1 files changed, 114 insertions, 0 deletions
diff --git a/src/testing.c b/src/testing.c
new file mode 100644
index 0000000..028e48f
--- /dev/null
+++ b/src/testing.c
@@ -0,0 +1,114 @@
+#include "config.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "testing.h"
+
+
+#define COLOUR_RESET  "\033[0m"
+#define COLOUR_GREEN  "\033[0;32m"
+#define COLOUR_YELLOW "\033[0;33m"
+
+static const char *const
+ENVVAR_NAME = "NO_COLOR";
+
+
+static bool
+show_colour(void) {
+	const char *const no_colour = getenv(ENVVAR_NAME);
+	return !no_colour || no_colour[0] == '\0';
+}
+
+
+/**
+ * @tags infallible
+ */
+void
+test_start(const char *const name) {
+	(void)fprintf(stderr, "%s:\n", name);
+
+	return;
+}
+
+
+/**
+ * @tags infallible
+ */
+void
+testing(const char *const message) {
+	if (show_colour()) {
+		(void)fprintf(
+			stderr,
+			COLOUR_YELLOW "testing" COLOUR_RESET ": %s...",
+			message
+		);
+	} else {
+		(void)fprintf(
+			stderr,
+			"testing: %s...",
+			message
+		);
+	}
+
+	return;
+}
+
+
+/**
+ * @tags infallible
+ */
+void
+test_ok(void) {
+	if (show_colour()) {
+		(void)fprintf(stderr, " " COLOUR_GREEN "OK" COLOUR_RESET ".\n");
+	} else {
+		(void)fprintf(stderr, " OK.\n");
+	}
+
+	return;
+}
+
+#ifdef TEST
+int
+main(void) {
+	int rc = 0;
+
+	test_start("testing.c");
+	const int should_overwrite = 1;
+
+	if (unsetenv(ENVVAR_NAME)) {
+		perror("unsetenv(\"NO_COLOR\")");
+		rc = -1;
+		goto out;
+	}
+	{
+		testing("unset NO_COLOR");
+		test_ok();
+	}
+
+	if (setenv(ENVVAR_NAME, "", should_overwrite)) {
+		perror("setenv(\"NO_COLOR\", \"\", 1)");
+		rc = -1;
+		goto out;
+	}
+	{
+		testing("empty NO_COLOR");
+		test_ok();
+	}
+
+	if (setenv(ENVVAR_NAME, "something", should_overwrite)) {
+		perror("setenv(\"NO_COLOR\", \"something\", 1)");
+		rc = -1;
+		goto out;
+	}
+	{
+		testing("defined NO_COLOR");
+		test_ok();
+	}
+
+out:
+	return !!rc;
+}
+#endif