diff --git a/tests/tests.py b/tests/tests.py
index 4822a3c..c73a8b2 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -40,9 +40,10 @@ def execute_tests():
 			if output != result:
 				failed_tests += 1
 				printf("Failed in {}. {} was {}, should be {}",
-						name, register, result, output)
+						name, register, output, result)
 		except BaseException as e:
-			if not isinstance(e, result):
+			print(e)
+			if not isinstance(result, BaseException) or not isinstance(e, result):
 				error_tests += 1
 				printf("Encountered error in {}, at operation {}: {}",
 						name, emu.getVal('%rip'), e)
@@ -53,6 +54,7 @@ def execute_tests():
 		failed_tests, error_tests)
 
 ################################################################################
+# Arithmetic Operations
 
 add_test("constant $255", 255, "%rsi", """
 movq $255, %rsi
@@ -69,7 +71,36 @@ movq $20, %rax
 addq %rax, %rsi
 """)
 
+add_test("register subtraction 10-20", -10, "%rsi", """
+movq $10, %rsi
+movq $20, %rax
+subq %rax, %rsi
+""")
+
 ################################################################################
+# Branching
+
+branch_tests = [
+	("jg",10,">",5,0), ("jg",5,">",5,1), ("jg",5,">",10,1),
+	("jl",10,"<",5,1), ("jl",5,"<",5,1), ("jl",5,"<",10,0),
+	("je",10,"==",5,1),("je",5,"==",5,0),("je",5,"==",10,1),
+	("jge",10,">=",5,0),("jge",5,">=",5,0),("jge",5,">=",10,1),
+	("jle",10,"<=",5,1),("jle",5,"<=",5,0),("jle",5,"<=",10,0),
+	("jne",10,"!=",5,0),("jne",5,"!=",5,1),("jne",5,"!=",10,0),
+]
+
+for jump_instruct, a, comp, b, result in branch_tests:
+	add_test("branch {a} {comp} {b}={result}".format(a=a,comp=comp,b=b,result=not result), result, "%rsi", """
+	start:	cmpq ${b}, ${a}
+			{jump_instruct} true
+			movq $1, %rsi
+			jmp return
+	true:	movq $0, %rsi
+	return:	ret
+	""".format(a=a,b=b,jump_instruct=jump_instruct))
+
+################################################################################
+# Junk Comparisons
 
 add_test("invalid comparison 1", infernal.JunkComparisonException, "None", """
 start:	movq $100, %rsp   # Set stack pointer to a random position.