diff --git a/runtime/stdlib/contracts/test.cdc b/runtime/stdlib/contracts/test.cdc
index c303ae0422..83c0d3cdc2 100644
--- a/runtime/stdlib/contracts/test.cdc
+++ b/runtime/stdlib/contracts/test.cdc
@@ -504,4 +504,20 @@ access(all) contract Test {
     access(all)
     native fun beLessThan(_ value: Number): Test.Matcher {}
 
+    /// Read a local file, and return the content as a string.
+    ///
+    access(all)
+    native fun readFile(_ path: String): String {}
+
+    /// Fails the test-case if the given condition is false,
+    /// and reports a message which explains how the condition is false.
+    ///
+    access(all)
+    native fun assert(_ condition: Bool, message: String): Void {}
+
+    /// Fails the test-case with a message.
+    ///
+    access(all)
+    native fun fail(message: String): Void {}
+
 }
diff --git a/runtime/stdlib/test_test.go b/runtime/stdlib/test_test.go
index 8ae63d78dc..6772ec871e 100644
--- a/runtime/stdlib/test_test.go
+++ b/runtime/stdlib/test_test.go
@@ -664,6 +664,74 @@ func TestTestEqualMatcher(t *testing.T) {
 	})
 }
 
+func TestAssertFunction(t *testing.T) {
+	t.Parallel()
+
+	const script = `
+        import Test
+
+        pub fun testAssertWithNoArgs() {
+            Test.assert(true)
+        }
+
+        pub fun testAssertWithNoArgsFail() {
+            Test.assert(false)
+        }
+
+        pub fun testAssertWithMessage() {
+            Test.assert(true, message: "some reason")
+        }
+
+        pub fun testAssertWithMessageFail() {
+            Test.assert(false, message: "some reason")
+        }
+	`
+
+	inter, err := newTestContractInterpreter(t, script)
+	require.NoError(t, err)
+
+	_, err = inter.Invoke("testAssertWithNoArgs")
+	require.NoError(t, err)
+
+	_, err = inter.Invoke("testAssertWithNoArgsFail")
+	require.Error(t, err)
+	assert.ErrorContains(t, err, "assertion failed")
+
+	_, err = inter.Invoke("testAssertWithMessage")
+	require.NoError(t, err)
+
+	_, err = inter.Invoke("testAssertWithMessageFail")
+	require.Error(t, err)
+	require.ErrorContains(t, err, "assertion failed: some reason")
+}
+
+func TestFailFunction(t *testing.T) {
+	t.Parallel()
+
+	const script = `
+        import Test
+
+        pub fun testFailWithoutMessage() {
+            Test.fail()
+        }
+
+        pub fun testFailWithMessage() {
+            Test.fail(message: "some error")
+        }
+	`
+
+	inter, err := newTestContractInterpreter(t, script)
+	require.NoError(t, err)
+
+	_, err = inter.Invoke("testFailWithoutMessage")
+	require.Error(t, err)
+	require.ErrorContains(t, err, "assertion failed")
+
+	_, err = inter.Invoke("testFailWithMessage")
+	require.Error(t, err)
+	require.ErrorContains(t, err, "assertion failed: some error")
+}
+
 func TestAssertEqual(t *testing.T) {
 
 	t.Parallel()
@@ -2649,6 +2717,77 @@ func TestBlockchain(t *testing.T) {
 		assert.True(t, getAccountInvoked)
 	})
 
+	t.Run("readFile", func(t *testing.T) {
+		t.Parallel()
+
+		const script = `
+            import Test
+
+            pub fun test() {
+                let content = Test.readFile("some_file.cdc")
+                Test.assertEqual("Hey there!", content)
+            }
+		`
+
+		readFileInvoked := false
+
+		testFramework := &mockedTestFramework{
+			emulatorBackend: func() stdlib.Blockchain {
+				return &mockedBlockchain{}
+			},
+			readFile: func(path string) (string, error) {
+				readFileInvoked = true
+				assert.Equal(t, "some_file.cdc", path)
+
+				return "Hey there!", nil
+			},
+		}
+
+		inter, err := newTestContractInterpreterWithTestFramework(t, script, testFramework)
+		require.NoError(t, err)
+
+		_, err = inter.Invoke("test")
+		require.NoError(t, err)
+
+		assert.True(t, readFileInvoked)
+	})
+
+	t.Run("readFile with failure", func(t *testing.T) {
+		t.Parallel()
+
+		const script = `
+            import Test
+
+            pub fun test() {
+                let content = Test.readFile("some_file.cdc")
+                Test.assertEqual("Hey there!", content)
+            }
+		`
+
+		readFileInvoked := false
+
+		testFramework := &mockedTestFramework{
+			emulatorBackend: func() stdlib.Blockchain {
+				return &mockedBlockchain{}
+			},
+			readFile: func(path string) (string, error) {
+				readFileInvoked = true
+				assert.Equal(t, "some_file.cdc", path)
+
+				return "", fmt.Errorf("could not read file: %s", path)
+			},
+		}
+
+		inter, err := newTestContractInterpreterWithTestFramework(t, script, testFramework)
+		require.NoError(t, err)
+
+		_, err = inter.Invoke("test")
+		require.Error(t, err)
+		assert.ErrorContains(t, err, "could not read file: some_file.cdc")
+
+		assert.True(t, readFileInvoked)
+	})
+
 	// TODO: Add more tests for the remaining functions.
 }