + text.value[1:])
         else:
             raise ValueError("Invalid input value!")
@@ -111,7 +111,7 @@ def identify_float(self, num: i.AllFloats) -> int:
     def identify_text(self, text: i.AllText) -> int:
         if isinstance(text, i.AllText0):
             return 0
-        if isinstance(text, i.AllFloats1):
+        if isinstance(text, i.AllText1):
             return 1
         else:
             raise ValueError("Invalid input value!")

tests/runtime/unions/wasm.rs

@@ -138,7 +138,7 @@ impl exports::Exports for Exports {
 
         assert!(matches!(identify_duplicated(DuplicatedS32::I320(0)), 0));
         assert!(matches!(identify_duplicated(DuplicatedS32::I321(0)), 1));
-        assert!(matches!(identify_duplicated(DuplicatedS32::I321(0)), 2));
+        assert!(matches!(identify_duplicated(DuplicatedS32::I322(0)), 2));
 
         // Distinguishable
         assert!(