add a simple test for prepare_report.

TODO: it is _too_ simple.

src/reports.c

@@ -1388,7 +1388,7 @@ static void cb_add_seen(region *r, unit *u, void *cbdata) {
  * this function may also update ctx->last and ctx->first for potential 
  * lighthouses and travelthru reports
  */
-static void prepare_report(report_context *ctx, faction *f)
+void prepare_report(report_context *ctx, faction *f)
 {
     region *r;
     building *b;
@@ -1454,7 +1454,7 @@ static void prepare_report(report_context *ctx, faction *f)
     ctx->last = lastregion(f);
 }
 
-static void finish_reports(report_context *ctx) {
+void finish_reports(report_context *ctx) {
     region *r;
     ql_free(ctx->addresses);
     for (r = ctx->first; r != ctx->last; r = r->next) {

src/reports.h

@@ -74,7 +74,8 @@ extern "C" {
         time_t report_time;
     } report_context;
 
-    void prepare_seen(struct report_context *ctx);
+    void prepare_report(report_context *ctx, struct faction *f);
+    void finish_reports(report_context *ctx);
 
     typedef int(*report_fun) (const char *filename, report_context * ctx,
         const char *charset);

src/reports.test.c

@@ -222,9 +222,37 @@ static void test_arg_resources(CuTest *tc) {
     test_cleanup();
 }
 
+static void test_prepare_report(CuTest *tc) {
+    report_context ctx;
+    faction *f;
+    region *r;
+    unit *u;
+
+    test_setup();
+    f = test_create_faction(0);
+    r = test_create_region(0, 0, 0);
+
+    prepare_report(&ctx, f);
+    CuAssertPtrEquals(tc, 0, ctx.first);
+    CuAssertPtrEquals(tc, 0, ctx.last);
+    CuAssertIntEquals(tc, seen_none, r->seen.mode);
+    finish_reports(&ctx);
+
+    u = test_create_unit(f, r);
+    prepare_report(&ctx, f);
+    CuAssertPtrEquals(tc, r, ctx.first);
+    CuAssertPtrEquals(tc, 0, ctx.last);
+    CuAssertIntEquals(tc, seen_unit, r->seen.mode);
+    finish_reports(&ctx);
+    CuAssertIntEquals(tc, seen_none, r->seen.mode);
+
+    test_cleanup();
+}
+
 CuSuite *get_reports_suite(void)
 {
     CuSuite *suite = CuSuiteNew();
+    SUITE_ADD_TEST(suite, test_prepare_report);
     SUITE_ADD_TEST(suite, test_reorder_units);
     SUITE_ADD_TEST(suite, test_seen_faction);
     SUITE_ADD_TEST(suite, test_regionid);