1 files changed, 88 insertions, 0 deletions
diff --git a/linkify/001trace.test.cc b/linkify/001trace.test.cc
new file mode 100644
index 00000000..5f0a696e
--- /dev/null
+++ b/linkify/001trace.test.cc
@@ -0,0 +1,88 @@
+void test_trace_check_compares() {
+  CHECK_TRACE_CONTENTS("test layer", "");
+  trace("test layer") << "foo";
+  CHECK_TRACE_CONTENTS("test layer", "foo");
+}
+
+void test_trace_check_filters_layers() {
+  trace("test layer 1") << "foo";
+  trace("test layer 2") << "bar";
+  CHECK_TRACE_CONTENTS("test layer 1", "foo");
+}
+
+void test_trace_check_ignores_other_lines() {
+  trace("test layer 1") << "foo";
+  trace("test layer 1") << "bar";
+  CHECK_TRACE_CONTENTS("test layer 1", "foo");
+}
+
+void test_trace_check_always_finds_empty_lines() {
+  CHECK_TRACE_CONTENTS("test layer 1", "");
+}
+
+void test_trace_check_treats_empty_layers_as_wildcards() {
+  trace("test layer 1") << "foo";
+  CHECK_TRACE_CONTENTS("", "foo");
+}
+
+void test_trace_check_multiple_lines_at_once() {
+  trace("test layer 1") << "foo";
+  trace("test layer 2") << "bar";
+  CHECK_TRACE_CONTENTS("", "foobar");
+}
+
+void test_trace_check_always_finds_empty_lines2() {
+  CHECK_TRACE_CONTENTS("test layer 1", "");
+}
+
+void test_trace_orders_across_layers() {
+  trace("test layer 1") << "foo";
+  trace("test layer 2") << "bar";
+  trace("test layer 1") << "qux";
+  CHECK_TRACE_CONTENTS("", "foobarqux");
+}
+
+void test_trace_supports_count() {
+  trace("test layer 1") << "foo";
+  trace("test layer 1") << "foo";
+  CHECK_EQ(trace_count("test layer 1", "foo"), 2);
+}
+
+//// helpers
+
+// can't check trace because trace methods call 'split'
+
+void test_split_returns_at_least_one_elem() {
+  vector<string> result = split("", ",");
+  CHECK_EQ(result.size(), 1);
+  CHECK_EQ(result[0], "");
+}
+
+void test_split_returns_entire_input_when_no_delim() {
+  vector<string> result = split("abc", ",");
+  CHECK_EQ(result.size(), 1);
+  CHECK_EQ(result[0], "abc");
+}
+
+void test_split_works() {
+  vector<string> result = split("abc,def", ",");
+  CHECK_EQ(result.size(), 2);
+  CHECK_EQ(result[0], "abc");
+  CHECK_EQ(result[1], "def");
+}
+
+void test_split_works2() {
+  vector<string> result = split("abc,def,ghi", ",");
+  CHECK_EQ(result.size(), 3);
+  CHECK_EQ(result[0], "abc");
+  CHECK_EQ(result[1], "def");
+  CHECK_EQ(result[2], "ghi");
+}
+
+void test_split_handles_multichar_delim() {
+  vector<string> result = split("abc,,def,,ghi", ",,");
+  CHECK_EQ(result.size(), 3);
+  CHECK_EQ(result[0], "abc");
+  CHECK_EQ(result[1], "def");
+  CHECK_EQ(result[2], "ghi");
+}