From bec73ca7a18f84c27c9e2af8b0720b54b8ef1b58 Mon Sep 17 00:00:00 2001
From: Michael McLoughlin <mmcloughlin@gmail.com>
Date: Sat, 24 Nov 2018 14:08:55 -0800
Subject: [PATCH] basic instruction properties

---
 internal/inst/inst_test.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 internal/inst/inst_test.go

diff --git a/internal/inst/inst_test.go b/internal/inst/inst_test.go
new file mode 100644
index 0000000..75a8f00
--- /dev/null
+++ b/internal/inst/inst_test.go
@@ -0,0 +1,36 @@
+package inst
+
+import "testing"
+
+func TestHaveInstructions(t *testing.T) {
+	n := len(Instructions)
+	t.Logf("number of instructions = %d", n)
+	if n == 0 {
+		t.Fatalf("no instructions")
+	}
+}
+
+func TestOpcodeDupes(t *testing.T) {
+	count := map[string]int{}
+	for _, i := range Instructions {
+		count[i.Opcode]++
+	}
+
+	for opcode, n := range count {
+		if n > 1 {
+			t.Errorf("opcode %s appears %d times", opcode, n)
+		}
+	}
+}
+
+func TestInstructionProperties(t *testing.T) {
+	for _, i := range Instructions {
+		if len(i.Opcode) == 0 {
+			t.Errorf("empty opcode")
+		}
+		if len(i.Forms) == 0 {
+			t.Errorf("instruction %s has no forms", i.Opcode)
+		}
+	}
+
+}