test: make the prevent-circular example an integration test

3 files changed, 94 insertions, 56 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 77b73c2..d33742b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,10 +35,6 @@ required-features = ["async", "factory"]
 name = "async-factory"
 required-features = ["async", "factory"]
 
-[[example]]
-name = "prevent-circular"
-required-features = ["prevent-circular"]
-
 [dependencies]
 syrette_macros = { path = "./macros", version = "0.4.2" }
 linkme = "0.3.0"
diff --git a/examples/prevent-circular/main.rs b/examples/prevent-circular/main.rs
deleted file mode 100644
index c690a9c..0000000
--- a/examples/prevent-circular/main.rs
+++ /dev/null
@@ -1,52 +0,0 @@
-//! Example demonstrating the prevention of circular dependencies.
-//!
-//! Having circular dependencies is generally bad practice and is detected by Syrette when
-//! the `prevent-circular` feature is enabled.
-#![deny(clippy::all)]
-#![deny(clippy::pedantic)]
-#![allow(clippy::disallowed_names)]
-
-use syrette::di_container::blocking::prelude::*;
-use syrette::injectable;
-use syrette::ptr::TransientPtr;
-
-struct Foo
-{
-    _bar: TransientPtr<Bar>,
-}
-
-#[injectable]
-impl Foo
-{
-    fn new(bar: TransientPtr<Bar>) -> Self
-    {
-        Self { _bar: bar }
-    }
-}
-
-struct Bar
-{
-    _foo: TransientPtr<Foo>,
-}
-
-#[injectable]
-impl Bar
-{
-    fn new(foo: TransientPtr<Foo>) -> Self
-    {
-        Self { _foo: foo }
-    }
-}
-
-fn main() -> Result<(), anyhow::Error>
-{
-    let mut di_container = DIContainer::new();
-
-    di_container.bind::<Foo>().to::<Foo>()?;
-    di_container.bind::<Bar>().to::<Bar>()?;
-
-    // The following won't work. Err will be returned.
-    let _foo = di_container.get::<Foo>()?.transient()?;
-
-    Ok(())
-}
diff --git a/tests/prevent_circular.rs b/tests/prevent_circular.rs
new file mode 100644
index 0000000..4b95dea
--- /dev/null
+++ b/tests/prevent_circular.rs
@@ -0,0 +1,94 @@
+#![deny(clippy::all, clippy::pedantic)]
+#![allow(clippy::disallowed_names)]
+
+use syrette::di_container::blocking::prelude::*;
+use syrette::errors::di_container::DIContainerError;
+use syrette::errors::injectable::InjectableError;
+use syrette::injectable;
+use syrette::ptr::TransientPtr;
+
+#[derive(Debug)]
+struct Foo
+{
+    _bar: TransientPtr<Bar>,
+}
+
+#[injectable]
+impl Foo
+{
+    fn new(bar: TransientPtr<Bar>) -> Self
+    {
+        Self { _bar: bar }
+    }
+}
+
+#[derive(Debug)]
+struct Bar
+{
+    _foo: TransientPtr<Foo>,
+}
+
+#[injectable]
+impl Bar
+{
+    fn new(foo: TransientPtr<Foo>) -> Self
+    {
+        Self { _foo: foo }
+    }
+}
+
+macro_rules! assert_match {
+    ($target: expr, $pattern: pat => $expr: expr) => {{
+        let target = $target;
+
+        // Not all pattern variables will be used here
+        #[allow(unused_variables)]
+        {
+            assert!(matches!(&target, $pattern));
+        }
+
+        match target {
+            $pattern => $expr,
+            _ => {
+                unreachable!();
+            }
+        }
+    }};
+}
+
+#[test]
+fn prevent_circular_works()
+{
+    let mut di_container = DIContainer::new();
+
+    di_container.bind::<Foo>().to::<Foo>().expect("Expected Ok");
+    di_container.bind::<Bar>().to::<Bar>().expect("Expected Ok");
+
+    let err = di_container.get::<Foo>().expect_err("Expected Err");
+
+    let container_err_a = assert_match!(
+        err,
+        DIContainerError::BindingResolveFailed {
+            reason: InjectableError::ResolveFailed { reason, affected: _ },
+            interface: _
+        } => *reason
+    );
+
+    let container_err_b = assert_match!(
+        container_err_a,
+        DIContainerError::BindingResolveFailed {
+            reason: InjectableError::ResolveFailed { reason, affected: _ },
+            interface: _
+        } => *reason
+    );
+
+    assert!(matches!(
+        container_err_b,
+        DIContainerError::BindingResolveFailed {
+            reason: InjectableError::DetectedCircular {
+                dependency_history: _
+            },
+            interface: _
+        }
+    ));
+}