Introduce framework for running basic tests for entities (#1344)

* Introduce framework for running basic tests for entities

* Add pipeline tests to CircleCI config

* Make pipeline tests more configurable and fix CircleCI config

* Add coverage dir to pipeline package

* Add basic tests for all exchange event entities

* Add tests for remaining entities

* Create separate test scripts in package.json and add new info to README

* Update db_setup.ts to revert migrations even if you are using docker

* Automatically pull the postgres image if needed

* Add comment about why NumberToBigIntTransformer is needed

1 files changed, 5 insertions, 3 deletions

diff --git a/packages/pipeline/src/entities/token_metadata.ts b/packages/pipeline/src/entities/token_metadata.ts
index 4a0bceefe..ca1e57937 100644
--- a/packages/pipeline/src/entities/token_metadata.ts
+++ b/packages/pipeline/src/entities/token_metadata.ts
@@ -8,12 +8,14 @@ export class TokenMetadata {
     @PrimaryColumn({ type: 'varchar', nullable: false })
     public authority!: string;
 
+    // TODO(albrow): Convert decimals field to type BigNumber/numeric because it
+    // comes from a 256-bit integer in a smart contract.
     @Column({ type: 'integer', nullable: true })
-    public decimals!: number;
+    public decimals!: number | null;
 
     @Column({ type: 'varchar', nullable: true })
-    public symbol!: string;
+    public symbol!: string | null;
 
     @Column({ type: 'varchar', nullable: true })
-    public name!: string;
+    public name!: string | null;
 }