test: Add crate-level integration tests

Add a sample `Conanfile.txt` and run the `conan install` command
using the public crate API.
Check that the JSON-formatted Conan output is parsed successfully.

Test the Conan command failure handling code in two separate test cases.

.github/workflows/rust.yml

@@ -17,6 +17,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Build
       run: cargo build --verbose
+    - name: Install Conan
+      run: pip install conan
     - name: Run tests
       run: cargo test --verbose
   fmt:

tests/conanfile.txt

@@ -0,0 +1,3 @@
+[requires]
+libxml2/2.11.4
+zlib/1.3

tests/integration_test.rs

@@ -0,0 +1,48 @@
+//! conan2-rs integration tests
+
+use std::path::Path;
+
+use conan2::ConanInstall;
+
+#[test]
+fn run_conan_install() {
+    let output = ConanInstall::with_recipe(Path::new("tests/conanfile.txt"))
+        .output_folder(Path::new(env!("CARGO_TARGET_TMPDIR")))
+        .build("missing")
+        .run();
+
+    assert!(output.is_success());
+    assert_eq!(output.status_code(), 0);
+
+    output.parse().emit();
+}
+
+#[test]
+fn fail_no_conanfile() {
+    let output = ConanInstall::new()
+        .output_folder(Path::new(env!("CARGO_TARGET_TMPDIR")))
+        .run();
+
+    assert!(!output.is_success());
+    assert_eq!(output.status_code(), 1);
+    assert_eq!(output.stdout().len(), 0);
+    assert!(output
+        .stderr()
+        .starts_with(b"ERROR: Conanfile not found at"));
+}
+
+#[test]
+fn fail_no_profile() {
+    let output = ConanInstall::with_recipe(Path::new("tests/conanfile.txt"))
+        .output_folder(Path::new(env!("CARGO_TARGET_TMPDIR")))
+        .profile("no-such-profile")
+        .run();
+
+    assert!(!output.is_success());
+    assert_eq!(output.status_code(), 1);
+    assert_eq!(output.stdout().len(), 0);
+    assert_eq!(
+        output.stderr(),
+        b"ERROR: Profile not found: no-such-profile\n"
+    );
+}