Add very simple tests

Author: filmor

example/example.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp30;netstandard20</TargetFrameworks>
+    <TargetFrameworks>netcoreapp31;netstandard20</TargetFrameworks>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
   </PropertyGroup>
 </Project>

tests/test_common.py

@@ -0,0 +1,40 @@
+import pytest
+from subprocess import check_call
+import os
+from cffi import FFI
+NULL = FFI().NULL
+
+@pytest.fixture(scope="session")
+def example_dll(tmpdir_factory):
+    out = str(tmpdir_factory.mktemp("example"))
+    proj_path = os.path.join(os.path.dirname(__file__), "../example")
+
+    check_call(["dotnet", "build", proj_path, "-o", out, "-f", "netcoreapp31"])
+
+    return out
+
+
+def test_mono(example_dll):
+    from clr_loader import get_mono
+
+    mono = get_mono()
+    asm = mono.get_assembly(os.path.join(example_dll, "example.dll"))
+
+    run_tests(asm)
+
+
+def test_coreclr(example_dll):
+    from clr_loader import get_coreclr
+
+    coreclr = get_coreclr(os.path.join(example_dll, "example.runtimeconfig.json"))
+    asm = coreclr.get_assembly(os.path.join(example_dll, "example.dll"))
+
+    run_tests(asm)
+
+
+def run_tests(asm):
+    func = asm.get_function("Example.TestClass", "Test")
+    test_data = b"testy mctestface"
+    res = func(test_data)
+    assert res == len(test_data)
+