diff --git a/tests/integration/runners.py b/tests/integration/runners.py
index c1350ff..bb027f5 100644
--- a/tests/integration/runners.py
+++ b/tests/integration/runners.py
@@ -5,12 +5,10 @@ from typing import Any, Iterable, TextIO
 
 import ctypes
 import io
-import os
-import subprocess
-import tempfile
 
 import pywasm.binary
 import wasm3
+import wasmer
 import wasmtime
 
 from phasm.compiler import phasm_compile
@@ -18,31 +16,6 @@ from phasm.parser import phasm_parse
 from phasm import ourlang
 from phasm import wasm
 
-def wat2wasm(code_wat: str) -> bytes:
-    """
-    Converts the given WebAssembly Assembly code into WebAssembly Binary
-    """
-    path = os.environ.get('WAT2WASM', 'wat2wasm')
-
-    with tempfile.NamedTemporaryFile('w+t') as input_fp:
-        input_fp.write(code_wat)
-        input_fp.flush()
-
-        with tempfile.NamedTemporaryFile('w+b') as output_fp:
-            subprocess.run(
-                [
-                    path,
-                    input_fp.name,
-                    '-o',
-                    output_fp.name,
-                ],
-                check=True,
-            )
-
-            output_fp.seek(0)
-
-            return output_fp.read()
-
 class RunnerBase:
     """
     Base class
@@ -90,7 +63,7 @@ class RunnerBase:
         """
         Compiles the WebAssembly AST into WebAssembly Binary
         """
-        self.wasm_bin = wat2wasm(self.wasm_asm)
+        self.wasm_bin = wasmer.wat2wasm(self.wasm_asm)
 
     def interpreter_setup(self) -> None:
         """
@@ -253,6 +226,56 @@ class RunnerWasmtime(RunnerBase):
 
         return func(self.store, *args)
 
+class RunnerWasmer(RunnerBase):
+    """
+    Implements a runner for wasmer
+
+    See https://pypi.org/project/wasmer/
+    """
+
+    # pylint: disable=E1101
+
+    store: wasmer.Store
+    module: wasmer.Module
+    instance: wasmer.Instance
+
+    def interpreter_setup(self) -> None:
+        self.store = wasmer.Store()
+
+    def interpreter_load(self) -> None:
+        self.module = wasmer.Module(self.store, self.wasm_bin)
+        self.instance = wasmer.Instance(self.module)
+
+    def interpreter_write_memory(self, offset: int, data: Iterable[int]) -> None:
+        exports = self.instance.exports
+        memory = getattr(exports, 'memory')
+        assert isinstance(memory, wasmer.Memory)
+        view = memory.uint8_view(offset)
+
+        for idx, byt in enumerate(data):
+            view[idx] = byt
+
+    def interpreter_read_memory(self, offset: int, length: int) -> bytes:
+        exports = self.instance.exports
+        memory = getattr(exports, 'memory')
+        assert isinstance(memory, wasmer.Memory)
+        view = memory.uint8_view(offset)
+        return bytes(view[offset:length])
+
+    def interpreter_dump_memory(self, textio: TextIO) -> None:
+        exports = self.instance.exports
+        memory = getattr(exports, 'memory')
+        assert isinstance(memory, wasmer.Memory)
+        view = memory.uint8_view()
+
+        _dump_memory(textio, view) # type: ignore
+
+    def call(self, function: str, *args: Any) -> Any:
+        exports = self.instance.exports
+        func = getattr(exports, function)
+
+        return func(*args)
+
 def _dump_memory(textio: TextIO, mem: bytes) -> None:
     line_width = 16