Rename spec -> test

'Test' is a lot more straightforward of a name.

test/compiler/rules/choice_test.cc

@@ -0,0 +1,53 @@
+#include "test_helper.h"
+#include "compiler/rules/choice.h"
+#include "helpers/rule_helpers.h"
+#include "helpers/equals_pointer.h"
+
+using namespace rules;
+
+START_TEST
+
+describe("Choice", []() {
+  describe("constructing choices", [&]() {
+    it("eliminates duplicate members", [&]() {
+      auto rule = Choice::build({
+        seq({ sym("one"), sym("two") }),
+        sym("three"),
+        seq({ sym("one"), sym("two") })
+      });
+
+      AssertThat(rule, EqualsPointer(choice({
+        seq({ sym("one"), sym("two") }),
+        sym("three"),
+      })));
+    });
+
+    it("eliminates duplicates within nested choices", [&]() {
+      auto rule = Choice::build({
+        seq({ sym("one"), sym("two") }),
+        Choice::build({
+          sym("three"),
+          seq({ sym("one"), sym("two") })
+        })
+      });
+
+      AssertThat(rule, EqualsPointer(choice({
+        seq({ sym("one"), sym("two") }),
+        sym("three"),
+      })));
+    });
+
+    it("doesn't construct a choice if there's only one unique member", [&]() {
+      auto rule = Choice::build({
+        sym("one"),
+        Choice::build({
+          sym("one"),
+        })
+      });
+
+      AssertThat(rule, EqualsPointer(sym("one")));
+    });
+  });
+});
+
+END_TEST