Vendor things

third-party/vendor/num_enum-0.5.11/tests/from_primitive.rs

@@ -0,0 +1,144 @@
+use ::std::convert::TryFrom;
+
+use ::num_enum::{FromPrimitive, TryFromPrimitive};
+
+// Guard against https://github.com/illicitonion/num_enum/issues/27
+mod alloc {}
+mod core {}
+mod num_enum {}
+mod std {}
+
+#[test]
+fn has_from_primitive_number_u64() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u64)]
+    enum Enum {
+        Zero = 0,
+        #[num_enum(default)]
+        NonZero = 1,
+    }
+
+    let zero = Enum::from_primitive(0_u64);
+    assert_eq!(zero, Enum::Zero);
+
+    let one = Enum::from_primitive(1_u64);
+    assert_eq!(one, Enum::NonZero);
+
+    let two = Enum::from_primitive(2_u64);
+    assert_eq!(two, Enum::NonZero);
+}
+
+#[test]
+fn has_from_primitive_number() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u8)]
+    enum Enum {
+        Zero = 0,
+        #[num_enum(default)]
+        NonZero = 1,
+    }
+
+    let zero = Enum::from_primitive(0_u8);
+    assert_eq!(zero, Enum::Zero);
+
+    let one = Enum::from_primitive(1_u8);
+    assert_eq!(one, Enum::NonZero);
+
+    let two = Enum::from_primitive(2_u8);
+    assert_eq!(two, Enum::NonZero);
+}
+
+#[test]
+fn has_from_primitive_number_standard_default_attribute() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u8)]
+    enum Enum {
+        Zero = 0,
+        #[default]
+        NonZero = 1,
+    }
+
+    let zero = Enum::from_primitive(0_u8);
+    assert_eq!(zero, Enum::Zero);
+
+    let one = Enum::from_primitive(1_u8);
+    assert_eq!(one, Enum::NonZero);
+
+    let two = Enum::from_primitive(2_u8);
+    assert_eq!(two, Enum::NonZero);
+}
+
+#[test]
+fn from_primitive_number() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u8)]
+    enum Enum {
+        #[num_enum(default)]
+        Whatever = 0,
+    }
+
+    // #[derive(FromPrimitive)] generates implementations for the following traits:
+    //
+    // - `FromPrimitive<T>`
+    // - `From<T>`
+    // - `TryFromPrimitive<T>`
+    // - `TryFrom<T>`
+    let from_primitive = Enum::from_primitive(0_u8);
+    assert_eq!(from_primitive, Enum::Whatever);
+
+    let from = Enum::from(0_u8);
+    assert_eq!(from, Enum::Whatever);
+
+    let try_from_primitive = Enum::try_from_primitive(0_u8);
+    assert_eq!(try_from_primitive, Ok(Enum::Whatever));
+
+    let try_from = Enum::try_from(0_u8);
+    assert_eq!(try_from, Ok(Enum::Whatever));
+}
+
+#[test]
+fn from_primitive_number_catch_all() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u8)]
+    enum Enum {
+        Zero = 0,
+        #[num_enum(catch_all)]
+        NonZero(u8),
+    }
+
+    let zero = Enum::from_primitive(0_u8);
+    assert_eq!(zero, Enum::Zero);
+
+    let one = Enum::from_primitive(1_u8);
+    assert_eq!(one, Enum::NonZero(1_u8));
+
+    let two = Enum::from_primitive(2_u8);
+    assert_eq!(two, Enum::NonZero(2_u8));
+}
+
+#[cfg(feature = "complex-expressions")]
+#[test]
+fn from_primitive_number_with_inclusive_range() {
+    #[derive(Debug, Eq, PartialEq, FromPrimitive)]
+    #[repr(u8)]
+    enum Enum {
+        Zero = 0,
+        #[num_enum(alternatives = [2..=255])]
+        NonZero,
+    }
+
+    let zero = Enum::from_primitive(0_u8);
+    assert_eq!(zero, Enum::Zero);
+
+    let one = Enum::from_primitive(1_u8);
+    assert_eq!(one, Enum::NonZero);
+
+    let two = Enum::from_primitive(2_u8);
+    assert_eq!(two, Enum::NonZero);
+
+    let three = Enum::from_primitive(3_u8);
+    assert_eq!(three, Enum::NonZero);
+
+    let twofivefive = Enum::from_primitive(255_u8);
+    assert_eq!(twofivefive, Enum::NonZero);
+}