Create a unit7 for all unit tests.

test/unit7/stdlib/collections/ringbuffer.c3

@@ -0,0 +1,29 @@
+module ringbuffer_test @test;
+import std::collections::ringbuffer;
+import std::io;
+
+def Buffer = RingBuffer{char[4]};
+
+fn void push_get()
+{
+	Buffer rb;
+	rb.init();
+	rb.push(1);
+	rb.push(2);
+	rb.push(3);
+	rb.push(4);
+
+	assert(rb.get(0) == 1);
+	assert(rb.get(1) == 2);
+	assert(rb.get(2) == 3);
+	assert(rb.get(3) == 4);
+
+	rb.push(5);
+	assert(rb.get(0) == 2);
+	assert(rb.get(1) == 3);
+	assert(rb.get(2) == 4);
+	assert(rb.get(3) == 5);
+
+	char c = rb.pop()!!;
+	assert(c == 5);
+}