Concurrency

tests/evaluator/expansion_test.d

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+/// Unit tests for variable expansion in the evaluator.
+///
+/// Tests recursive expansion, simple vs recursive assignment semantics,
+/// and circular reference detection.
+module antelope.tests.evaluator.expansion_test;
+
+import antelope.evaluator.expansion;
+import antelope.shell.environment;
+
+/// Test simple variable reference expansion.
+unittest
+{
+    auto env = Environment.init;
+    env.set("CC", "gcc");
+    env.set("CFLAGS", "-Wall -O2");
+
+    auto result = expand(env, "$(CC) $(CFLAGS)");
+    assert(result == "gcc -Wall -O2");
+}
+
+/// Test brace-delimited variable expansion.
+unittest
+{
+    auto env = Environment.init;
+    env.set("VAR", "value");
+
+    auto result = expand(env, "${VAR}");
+    assert(result == "value");
+}
+
+/// Test that undefined variables produce a warning but expand to empty.
+unittest
+{
+    auto env = Environment.init;
+    auto result = expand(env, "$(UNDEFINED)");
+    assert(result == "");
+}