diff --git a/SnapTests/SnapTests.swift b/SnapTests/SnapTests.swift
index bebb1b7..5a82a13 100644
--- a/SnapTests/SnapTests.swift
+++ b/SnapTests/SnapTests.swift
@@ -35,11 +35,16 @@ class SnapTests: XCTestCase {
             make.left.equalTo(v2.snp_top).offset(50)
             return
         }
+        
+        XCTAssertEqual(self.container.constraints().count, 2, "Should have 2 constraints installed")
+        
         v2.snp_makeConstraints { (make) -> Void in
             make.edges.equalTo(v1)
             return
         }
         
+        XCTAssertEqual(self.container.constraints().count, 6, "Should have 6 constraints installed")
+        
     }
     
     func testUpdateConstraints() {
@@ -53,11 +58,16 @@ class SnapTests: XCTestCase {
             make.left.equalTo(v2.snp_top).offset(50)
             return
         }
+        
+        XCTAssertEqual(self.container.constraints().count, 2, "Should have 2 constraints installed")
+        
         v1.snp_updateConstraints { (make) -> Void in
             make.top.equalTo(v2.snp_top).offset(15)
             return
         }
         
+        XCTAssertEqual(self.container.constraints().count, 2, "Should still have 2 constraints installed")
+        
     }
     
     func testRemakeConstraints() {
@@ -71,11 +81,16 @@ class SnapTests: XCTestCase {
             make.left.equalTo(v2.snp_top).offset(50)
             return
         }
+        
+        XCTAssertEqual(self.container.constraints().count, 2, "Should have 2 constraints installed")
+        
         v1.snp_remakeConstraints { (make) -> Void in
             make.edges.equalTo(v2)
             return
         }
         
+        XCTAssertEqual(self.container.constraints().count, 4, "Should have 4 constraints installed")
+        
     }
     
     func testRemoveConstraints() {
@@ -89,8 +104,40 @@ class SnapTests: XCTestCase {
             make.left.equalTo(v2.snp_top).offset(50)
             return
         }
+        
+        XCTAssertEqual(self.container.constraints().count, 2, "Should have 2 constraints installed")
+        
         v1.snp_removeConstraints()
         
+        XCTAssertEqual(self.container.constraints().count, 0, "Should have 0 constraints installed")
+        
+    }
+    
+    func testPrepareConstraints() {
+        let v1 = UIView()
+        let v2 = UIView()
+        self.container.addSubview(v1)
+        self.container.addSubview(v2)
+        
+        let constraints = v1.snp_prepareConstraints { (make) -> Void in
+            make.edges.equalTo(v2)
+            return
+        }
+        
+        XCTAssertEqual(self.container.constraints().count, 0, "Should have 0 constraints installed")
+        
+        for constraint in constraints {
+            constraint.install()
+        }
+        
+        XCTAssertEqual(self.container.constraints().count, 4, "Should have 4 constraints installed")
+        
+        for constraint in constraints {
+            constraint.uninstall()
+        }
+        
+        XCTAssertEqual(self.container.constraints().count, 0, "Should have 0 constraints installed")
+        
     }
     
 }