[IN] Support for mocking interfaces (#1)

Author: matgla

.github/workflows/unit_tests.yml

@@ -0,0 +1,22 @@
+name: oop.zig Unit Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  execute_unit_tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+      - name: Execute tests
+        shell: bash
+        run: |
+          curl https://raw.githubusercontent.com/tristanisham/zvm/master/install.sh | bash
+          export PATH="$HOME/.zvm/bin:$HOME/.zvm/self:$PATH"
+          ./install_zig_with_zvm.sh
+          zig build test --summary all

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug Tests",
+            "type": "lldb",
+            "request": "launch",
+            "program": "${workspaceFolder}/zig-out/bin/test",
+            "cwd": "${workspaceRoot}",
+        }
+    ]
+}

build.zig

@@ -20,6 +20,7 @@ pub fn build(b: *std.Build) !void {
 
     const exe_tests = b.addTest(.{
         .root_module = mod_tests,
+        .use_llvm = true,
     });
     exe_tests.root_module.addImport("interface", mod);
 
@@ -28,6 +29,8 @@ pub fn build(b: *std.Build) !void {
     const test_step = b.step("test", "Run tests");
     test_step.dependOn(&run_exe_tests.step);
 
+    b.installArtifact(exe_tests);
+
     if (enable_examples) {
         var iterable_dir = try std.fs.cwd().openDir("examples", .{ .iterate = true });
         defer iterable_dir.close();

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .oop_zig,
     .version = "0.0.1",
     .fingerprint = 0x4d0368551b1ab249, // Changing this has security and trust implications.
-    .minimum_zig_version = "0.16.0-dev.233+a0ec4e270",
+    .minimum_zig_version = "0.15.2",
     .dependencies = .{},
     .paths = .{
         "build.zig",

install_zig_with_zvm.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+version=$(awk -F'"' '/\.minimum_zig_version/ { print $2 }' build.zig.zon)
+echo "Installing Zig version $version using zvm..."
+
+zvm install $version
+zvm use $version

src/interface.zig

@@ -298,16 +298,6 @@ pub fn DeriveFromBase(comptime BaseType: anytype, comptime Derived: type) type {
         if (!@hasField(Derived, "base") or !(@FieldType(Derived, "base") == BaseType)) {
             @compileError("Deriving from a base instead of an interface requires a 'base' field in the derived type.");
         }
-        // // disallow fields override
-        // var base: ?type = BaseType;
-        // while (base != null) {
-        //     for (std.meta.fields(Derived)) |field| {
-        //         if (@hasField(base.?, field.name) and !std.mem.eql(u8, field.name, "base")) {
-        //             @compileError("Field already exists in the base: " ++ field.name);
-        //         }
-        //     }
-        //     base = base.?.Base;
-        // }
     };
 
     return struct {
@@ -331,10 +321,6 @@ pub fn DeriveFromBase(comptime BaseType: anytype, comptime Derived: type) type {
         pub fn data(self: *Self) *Derived {
             return &self.__data;
         }
-
-        // pub fn __destructor(self: *Self) void {
-        //     self.interface.__destructor(self.interface);
-        // }
     };
 }