Move all SWF tests out of `core` to new `tests` package

This allows `regressions_tests.rs` to depend on other crates in the
workspace, such as `render`, without introducing a cyclic dependency.

Split out from #4054

Cargo.lock

@@ -963,6 +963,12 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
 
+[[package]]
+name = "difference"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+
 [[package]]
 name = "dirs"
 version = "3.0.2"
@@ -2605,6 +2611,18 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
 
+[[package]]
+name = "pretty_assertions"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
+dependencies = [
+ "ansi_term 0.11.0",
+ "ctor",
+ "difference",
+ "output_vt100",
+]
+
 [[package]]
 name = "pretty_assertions"
 version = "0.7.2"
@@ -2881,7 +2899,7 @@ dependencies = [
  "num_enum 0.5.1",
  "percent-encoding",
  "png",
- "pretty_assertions",
+ "pretty_assertions 0.7.2",
  "quick-xml",
  "rand",
  "regress",
@@ -3386,6 +3404,16 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "tests"
+version = "0.1.0"
+dependencies = [
+ "approx",
+ "env_logger",
+ "pretty_assertions 0.6.1",
+ "ruffle_core",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"

Cargo.toml

@@ -12,6 +12,8 @@ members = [
     "render/wgpu",
     "render/common_tess",
     "render/webgl",
+
+    "tests",
 ]
 resolver = "2"
 

tests/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "tests"
+version = "0.1.0"
+authors = ["Aaron Hill <aa1ronham@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ruffle_core = { path = "../core" }
+
+[dev-dependencies]
+approx = "0.4.0"
+pretty_assertions = "0.6.1"
+env_logger = "0.8.3"