Add the exceptions tests. Addresses #215.

git-svn-id: file:///svn/tokudb@1329 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/tests/exceptions.cpp

+#include <assert.h>
+#include <db_cxx.h>
+#include <errno.h>
+
+#define TC(expr, expect) ({        \
+  try {                            \
+    expr;                          \
+    assert(expect==0); 	           \
+  } catch (DbException e) {        \
+    if (e.get_errno()!=expect) fprintf(stderr, "err=%d %s\n", e.get_errno(), db_strerror(e.get_errno())); \
+    assert(e.get_errno()==expect); \
+  }                                \
+})
+
+void test_env_exceptions (void) {
+    {
+	DbEnv env(0);
+	TC(env.open("no.such.dir", DB_INIT_MPOOL | DB_CREATE | DB_PRIVATE, 0777),        ENOENT);
+    }
+    {
+	DbEnv env(0);
+	TC(env.open("no.such.dir", -1, 0777),                                            EINVAL);
+    }
+    {
+	DbEnv env(0);
+	TC(env.open(".", DB_INIT_MPOOL | DB_CREATE | DB_PRIVATE, 0777),                  0);
+	DbTxn *txn;
+	TC(env.txn_begin(0, &txn, 0),                                                    EINVAL); // not configured for transations
+    }
+    {
+	DbEnv env(0);
+	TC(env.open(".", DB_INIT_MPOOL | DB_CREATE | DB_PRIVATE | DB_INIT_LOG, 0777),                  0);
+	DbTxn *txn;
+	TC(env.txn_begin(0, &txn, 0),                                                    0);
+	TC(txn->commit(0),                                                               0); 
+	delete txn;
+    }
+
+    {
+	DbEnv env(0);
+	TC(env.open(".", DB_INIT_MPOOL | DB_CREATE | DB_PRIVATE | DB_INIT_LOG, 0777),    0);
+	DbTxn *txn;
+	TC(env.txn_begin(0, &txn, 0),                                                    0);
+	TC(txn->commit(-1),                                                              EINVAL);
+	delete txn;
+    }
+}
+
+
+int main(int argc, char *argv[]) {
+    test_env_exceptions();
+    return 0;
+}