add test cases for eq_union

tests/eq_enum.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 #[macro_use]
 extern crate educe;
 

tests/eq_struct.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 #[macro_use]
 extern crate educe;
 

tests/eq_union.rs

@@ -0,0 +1,68 @@
+#![no_std]
+
+#[macro_use]
+extern crate educe;
+
+#[test]
+#[allow(dead_code)]
+fn basic() {
+    #[derive(Educe)]
+    #[educe(Eq)]
+    union Union {
+        f1: u8
+    }
+
+    impl core::cmp::PartialEq for Union {
+        fn eq(&self, _other: &Union) -> bool {
+            true
+        }
+    }
+}
+
+#[test]
+#[allow(dead_code)]
+fn bound_1() {
+    #[derive(Educe)]
+    #[educe(Eq(bound))]
+    union Union<T: Copy> {
+        f1: T
+    }
+
+    impl<T: Copy> core::cmp::PartialEq for Union<T> {
+        fn eq(&self, _other: &Union<T>) -> bool {
+            true
+        }
+    }
+}
+
+#[test]
+#[allow(dead_code)]
+fn bound_2() {
+    #[derive(Educe)]
+    #[educe(Eq(bound = "T: core::cmp::Eq"))]
+    union Union<T: Copy> {
+        f1: T
+    }
+
+    impl<T: Copy> core::cmp::PartialEq for Union<T> {
+        fn eq(&self, _other: &Union<T>) -> bool {
+            true
+        }
+    }
+}
+
+#[test]
+#[allow(dead_code)]
+fn bound_3() {
+    #[derive(Educe)]
+    #[educe(Eq(bound = "T: core::cmp::PartialEq"))]
+    union Union<T: Copy> {
+        f1: T
+    }
+
+    impl<T: Copy> core::cmp::PartialEq for Union<T> {
+        fn eq(&self, _other: &Union<T>) -> bool {
+            true
+        }
+    }
+}

tests/partial_eq_enum.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 #[macro_use]
 extern crate educe;
 

tests/partial_eq_struct.rs

@@ -1,3 +1,5 @@
+#![no_std]
+
 #[macro_use]
 extern crate educe;