1 files changed, 183 insertions, 0 deletions
diff --git a/toolkit/components/uniffi-fixtures/rondpoint/tests/bindings/test_rondpoint.py b/toolkit/components/uniffi-fixtures/rondpoint/tests/bindings/test_rondpoint.py
new file mode 100644
index 0000000000..df3e3fab18
--- /dev/null
+++ b/toolkit/components/uniffi-fixtures/rondpoint/tests/bindings/test_rondpoint.py
@@ -0,0 +1,183 @@
+import ctypes
+import sys
+
+from rondpoint import (
+    Dictionnaire,
+    Enumeration,
+    EnumerationAvecDonnees,
+    Retourneur,
+    Stringifier,
+    copie_carte,
+    copie_dictionnaire,
+    copie_enumeration,
+    copie_enumerations,
+    switcheroo,
+)
+
+dico = Dictionnaire(
+    un=Enumeration.DEUX, deux=True, petit_nombre=0, gros_nombre=123456789
+)
+copyDico = copie_dictionnaire(dico)
+assert dico == copyDico
+
+assert copie_enumeration(Enumeration.DEUX) == Enumeration.DEUX
+assert copie_enumerations([Enumeration.UN, Enumeration.DEUX]) == [
+    Enumeration.UN,
+    Enumeration.DEUX,
+]
+assert copie_carte(
+    {
+        "0": EnumerationAvecDonnees.ZERO(),
+        "1": EnumerationAvecDonnees.UN(1),
+        "2": EnumerationAvecDonnees.DEUX(2, "deux"),
+    }
+) == {
+    "0": EnumerationAvecDonnees.ZERO(),
+    "1": EnumerationAvecDonnees.UN(1),
+    "2": EnumerationAvecDonnees.DEUX(2, "deux"),
+}
+
+assert switcheroo(False) is True
+
+assert EnumerationAvecDonnees.ZERO() != EnumerationAvecDonnees.UN(1)
+assert EnumerationAvecDonnees.UN(1) == EnumerationAvecDonnees.UN(1)
+assert EnumerationAvecDonnees.UN(1) != EnumerationAvecDonnees.UN(2)
+
+# Test the roundtrip across the FFI.
+# This shows that the values we send come back in exactly the same state as we sent them.
+# i.e. it shows that lowering from python and lifting into rust is symmetrical with
+#      lowering from rust and lifting into python.
+rt = Retourneur()
+
+
+def affirmAllerRetour(vals, identique):
+    for v in vals:
+        id_v = identique(v)
+        assert id_v == v, f"Round-trip failure: {v} => {id_v}"
+
+
+MIN_I8 = -1 * 2**7
+MAX_I8 = 2**7 - 1
+MIN_I16 = -1 * 2**15
+MAX_I16 = 2**15 - 1
+MIN_I32 = -1 * 2**31
+MAX_I32 = 2**31 - 1
+MIN_I64 = -1 * 2**31
+MAX_I64 = 2**31 - 1
+
+# Python floats are always doubles, so won't round-trip through f32 correctly.
+# This truncates them appropriately.
+F32_ONE_THIRD = ctypes.c_float(1.0 / 3).value
+
+# Booleans
+affirmAllerRetour([True, False], rt.identique_boolean)
+
+# Bytes.
+affirmAllerRetour([MIN_I8, -1, 0, 1, MAX_I8], rt.identique_i8)
+affirmAllerRetour([0x00, 0x12, 0xFF], rt.identique_u8)
+
+# Shorts
+affirmAllerRetour([MIN_I16, -1, 0, 1, MAX_I16], rt.identique_i16)
+affirmAllerRetour([0x0000, 0x1234, 0xFFFF], rt.identique_u16)
+
+# Ints
+affirmAllerRetour([MIN_I32, -1, 0, 1, MAX_I32], rt.identique_i32)
+affirmAllerRetour([0x00000000, 0x12345678, 0xFFFFFFFF], rt.identique_u32)
+
+# Longs
+affirmAllerRetour([MIN_I64, -1, 0, 1, MAX_I64], rt.identique_i64)
+affirmAllerRetour(
+    [0x0000000000000000, 0x1234567890ABCDEF, 0xFFFFFFFFFFFFFFFF], rt.identique_u64
+)
+
+# Floats
+affirmAllerRetour([0.0, 0.5, 0.25, 1.0, F32_ONE_THIRD], rt.identique_float)
+
+# Doubles
+affirmAllerRetour(
+    [0.0, 0.5, 0.25, 1.0, 1.0 / 3, sys.float_info.max, sys.float_info.min],
+    rt.identique_double,
+)
+
+# Strings
+affirmAllerRetour(
+    [
+        "",
+        "abc",
+        "été",
+        "ښي لاس ته لوستلو لوستل",
+        "😻emoji 👨‍👧‍👦multi-emoji, 🇨🇭a flag, a canal, panama",
+    ],
+    rt.identique_string,
+)
+
+# Test one way across the FFI.
+#
+# We send one representation of a value to lib.rs, and it transforms it into another, a string.
+# lib.rs sends the string back, and then we compare here in python.
+#
+# This shows that the values are transformed into strings the same way in both python and rust.
+# i.e. if we assume that the string return works (we test this assumption elsewhere)
+#      we show that lowering from python and lifting into rust has values that both python and rust
+#      both stringify in the same way. i.e. the same values.
+#
+# If we roundtripping proves the symmetry of our lowering/lifting from here to rust, and lowering/lifting from rust to here,
+# and this convinces us that lowering/lifting from here to rust is correct, then
+# together, we've shown the correctness of the return leg.
+st = Stringifier()
+
+
+def affirmEnchaine(vals, toString, rustyStringify=lambda v: str(v).lower()):
+    for v in vals:
+        str_v = toString(v)
+        assert rustyStringify(v) == str_v, f"String compare error {v} => {str_v}"
+
+
+# Test the efficacy of the string transport from rust. If this fails, but everything else
+# works, then things are very weird.
+wellKnown = st.well_known_string("python")
+assert "uniffi 💚 python!" == wellKnown
+
+# Booleans
+affirmEnchaine([True, False], st.to_string_boolean)
+
+# Bytes.
+affirmEnchaine([MIN_I8, -1, 0, 1, MAX_I8], st.to_string_i8)
+affirmEnchaine([0x00, 0x12, 0xFF], st.to_string_u8)
+
+# Shorts
+affirmEnchaine([MIN_I16, -1, 0, 1, MAX_I16], st.to_string_i16)
+affirmEnchaine([0x0000, 0x1234, 0xFFFF], st.to_string_u16)
+
+# Ints
+affirmEnchaine([MIN_I32, -1, 0, 1, MAX_I32], st.to_string_i32)
+affirmEnchaine([0x00000000, 0x12345678, 0xFFFFFFFF], st.to_string_u32)
+
+# Longs
+affirmEnchaine([MIN_I64, -1, 0, 1, MAX_I64], st.to_string_i64)
+affirmEnchaine(
+    [0x0000000000000000, 0x1234567890ABCDEF, 0xFFFFFFFFFFFFFFFF], st.to_string_u64
+)
+
+
+# Floats
+def rustyFloatToStr(v):
+    """Stringify a float in the same way that rust seems to."""
+    # Rust doesn't include the decimal part of whole enumber floats when stringifying.
+    if int(v) == v:
+        return str(int(v))
+    return str(v)
+
+
+affirmEnchaine([0.0, 0.5, 0.25, 1.0], st.to_string_float, rustyFloatToStr)
+assert (
+    st.to_string_float(F32_ONE_THIRD) == "0.33333334"
+)  # annoyingly different string repr
+
+# Doubles
+# TODO: float_info.max/float_info.min don't stringify-roundtrip properly yet, TBD.
+affirmEnchaine(
+    [0.0, 0.5, 0.25, 1.0, 1.0 / 3],
+    st.to_string_double,
+    rustyFloatToStr,
+)