attr: Add missing header to test suite

tests-clar/attr/attr_expect.h

+#ifndef __CLAR_TEST_ATTR_EXPECT__
+#define __CLAR_TEST_ATTR_EXPECT__
+
+enum attr_expect_t {
+	EXPECT_FALSE,
+	EXPECT_TRUE,
+	EXPECT_UNDEFINED,
+	EXPECT_STRING
+};
+
+struct attr_expected {
+	const char *path;
+	const char *attr;
+	enum attr_expect_t expected;
+	const char *expected_str;
+};
+
+static inline void attr_check_expected(
+	enum attr_expect_t expected,
+	const char *expected_str,
+	const char *value)
+{
+	switch (expected) {
+	case EXPECT_TRUE:
+		cl_assert(GIT_ATTR_TRUE(value));
+		break;
+
+	case EXPECT_FALSE:
+		cl_assert(GIT_ATTR_FALSE(value));
+		break;
+
+	case EXPECT_UNDEFINED:
+		cl_assert(GIT_ATTR_UNSPECIFIED(value));
+		break;
+
+	case EXPECT_STRING:
+		cl_assert_strequal(expected_str, value);
+		break;
+	}
+}
+
+#endif